Kazano (alogliptin benzoate/metformin HCl)

Dosage of alogliptin benzoate is expressed in terms of alogliptin.

Available as metformin hydrochloride; dosage expressed in terms of the salt.

When administered as a single-entity preparation, alogliptin may be administered orally once daily without regard to meals. Alogliptin tablets should be swallowed whole and should not be split.

When alogliptin is administered in fixed combination with metformin hydrochloride, the combination should be administered twice daily with food; dosage should be titrated gradually to minimize adverse GI effects of the metformin component. Fixed-combination tablets should be swallowed whole and should not be split before swallowing.

When alogliptin is administered in fixed combination with pioglitazone, the combination should be administered once daily without regard to meals. Fixed-combination tablets should be swallowed whole and should not be split before swallowing.

If a dose of alogliptin alone or in combination with metformin or pioglitazone is missed, the missed dose should be taken as soon as it is remembered followed by resumption of the regular schedule. If the missed dose is not remembered until the time of the next dose, the missed dose should be skipped and the regular schedule resumed; the dose should not be doubled to replace a missed dose.

Alogliptin and its metformin- or pioglitazone-containing combination products should be stored at 25degreesC (excursions permitted to 15-30degreesC). Keep alogliptin/metformin hydrochloride fixed-combination tablets in a tightly closed container. Keep alogliptin/pioglitazone fixed-combination tablets in a tightly closed container and protect from moisture and humidity.

Metformin hydrochloride is administered orally. In patients receiving metformin hydrochloride immediate-release tablets at a dosage of 2 g or less daily, the medication can usually be given as 2 divided doses daily; however, in patients who require more than 2 g daily, the medication may be better tolerated if administered in 3 divided doses daily. Although food decreases the extent and slightly delays absorption of metformin immediate-release tablets, the manufacturer recommends that the medication be taken with meals to decrease adverse GI effects. Immediate-release metformin hydrochloride in fixed combination with alogliptin, canagliflozin, dapagliflozin, empagliflozin, ertugliflozin, linagliptin, pioglitazone, or sitagliptin is administered in divided doses daily with meals to reduce the GI effects of the metformin hydrochloride component. See the full prescribing information for additional administration instructions for the combination products.

Metformin hydrochloride oral solution is administered either once or twice daily with meals. Dosages above 2 g daily may be better tolerated if administered in 3 divided doses daily. Each dose should be measured using a metformin hydrochloride oral solution specific dosing cup.

Metformin hydrochloride extended-release tablets usually are taken with the evening meal. Extended-release metformin hydrochloride in fixed combination with canagliflozin, dapagliflozin, or empagliflozin is administered once daily with the morning meal. The fixed combination of extended-release metformin hydrochloride and linagliptin should be administered once daily with a meal. The fixed combination of extended-release metformin hydrochloride and sitagliptin should be administered once daily with a meal, preferably with the evening meal. Extended-release metformin hydrochloride in fixed combination with saxagliptin should be administered once daily with the evening meal. Extended-release metformin hydrochloride tablets and fixed-combination preparations containing the extended-release form of the medication must be swallowed whole and not chewed, cut, or crushed; inactive ingredients occasionally may be eliminated in feces as a soft mass that may resemble the original tablet. See the full prescribing information for additional administration instructions for the combination products.

Store metformin hydrochloride immediate- and extended-release tablets at 20--25degreesC in light-resistant containers; excursions permitted to 15--30degreesC. Store metformin hydrochloride oral solution at 15--30degreesC.

Alogliptin is principally renally excreted; cytochrome P-450 (CYP)-related metabolism is negligible.

There are no contraindication interactions for this drug.

Severe Interaction: Action is required to reduce the risk of severe adverse interaction.

Antidiabetic Agents/Gatifloxacin

SEVERITY LEVEL: 2-Severe Interaction: Action is required to reduce the risk of severe adverse interaction.

MECHANISM OF ACTION: The exact mechanism is unknown.

CLINICAL EFFECTS: Concurrent use of gatifloxacin may result in hypoglycemia and/or hyperglycemia.(1-4) Hypoglycemia is more common during the first three days of concurrent therapy. Hyperglycemia is more common after the first three days of concurrent therapy.(2)

PREDISPOSING FACTORS: Elderly patients, especially those with decreased renal function may be predisposed to this interaction.(2)

PATIENT MANAGEMENT: Patients receiving concurrent gatifloxacin should be closely monitored for hypoglycemia during the first three days of concurrent therapy and for hyperglycemia after the first three days of concurrent therapy. Patients should be instructed to discontinue gatifloxacin if hypoglycemia or hyperglycemia occur.(2)

DISCUSSION: Hypoglycemia has been reported with gatifloxacin and glyburide(1,5,6) or glimepiride.(7) In a study in patients with type 2 diabetes mellitus, concurrent gatifloxacin (400 mg daily for 10 days) had no effect on the pharmacokinetics of glyburide (steady state daily regimen); however, pharmacodynamic interactions have been reported.(2) Health Canada has received 19 reports of hypoglycemia in patients taking gatifloxacin. Seventeen of these involved concurrent hypoglycemic agents. Health Canada has received 2 reports of hyperglycemia in patients taking gatifloxacin and hypoglycemic agents. Health Canada has received 2 reports of patients experiencing hypoglycemia and hyperglycemia during concurrent gatifloxacin and hypoglycemic agents.(3) In a study, 13 reports of dysglycemia were reported in patients taking gatifloxacin. Ten of these patients had diabetes mellitus and were on concurrent hypoglycemic agents. Of these ten patients, nine patients experienced hypoglycemia, while one patient experienced hyperglycemia.(8)

Metformin/Iodinated Contrast Materials

SEVERITY LEVEL: 2-Severe Interaction: Action is required to reduce the risk of severe adverse interaction.

MECHANISM OF ACTION: Use of iodinated contrast materials may result in acute changes in renal function, resulting in a decrease in metformin clearance.(1-3)

CLINICAL EFFECTS: Use of iodinated contrast materials may increase levels of metformin, which may result in lactic acidosis.(1-3)

PREDISPOSING FACTORS: Pre-existing renal dysfunction may contribute to decreased clearance of metformin. Other factors which may increase the risk for lactic acidosis include age greater than 65 years, dehydration, metabolic acidosis, sepsis, a history of hepatic impairment, alcoholism, or heart failure.(1-4)

PATIENT MANAGEMENT: Evaluate renal function prior to contrast procedure. According to manufacturer recommendations, discontinue metformin at the time of, or prior to, the contrast imaging procedure in patients with a history of liver disease, alcoholism, heart failure, or if contrast is to be administered intra-arterially. When contrast is to be administered by other routes, discontinue metformin at the time of, or prior to, the procedure for patients with an estimated glomerular filtration rate (eGFR) of 30 to 60 mL/min/1.73 m2. Re-evaluate eGFR 48 hours after the imaging procedure and restart metformin if renal function is stable. Discontinuation of metformin is not required if eGFR is > 60 mL/min/1.73 m2.(4) According to American College of Radiology guidelines, discontinue metformin at the time of, or prior to, the contrast imaging procedure in patients with acute kidney injury or chronic kidney disease (Stage IV or V or eGFR < 30 mL/min/1.73 m2), or who are undergoing arterial catheter studies that might result in emboli (atheromatous or other) to the renal arteries. Re-evaluate eGFR 48 hours after the imaging procedure and restart metformin if renal function is normal. Discontinuation of metformin is not required in patients with no evidence of acute kidney injury and with eGFR >= 30 mL/min/m2.(5)

DISCUSSION: An FDA review of the medical literature showed that metformin may be safely used in patients with mild or moderate renal impairment, resulting in modifications of prescribing recommendations and method for evaluation of renal function.(4) A clinical review of 33 patients on metformin who had received contrast media showed elevations in serum creatinine of the four patients with baseline elevations. The 29 patients with normal baseline renal function showed no elevations after administration of contrast media. The authors recommend that a baseline serum creatinine is obtained for all patients and that metformin should only be discontinued in patients with baseline elevations.(6) A retrospective study of ninety-seven patients currently taking metformin underwent a radiologic procedure with contrast media. Of these patients, 4 developed contrast material associated nephropathy and eight patients had an increased risk of lactic acidosis, with a baseline serum creatinine <1.5mg/dl.(7) A prospective clinical trial with 50 diabetic patients on metformin with baseline serum creatinine <1.47mg/dl showed no statistical difference in renal function before and 48 hours after administration of contrast media. The authors recommend a baseline serum creatinine for all patients and suggest that temporary discontinuation of metformin may not be necessary when baseline renal function is <1.47mg/dl.(8) A systematic review of the literature reveals that 17 of 18 case reports of metformin-induced lactic acidosis involved patients with renal dysfunction prior to administration of contrast media. The authors recommend a baseline serum creatinine in all patients and if renal dysfunction is present, metformin should be discontinued for 48 hours before and after administration of contrast media. The authors recommend follow-up creatinine measurement in patients with prior renal impairment or known comorbidities affecting lactate levels.(9)

Metformin/Tafenoquine

SEVERITY LEVEL: 2-Severe Interaction: Action is required to reduce the risk of severe adverse interaction.

MECHANISM OF ACTION: Metformin renal clearance is mediated by OCT2 and MATE1 transporters.(1) Tafenoquine inhibits elimination by these pathways.(2)

CLINICAL EFFECTS: Use of tafenoquine may increase levels of metformin, which may result in lactic acidosis.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment, sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: The US labeling for metformin recommends the dose of metformin be adjusted as needed.(1) The manufacturer of tafenoquine states the concurrent administration of tafenoquine with OCT2 and MATE1 substrates, such as metformin, should be avoided. If coadministration cannot be avoided, monitor for drug-related toxicities.(2) Evaluate patient's renal function and consider discontinuation in patients with renal impairment. Monitor for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, respiratory distress, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: elevated blood lactate levels (greater than 5 mmol/L), low pH, an increased anion gap, and increased lactate to pyruvate ratio.

DISCUSSION: Metformin renal clearance is mediated by OCT2 and MATE1 transporters.(1) Tafenoquine is believed to inhibit the OCT2 and MATE1 pathways.(2)

Moderate Interaction: Assess the risk to the patient and take action as needed.

Antidiabetic Agents/Gymnema

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Gymnema has been shown to increase the number of insulin-secreting beta cells in animals. It has also been shown to increase the activity of enzymes responsible for glucose uptake and utilization and inhibit peripheral utilization of glucose.(1)

CLINICAL EFFECTS: Use of gymnema may result in decreased requirements of antidiabetic agents.(2-4)

PREDISPOSING FACTORS: None determined.

PATIENT MANAGEMENT: Diabetic patients should be carefully monitored if gymnema is initiated or discontinued from concurrent therapy. The dosage of the patient's antidiabetic agent(s) may need to be adjusted.(2)

DISCUSSION: In a study in 22 non-insulin-dependent patients, patients had decreased blood glucose, glycosylated hemoglobin, and glycosylated plasma proteins during gymnema therapy. Patients were able to decrease the dosage of their conventional antidiabetic therapy and five patients were able to discontinue their conventional antidiabetic therapy.(3) In a study in 27 insulin-dependent patients, patients had decreased insulin requirements, fasting blood glucose, glycosylated hemoglobin, and glycosylated plasma protein levels.(4)

Dipeptidyl Peptidase-Iv Inhibitors/Ace Inhibitors

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Bradykinin can cause vasodilation and increase vascular permeability both directly and by stimulating release of substance P, which also increases vascular permeability.(1) Bradykinin is primarily metabolized by angiotensin-1 converting enzyme (ACE). If ACE is inhibited by ACE inhibitors, other metabolic enzymes become more significant in bradykinin metabolism, including dipeptidyl peptidase-IV (DPP-IV). DPP-IV inhibitors can inhibit both bradykinin and substance P metabolism.(2)

CLINICAL EFFECTS: Concomitant therapy can increase the risk of vasodilation leading to an increase in angioedema risk.(1-3)

PREDISPOSING FACTORS: History of previous angioedema.

PATIENT MANAGEMENT: Patients may be more susceptible to developing angioedema if concomitantly taking an ACE inhibitor and DPP-IV inhibitor. Consider switching the patient to an angiotensin receptor blocker or a different anti-diabetic medication. Use caution in patients receiving concurrent therapy.(3) Monitor closely for signs and symptoms of angioedema (swollen skin, hoarseness, a tight or swollen throat, or trouble breathing). Instruct patients to report angioedema symptoms immediately.

DISCUSSION: A pre-marketing surveillance compared incidence of angioedema in patients on vildagliptin versus a comparator. In all patients combined regardless of ACE inhibitor therapy, there was no association between vildagliptin and angioedema. However among patients taking an ACE inhibitor, vildagliptin was associated with an increased risk of angioedema (odds ratio 9.29 (95% CI 1.22-70.70) from pooled data; odds ratio of 4.57 (95% CI 1.57-13.28) in the meta-analysis). This interaction may be dose-related.(4) In a pooled analysis of data from 19 clinical trials of patients on sitagliptin versus a comparator, there was no difference in the incidence of angioedema between patients on ACE inhibitors and sitagliptin compared to patients on ACE inhibitors alone or patients not on ACE inhibitors.(5) However, events were not adjudicated and encompassed urticaria, anaphylaxis, and hypersensitivity reactions, which may have confounded the results.(6) A disproportionality analysis of the WHO pharmacovigilance database found 340,686 reports of bradykinin-mediated angioedema. Of those, 345 reports involved patients on concomitant ACE inhibitor and DPP-IV inhibitor, with a reporting odds ratio of 42.77 (95% CI 36.93-49.53). There was no association between use of a DPP-IV inhibitor without an ACE inhibitor and angioedema.(7)

Metformin/Bictegravir

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Metformin renal clearance is mediated by OCT2 and MATE1 transport. Bictegravir inhibits elimination by these pathways.(1,2)

CLINICAL EFFECTS: Use of bictegravir may increase levels of metformin, which may result in lactic acidosis.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment,sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: The US labeling for metformin recommends the dose of metformin be adjusted as needed.(1) Evaluate patient's renal function and consider discontinuation of one or both agents in patients with renal impairment. Monitor for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: elevated blood lactate levels (greater than 5 mmol/L), low pH, an increased anion gap, and increased lactate to pyruvate ratio.

DISCUSSION: Bictegravir is an inhibitor of OCT2 and MATE1.(2) Trimethoprim, an inhibitor of OCT2 and MATE1, was found to cause significant inhibition of net transcellular chloroquine transport in canine kidney-OCT2-MATE1 cells. Chloroquine is eliminated by renal tubular secretion involving multidrug and toxin extrusion protein 1 (MATE1). Trimethoprim caused concentration-dependent inhibition of net metformin intake in HEK293-MATE1 cells (human embryonic kidney).(3) A randomized, open-label, two-phase crossover study found that trimethoprim inhibited OCT2, MATE1, and MATE2-K-dependent transport of metformin. Trimethoprim increased metformin area-under-curve (AUC) by 29.4% and decreased metformin renal clearance by 26.4%.(4) In a study in 24 healthy volunteers received metformin 500 mg three times daily for ten days and trimethoprim 200 mg twice daily from days 5-10. Trimethoprim significantly reduced the apparent systemic metformin clearance (CL/F) from 74 to 54 l/h and renal metformin clearance from 31 to 21 l/h. Metformin half-life was prolonged from 2.7 to 3.6h. The metformin plasma concentration (Cmax) increased 38% and the AUC by 37%. Trimethoprim was also associated with a decrease in creatinine clearance and an increase in plasma lactate. (5)

Metformin/Carbonic Anhydrase Inhibitors

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Carbonic anhydrase inhibitors increase bicarbonate excretion which may cause metabolic acidosis.(1) High systemic concentrations of metformin may result in lactic acidosis.(2,3) Topiramate, a mild carbonic anhydrase inhibitor, may also increase systemic exposure to metformin.(1)

CLINICAL EFFECTS: Carbonic anhydrase inhibitors may increase the risk for metformin associated lactic acidosis.(1-3) Untreated lactic acidosis may be fatal. Symptoms of lactic acidosis include malaise, myalgias, respiratory distress, low blood pH, increased anion gap and elevated blood lactate.(2) Carbonic anhydrase inhibitors linked to this monograph are acetazolamide, dichlorphenamide, methazolamide, sulthiame, topiramate, and zonisamide.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment,sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population. The risk for metabolic acidosis is higher with increased doses of either agent.

PATIENT MANAGEMENT: For patients receiving concurrent therapy, monitor renal function and assure that patient does not have risk factors for metformin associated lactic acidosis. Discontinue metformin when risk factors are present. If both drugs are given, monitor renal function and for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, respiratory distress, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: low pH, an increased anion gap, and increased lactate to pyruvate ratio. Manufacturer recommendations: the manufacturer of metformin recommends caution with concomitant use of carbonic anhydrase inhibitors due to an increased risk for metformin associated lactic acidosis.(2) The manufacturer of topiramate notes that topiramate can frequently cause metabolic acidosis and that metformin should not be used in patients with metabolic acidosis.(1)

DISCUSSION: A literature search for lactic acidosis due solely to the combination of metformin and carbonic anhydrase inhibitors or topiramate did not reveal any case reports of symptomatic metabolic acidosis due to this combination. Never-the-less, since carbonic anhydrase inhibitors act by inhibiting the reabsorption of bicarbonate in the renal tubule, some lowering of systemic bicarbonate and pH is common and supports the plausibility of this interaction. In addition, a pharmacokinetic interaction has been described with topiramate. A study in healthy volunteers evaluated the effect of topiramate 100 mg every 12 hours on the kinetics of metformin 500 mg every 12 hours. Mean metformin exposure (area-under-curve or AUC) was increased 25%.(1)

Metformin/Cephalexin

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Cephalexin may inhibit the renal tubular secretion of metformin.(1,2)

CLINICAL EFFECTS: Concurrent use of cephalexin may result in increased levels and clinical effects of metformin,(1,2) as well as an increased risk of lactic acidosis.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment, sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: Patients maintained on metformin should be closely monitored when cephalexin is initiated and discontinued. The dosage of metformin may need to be adjusted.(1)

DISCUSSION: In a randomized, cross-over study in 12 healthy subjects, concurrent metformin (500 mg) and cephalexin (500 mg) increased the maximum concentration (Cmax) and area-under-curve (AUC) of metformin by 34% and 24%, respectively. Metformin renal clearance decreased by 14%.(1,2)

Metformin/Dolutegravir

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Dolutegravir may inhibit the renal organic cation transporter, OCT2, responsible for the elimination of metformin.(1)

CLINICAL EFFECTS: Concurrent use may result in increased plasma levels of metformin and toxicity such as lactic acidosis. Untreated lactic acidosis may be fatal. Symptoms of lactic acidosis include malaise, myalgias, respiratory distress, low pH, increased anion gap and elevated blood lactate.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment,sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: With concomitant use, assess the benefit and risk of metformin in patients on dolutegravir. When starting or stopping dolutegravir, the metformin dose may require an adjustment. Monitor blood glucose when initiating concomitant use and after stopping dolutegravir.(1) Monitor patient's renal function and for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, respiratory distress, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: low pH, an increased anion gap, and increased lactate to pyruvate ratio.(1)

DISCUSSION: Dolutegravir has been shown to inhibit OCT2 in vitro and in vivo and is expected to inhibit the excretion of metformin.(1) In a study in 15 subjects, concomitant metformin (500 mg twice daily) with dolutegravir (50 mg daily) increased the concentration maximum (Cmax) and area-under-curve (AUC) of metformin by 66% and 79%, respectively. In a study in 15 subjects, concomitant metformin (500 mg twice daily) with dolutegravir (50 mg twice daily) increased the Cmax and AUC of metformin by 111% and 145%, respectively.(1)

Metformin/Mate Inhibitors

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Inhibitors of the Multidrug and Toxin Extrusion (MATE) protein transporters in the kidneys may interfere with the renal tubular secretion of metformin.(1)

CLINICAL EFFECTS: Concurrent use may result in increased plasma levels of metformin and toxicity such as lactic acidosis. Untreated lactic acidosis may be fatal. Symptoms of lactic acidosis include malaise, myalgias, respiratory distress, low pH, increased anion gap and elevated blood lactate.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment,sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population. The risk for metabolic acidosis is higher with increased doses of either agent.

PATIENT MANAGEMENT: Use an alternative agent if possible. If both drugs are given, monitor patient's renal function and for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, respiratory distress, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: low pH, an increased anion gap, and increased lactate to pyruvate ratio. Dosage of either agent may need to be adjusted.(1)

DISCUSSION: In a study of normal healthy volunteers, concurrent metformin and oral cimetidine increased metformin maximum concentration (Cmax) in plasma and whole blood by 60% and increased metformin area-under-curve (AUC) levels in plasma and whole blood by 40%.(1) In a study in 7 subjects, concurrent metformin (250 mg daily) with cimetidine (400 mg twice daily) increased metformin AUC by 50%. Metformin renal clearance over 24 hours was reduced by 27%.(2) MATE inhibitors include: brepocitinib, cimetidine, pyrimethamine, and risdiplam.(3)

Metformin/Oct2 Inhibitors

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Agents that inhibit the organic cation transporter 2 (OCT2) may inhibit the excretion of metformin by OCT2 in the kidneys.(1)

CLINICAL EFFECTS: Concurrent use of OCT2 renal transport inhibitors may result in increased levels of and toxicity from metformin.(1)

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment, sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels higher than 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: Consider the potential benefits against the risks of concurrent use of metformin with OCT2 renal transport inhibitors. If concurrent use is appropriate, monitor for toxicities of metformin and consider dosage reduction of metformin.(1)

DISCUSSION: In a study, givinostat increased the levels of creatinine (OCT2 substrate) by 4.76 umol/L from baseline.(1) OCT2 inhibitors linked to this monograph include: arimoclomol, givinostat, trilaciclib, and vimseltinib.(2)

Metformin/Patiromer

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Patiromer may bind to metformin.(1)

CLINICAL EFFECTS: Concurrent use may result in decreased gastrointestinal absorption and loss of efficacy of metformin.(1)

PREDISPOSING FACTORS: None determined.

PATIENT MANAGEMENT: The US manufacturer of patiromer recommends that you administer patiromer at least 3 hours before or 3 hours after metformin.(1)

DISCUSSION: A study in healthy volunteers showed that patiromer decreased the systemic exposure of coadministered metformin. No interaction was seen when these drugs were taken 3 hours apart.(1)

Metformin/Ranolazine

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Ranolazine may decrease renal elimination of metformin by inhibiting OCT-2.(1)

CLINICAL EFFECTS: Concurrent ranolazine may result in elevated levels of and toxicity from metformin.(1)

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment, sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: Monitor patients receiving concurrent therapy with metformin and ranolazine. In patients receiving 1000 mg ranolazine twice daily, limit the dose of metformin to 1700 mg daily.(1)

DISCUSSION: In healthy subjects, ranolazine (1000 mg twice daily) increased exposure of metformin by 80%. Ranolazine (500 mg BID) increased metformin exposure by 40%.(1)

Metformin/Trimethoprim

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Metformin renal clearance is mediated by OCT2 and MATE1 transport. Trimethoprim inhibits elimination by these pathways.

CLINICAL EFFECTS: Use of trimethoprim may increase levels of metformin, which may result in lactic acidosis.

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment,sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population.

PATIENT MANAGEMENT: The US labeling for metformin recommends the dose of metformin and/or trimethoprim be adjusted as needed. Consider the benefits and risks of concomitant use.(1) Evaluate patient's renal function and consider discontinuation of one or both agents in patients with renal impairment. Monitor for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, respiratory distress, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: elevated blood lactate levels (greater than 5 mmol/L), low pH, an increased anion gap, and increased lactate to pyruvate ratio.

DISCUSSION: Trimethoprim was found to cause significant inhibition of net transcellular chloroquine transport in canine kidney-OCT2-MATE1 cells. Chloroquine is eliminated by renal tubular secretion involving multidrug and toxin extrusion protein 1 (MATE1). Trimethoprim caused concentration-dependent inhibition of net metformin intake in HEK293-MATE1 cells (human embryonic kidney). (2) A randomized, open-label, two-phase crossover study found that trimethoprim inhibited OCT2, MATE1, and MATE2-K-dependent transport of metformin. Trimethoprim increased metformin area under the curve (AUC) by 29.4% and decreased metformin renal clearance by 26.4%. (3) 24 healthy volunteers received metformin 500 mg three times daily for ten days and trimethoprim 200 mg twice daily from days 5-10. Trimethoprim significantly reduced the apparent systemic metformin clearance (CL/F) from 74 to 54 l/h and renal metformin clearance from 31 to 21 l/h. Metformin half-life was prolonged from 2.7 to 3.6h. The metformin plasma concentration (Cmax) increased 38% and the AUC by 37%. Trimethoprim was also associated with a decrease in creatinine clearance and an increase in plasma lactate. (4)

Metformin/Vandetanib

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Renal tubular secretion of metformin is mediated by organic cation transporter 2 (OCT2) and the multidrug and toxin extrusion protein (MATE) transporter. Vandetanib inhibits elimination by the OCT2 and MATE pathways.(1)

CLINICAL EFFECTS: Use of vandetanib may increase levels of metformin. Concurrent use may result in increased plasma levels of metformin and toxicity such as lactic acidosis. Untreated lactic acidosis may be fatal. Symptoms of lactic acidosis include malaise, myalgias, respiratory distress, low pH, increased anion gap and elevated blood lactate.(1)

PREDISPOSING FACTORS: Risk factors for metformin associated lactic acidosis include renal impairment, sepsis, dehydration, excessive alcohol intake, acute or chronic metabolic acidosis, hepatic insufficiency, acute heart failure, metformin plasma levels > 5 micrograms/mL, and conditions which may lead to tissue hypoxia. Geriatric patients may also be at higher risk due to slower metformin clearance and increased half-life in this population. The risk for metabolic acidosis is higher with increased doses of either agent.

PATIENT MANAGEMENT: Use an alternative agent if possible. The US labeling for vandetanib recommends caution with concomitant use of metformin and close monitoring for metformin toxicity.(1) Evaluate patient's renal function and consider discontinuation of one or both agents in patients with renal impairment. Monitor for signs and symptoms of metformin toxicity (lactic acidosis) such as malaise, myalgias, respiratory distress, increasing somnolence, and respiratory distress. Laboratory results which may signal lactic acidosis include: elevated blood lactate levels (greater than 5 mmol/L), low pH, an increased anion gap, and increased lactate to pyruvate ratio.

DISCUSSION: A study in 13 healthy subjects receiving a single 1,000 mg dose of metformin 3 hours after a single 800 mg dose of vandetanib resulted in increases in metformin area-under-curve (AUC) of 74% and maximum concentration (Cmax) of 50% with coadministration compared to metformin alone.(1) In a study of normal healthy volunteers, concurrent metformin and oral cimetidine (MATE inhibitor) increased metformin maximum concentration (Cmax) in plasma and whole blood by 60% and increased metformin area-under-curve (AUC) levels in plasma and whole blood by 40%.(1) In a study in 7 subjects, concurrent metformin (250 mg daily) with cimetidine (400 mg twice daily) increased metformin AUC by 50%. Metformin renal clearance over 24 hours was reduced by 27%.(2)

Selected Antidiabetic Agents/Chloroquine; Hydroxychloroquine

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: The exact mechanism is unknown. Chloroquine and hydroxychloroquine may increase insulin sensitivity by inhibiting insulin metabolism and inflammation and increasing cellular uptake of glucose and glycogen synthesis.(1,2) These effects may result in additive hypoglycemia with anti-diabetic agents.

CLINICAL EFFECTS: Concurrent use of chloroquine or hydroxychloroquine and antidiabetic agents may result in severe hypoglycemia.(3) Hypoglycemia can lead to coma.

PREDISPOSING FACTORS: Elderly patients, especially those with decreased renal function may be predisposed to this interaction.

PATIENT MANAGEMENT: Patients maintained on antidiabetic agents who require concurrent therapy with chloroquine or hydroxychloroquine should be closely monitored for hypoglycemia. A decrease in the dose of insulin or other anti-diabetic medications may be required. Patients should be advised of the risk and symptoms of hypoglycemia and to contact their doctor if hypoglycemia occurs.(3) Signs of hypoglycemia may include confusion, dizziness, feeling shaky, unusual hunger, headaches, irritability, pounding heart or very fast pulse, pale skin, sweating, trembling, weakness, or unusual anxiety.

DISCUSSION: Hydroxychloroquine has been shown to cause severe hypoglycemia including loss of consciousness that could be life threatening.(3) Concomitant hypoglycemic agents may increase the risk and/or severity of this effect. A 77 year old man who was stable on twice daily insulin suffered two episodes of hypoglycemic coma 2 weeks after starting prednisone 5 mg daily and hydroxychloroquine 400 mg daily for rheumatoid arthritis. His insulin dosage required a decrease of 37%.(4) Many studies have investigated the glucose-lowering effect of hydroxychloroquine. In a clinical trial of type II diabetics on maximal doses of sulfonylureas, addition of hydroxychloroquine lowered hemoglobin A1C (HbA1C) up to 1% more than placebo.(5) Another clinical trial of type II diabetics on metformin and glimepiride or gliclazide found that hydroxychloroquine 400 mg daily reduced fasting blood glucose (FBG), post-prandial glucose (PPG), and HbA1C to a similar degree as pioglitazone 15 mg daily at 24 weeks.(6) In a prospective observational study, 250 uncontrolled type II diabetics on metformin, glimepiride, pioglitazone, sitagliptin, and a SGLT-2 inhibitor received hydroxychloroquine 400 mg daily for 48 weeks. HbA1C decreased from 8.83% to 6.44%, FBG decreased by 40.78%, and PPG decreased by 58.95%. The doses of metformin were reduced by 50%, glimepiride and sitagliptin by 75%, and SGLT-2 inhibitors were discontinued in most patients.(7)

Selected Weak Cyp2d6 Inhibitors/Tamoxifen

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Inhibitors of CYP2D6 may inhibit the conversion of tamoxifen to endoxifen (an active metabolite of tamoxifen).(1-2) The role of endoxifen in tamoxifen's efficacy has been debated and may involve a minimum concentration level.(3-5)

CLINICAL EFFECTS: Concurrent use of inhibitors of CYP2D6 may decrease the effectiveness of tamoxifen in preventing breast cancer recurrence.

PREDISPOSING FACTORS: Concurrent use of weak CYP2D6 inhibitors in patients who are CYP2D6 intermediate metabolizers should be avoided. Patients who are CYP2D6 poor metabolizers lack CYP2D6 function and are not affected by CYP2D6 inhibition.

PATIENT MANAGEMENT: Although data on this interaction are conflicting, it may be prudent to use alternatives to CYP2D6 inhibitors when possible in patients taking tamoxifen. The US manufacturer of tamoxifen states that the impact on the efficacy of tamoxifen by strong CYP2D6 inhibitors is uncertain and makes no recommendation regarding coadministration with inhibitors of CYP2D6.(12) The manufacturer of paroxetine (a strong CYP2D6 inhibitor) states that alternative agents with little or no CYP2D6 inhibition should be considered.(13) The National Comprehensive Cancer Network's breast cancer guidelines advises caution when coadministering strong CYP2D6 inhibitors with tamoxifen.(14) NCCN states when prescribing a selective serotonin reuptake inhibitor (SSRI), it is reasonable to avoid SSRIs that are strong and moderate CYP2D6 inhibitors, particularly fluoxetine and paroxetine, if an appropriate alternative exists.(14) Cancer Care Ontario breast cancer guidelines state concurrent use of weak CYP2D6 inhibitors should be closely monitored.(15) The European Society of Medical Oncology (ESMO) clinical practice guidelines for early breast cancer states patients on tamoxifen should be advised to avoid concurrent use of strong and moderate CYP2D6 inhibitors. Consider alternatives to tamoxifen if CYP2D6 inhibitors cannot be replaced with alternative agents.(16) If concurrent therapy is warranted, the risks versus benefits should be discussed with the patient.

DISCUSSION: Some studies have suggested that administration of fluoxetine, paroxetine, and quinidine with tamoxifen or a CYP2D6 poor metabolizer phenotype may result in a decrease in the formation of endoxifen (an active metabolite of tamoxifen) and a shorter time to breast cancer recurrence.(1-2,9) A retrospective study of 630 breast cancer patients found an increasing risk of breast cancer mortality with increasing durations of coadministration of tamoxifen and paroxetine. In the adjusted analysis, absolute increases of 25%, 50%, and 75% in the proportion of time of overlapping use of tamoxifen with paroxetine was associated with 24%, 54%, and 91% increase in the risk of death from breast cancer, respectively.(18) The CYP2D6 genotype of the patient may have a role in the effects of this interaction. Patients with wild-type CYP2D6 genotype may be affected to a greater extent by this interaction. Patients with a variant CYP2D6 genotype may have lower baseline levels of endoxifen and may be affected to a lesser extent by this interaction.(6-10) In a retrospective review, 1,325 patients treated with tamoxifen for breast cancer were classified as being poor 2D6 metabolizers (lacking functional CYP2D6 enzymes), intermediate metabolizers (heterozygous alleles), or extensive metabolizers (possessing 2 functional alleles). After a mean follow-up period of 6.3 years, the recurrence rates were 14.9%, 20.9%, and 29.0%, in extensive metabolizers, intermediate metabolizers, and poor metabolizers, respectively.(11) In October of 2006, the Advisory Committee Pharmaceutical Science, Clinical Pharmacology Subcommittee of the US Food and Drug Administration recommended that the US tamoxifen labeling be updated to include information about the increased risk of breast cancer recurrence in poor CYP2D6 metabolizers (either by genotype or drug interaction).(19-20) The labeling changes were never made due to ongoing uncertainty about the effects of CYP2D6 genotypes on tamoxifen efficacy. In contrast to the above information, two studies have shown no relationship between CYP2D6 genotype and breast cancer outcome.(21-23) As well, a number of studies found no association between use of CYP2D6 inhibitors and/or antidepressants in patients on tamoxifen and breast cancer recurrence,(24-28) though the studies were limited by problematic selection of CYP2D6 inhibitors and short follow-up. Weak inhibitors of CYP2D6 include: alogliptin, artesunate, celecoxib, chloroquine, cimetidine, clobazam, clomipramine, cobicistat, delavirdine, diltiazem, dimenhydrinate, diphenhydramine, dronabinol, dupilumab, echinacea, enasidenib, fedratinib, felodipine, fluvoxamine, gefitinib, hydralazine, imatinib, labetalol, lorcaserin, nicardipine, osilodrostat, ranitidine, ritonavir, sarpogrelate, sertraline, verapamil and viloxazine.(29)

Weak Cyp2d6 Inhibitors/Eliglustat

SEVERITY LEVEL: 3-Moderate Interaction: Assess the risk to the patient and take action as needed.

MECHANISM OF ACTION: Weak inhibitors of CYP2D6 may inhibit the metabolism of eliglustat. If the patient is also taking an inhibitor of CYP3A4, eliglustat metabolism can be further inhibited.(1)

CLINICAL EFFECTS: Concurrent use of an agent that is a weak inhibitor of CYP2D6 may result in elevated levels of and clinical effects of eliglustat, including prolongation of the PR, QTc, and/or QRS intervals, which may result in life-threatening cardiac arrhythmias.(1)

PREDISPOSING FACTORS: If the patient is also taking an inhibitor of CYP3A4 and/or has hepatic impairment, eliglustat metabolism can be further inhibited.(1) The risk of QT prolongation or torsades de pointes may be increased in patients with cardiovascular disease (e.g. heart failure, myocardial infarction, history of torsades de pointes, congenital long QT syndrome), hypokalemia, hypomagnesemia, hypocalcemia, bradycardia, female gender, or advanced age.(2) Concurrent use of more than one drug known to cause QT prolongation or higher systemic concentrations of either QT prolonging drug are additional risk factors for torsades de pointes. Factors which may increase systemic drug concentrations include rapid infusion of an intravenous dose or impaired metabolism or elimination of the drug (e.g. coadministration with an agent which inhibits its metabolism or elimination, genetic impairment in drug metabolism or elimination, and/or renal/hepatic dysfunction).(2)

PATIENT MANAGEMENT: The dosage of eliglustat with weak inhibitors of CYP2D6 in poor CYP2D6 metabolizers should be limited to 84 mg daily.(1) The dosage of eliglustat with weak inhibitors of CYP2D6 in extensive CYP2D6 metabolizers with mild (Child-Pugh Class A) hepatic impairment should be limited to 84 mg daily.(1) If concurrent therapy is warranted, consider obtaining serum calcium, magnesium, and potassium levels and monitoring ECG at baseline and at regular intervals. Correct any electrolyte abnormalities. Instruct patients to report any irregular heartbeat, dizziness, or fainting.

DISCUSSION: Paroxetine (30 mg daily), a strong inhibitor of CYP2D6, increased eliglustat (84 mg BID) maximum concentration (Cmax) and area-under-curve (AUC) by 7-fold and 8.4-fold, respectively, in extensive metabolizers. Physiologically-based pharmacokinetic (PKPB) models suggested paroxetine would increase eliglustat Cmax and AUC by 2.1-fold and 2.3-fold, respectively, in intermediate metabolizers. PKPB models suggested ketoconazole may increase the Cmax and AUC of eliglustat (84 mg daily) by 4.3-fold and 6.2-fold, respectively, in poor metabolizers.(1) PKPB models suggested terbinafine, a moderate inhibitor of CYP2D6, would increase eliglustat Cmax and AUC by 3.8-fold and 4.5-fold, respectively, in extensive metabolizers and by 1.6-fold and 1.6-fold, respectively in intermediate metabolizers. PKPB models suggest that concurrent eliglustat (84 mg BID), paroxetine (a strong inhibitor of CYP2D6), and ketoconazole would increase eliglustat Cmax and AUC by 16.7-fold and 24.2-fold, respectively, in extensive metabolizers. In intermediate metabolizers, eliglustat Cmax and AUC would be expected to increase 7.5-fold and 9.8-fold, respectively.(1) PKPB models suggest that concurrent eliglustat (84 mg BID), terbinafine (a moderate inhibitor of CYP2D6), and ketoconazole would increase eliglustat Cmax and AUC by 10.2-fold and 13.6-fold, respectively, in extensive metabolizers. In intermediate metabolizers, eliglustat Cmax and AUC would be expected to increase 4.2-fold and 5-fold, respectively.(1) A single dose of rolapitant increased dextromethorphan, a CYP2D6 substrate, about 3-fold on days 8 and day 22 following administration. Dextromethorphan levels remained elevated by 2.3-fold on day 28 after single dose rolapitant. The inhibitory effects of rolapitant on CYP2D6 are expected to persist beyond 28 days.(5) Weak inhibitors of CYP2D6 include: alogliptin, artesunate, celecoxib, chloroquine, chlorpromazine, clobazam, clomipramine, desvenlafaxine, dimenhydrinate, diphenhydramine, dronabinol, dupilumab, echinacea, enasidenib, felodipine, gefitinib, hydralazine, hydroxychloroquine, lorcaserin, methadone, panobinostat, propafenone, sarpogrelate, sertraline, vemurafenib, and venlafaxine.(3,4)

*Known serious hypersensitivity (e.g., anaphylaxis, angioedema, severe cutaneous adverse reactions) to alogliptin.

*Acute or chronic metabolic acidosis, including diabetic ketoacidosis, with or without coma.

*Severe renal impairment (estimated glomerular filtration rate (eGFR) <30 mL/minute per 1.73 m2).

*Known hypersensitivity to metformin hydrochloride.

• Acute pancreatitis
• Alcohol intoxication
• Alcohol use disorder
• Chronic kidney disease stage 4 (severe) GFR 15-29 ml/min
• Chronic kidney disease stage 5 (failure) GFr<15 ml/min
• Dehydration
• Metabolic acidosis
• Mitochondrial disease
• Sepsis
• Shock

• Acute decompensated heart failure
• Acute myocardial infarction
• Chronic heart failure
• Chronic kidney disease stage 3A (moderate) GFR 45-59 ml/min
• Chronic kidney disease stage 3B (moderate) GFR 30-44 ml/min
• Chronic kidney disease stage 4 (severe) GFR 15-29 ml/min
• Chronic kidney disease stage 5 (failure) GFr<15 ml/min
• Disease of liver
• Hypoglycemic disorder
• Kidney disease with likely reduction in glomerular filtration rate (GFr)
• Severe diarrhea
• Severe hypoxemia
• Severe vomiting

• Debilitation
• Disease of liver
• Fever
• Hypothyroidism
• Infection
• Kidney disease with likely reduction in glomerular filtration rate (GFr)
• Vitamin b12 deficiency

Most common adverse reactions (incidence >=4%) in patients receiving alogliptin monotherapy include nasopharyngitis, headache, and upper respiratory tract infection.

Most common adverse reactions (incidence >=4%) in patients receiving alogliptin in combination with metformin include upper respiratory tract infection, nasopharyngitis, diarrhea, hypertension, headache, back pain, and urinary tract infection.

Most common adverse reactions (incidence >=4%) in patients receiving alogliptin in combination with pioglitazone include nasopharyngitis, back pain, and upper respiratory tract infection.

The most common adverse effects of immediate-release metformin hydrochloride tablets (>5%) are diarrhea, nausea/vomiting, flatulence, asthenia, indigestion, abdominal discomfort, and headache.

The most common adverse effects of metformin hydrochloride oral solution are diarrhea, nausea/vomiting, flatulence, asthenia, indigestion, abdominal discomfort, and headache.

The most common adverse effects of extended-release metformin hydrochloride tablets (>5%) are diarrhea, nausea/vomiting, flatulence, asthenia, indigestion, abdominal discomfort, and headache.

Less Frequent

• Dyspnea
• Heart failure
• Kidney disease with reduction in glomerular filtration rate (GFr)

Rare or Very Rare

• Abnormal hepatic function tests
• Abnormal hepatic function tests
• Acute pancreatitis
• Acute respiratory distress syndrome
• Anaphylaxis
• Angioedema
• Autoimmune hemolytic anemia
• Autoimmune hepatitis
• Bullous pemphigoid
• Cholestatic hepatitis
• Hepatic failure
• Hepatocellular damage
• Hypersensitivity drug reaction
• Hypoglycemic disorder
• Ileus
• Lactic acidosis
• Megaloblastic anemia
• Pancreatitis
• Rhabdomyolysis
• Skin rash
• Stevens-johnson syndrome

More Frequent

• Abdominal distension
• Diarrhea
• Dysgeusia
• Flatulence
• Headache disorder
• Headache disorder
• Nausea
• Pharyngitis
• Upper respiratory infection
• Upper respiratory infection
• Vitamin b12 deficiency
• Vomiting
• Weight loss

Less Frequent

• Acute abdominal pain
• Chills
• Constipation
• Dizziness
• Dyspepsia
• Flu-like symptoms
• Flushing
• General weakness
• Hyperhidrosis
• Interstitial nephritis
• Myalgia
• Nail disorders
• Palpitations
• Rhinitis

Rare or Very Rare

• Anticholinergic toxicity
• Arthralgia
• Constipation
• Diarrhea
• Drowsy
• Hypoglycemic disorder
• Nausea
• Pruritus of skin
• Skin rash
• Urticaria
• Urticaria

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Safety and efficacy of alogliptin alone, in fixed combination with metformin, or in fixed combination with pioglitazone have not been established in pediatric patients. Effectiveness of alogliptin monotherapy was not demonstrated in a 52-week, randomized, double-blind, placebo-controlled trial in 151 pediatric patients 10--17 years of age with inadequately controlled type 2 diabetes mellitus.

Safety and effectiveness of immediate-release metformin hydrochloride tablets and oral solution have been established in pediatric patients 10--16 years of age. Safety and effectiveness of immediate-release metformin hydrochloride tablets and oral solution have not been established in pediatric patients <10 years of age. Use of immediate-release metformin hydrochloride tablets and oral solution is supported by evidence from adequate and well-controlled studies in adults with additional data from a controlled clinical study in pediatric patients 10--16 years of age with type 2 diabetes mellitus, which demonstrated a similar response in glycemic control to that seen in adults. In this study, adverse effects were similar to those described in adults. A maximum daily dosage of 2 g of immediate-release metformin hydrochloride tablets or oral solution is recommended.

Safety and effectiveness of extended-release metformin hydrochloride tablets in pediatric patients have not been established.

There is insufficient evidence with alogliptin in pregnant women to determine a drug-associated risk of major birth defects or miscarriage. No adverse developmental effects were observed when alogliptin was administered to pregnant rats and rabbits during organogenesis at exposures 180- and 149-times the 25 mg clinical dose, respectively, based on plasma drug exposure.

Limited data with metformin hydrochloride in pregnant females are not sufficient to determine a medication-associated risk for major birth defects or miscarriage. Available studies have not reported a clear association with metformin and major birth defects, miscarriage, or adverse maternal or fetal outcomes. Limited data from uncontrolled or retrospective studies are conflicting with regard to the effects of long-term maternal therapy with metformin hydrochloride (1.5-3 g daily) on neonatal morbidity (e.g., congenital malformations) and mortality.

Reproduction studies in rats and rabbits given metformin hydrochloride dosages of 600 mg/kg daily (about twice the maximum recommended human daily dosage based on body surface area or about 3 and 6 times the maximum recommended human daily dosage of extended-release tablets (2 g) based on body surface area comparisons with rats and rabbits, respectively) have not revealed evidence of harm (e.g., teratogenicity) to the fetus. Determination of fetal concentrations of metformin suggest that a partial placental barrier to the medication exists.

Poorly controlled diabetes mellitus in pregnancy increases the maternal risk for diabetic ketoacidosis, pre-eclampsia, spontaneous abortions, preterm delivery, and delivery complications. Poorly controlled diabetes mellitus increases the fetal risk for major birth defects, stillbirth, and macrosomia-related morbidity. Since abnormal maternal blood glucose concentrations during pregnancy may be associated with a higher incidence of congenital abnormalities, most experts recommend that insulin be used during pregnancy to maintain optimum control of blood glucose concentration.

There is no information regarding the presence of alogliptin in human milk, the effects on the breast-fed infant, or the effects on milk production. Alogliptin is distributed into milk in lactating rats. The developmental and health benefits of breast-feeding should be considered along with the mother's clinical need for alogliptin and any potential adverse effects on the breast-fed infant from alogliptin or from the underlying maternal condition.

Metformin is distributed into milk in lactating rats. Limited data indicate that metformin is distributed into breast milk in humans. However, there is insufficient information to determine the effects of metformin on the breast-fed infant and no available information on the effects of metformin on milk production.

Published clinical lactation studies report that metformin present in human milk resulted in infant doses approximately 0.11--1% of the maternal weight-adjusted dosage and a milk/plasma ratio ranging between 0.13 and 1. However, these studies were not designed to establish the risk of metformin use during lactation; limited adverse event data were collected in infants. In a study in 7 nursing females who received metformin hydrochloride (median dosage 1500 mg daily), the mean milk-to-plasma ratio for metformin was 0.35 and the overall average concentration in milk over the dosing interval was 0.27 mg/L. Metformin was present in low or undetectable amounts in the plasma of 4 breast-fed infants, and no adverse effects were noted in 6 infants that were evaluated. In another study, mean peak and trough metformin concentrations in 4 nursing women receiving metformin hydrochloride 500 mg twice daily were 1.06 and 0.42 mcg/mL, respectively, in serum and 0.42 and 0.39 mcg/mL, respectively, in breast milk. The mean milk-to-serum ratio was 0.63 and the mean estimated infant dose as a percentage of the mother's weight-adjusted dose was 0.65%. Blood glucose concentrations obtained in 3 infants 4 hours after breastfeeding were within normal limits (47-77 mg/dL).

The developmental and health benefits of breastfeeding should be considered along with mother's clinical need for the medication and potential adverse effects on the breast-fed child (e.g., hypoglycemia). Breast-fed infants should be monitored for signs of hypoglycemia (e.g., jitters, cyanosis, apnea, hypothermia, excessive sleepiness, poor feeding, seizures).

No dosage adjustment is necessary based on age.

Metformin should be used with caution in geriatric patients since aging is associated with a greater frequency of reduced renal, hepatic, and cardiac function, and of concomitant disease or other therapy, resulting in a higher risk of lactic acidosis. Initial dosages of metformin hydrochloride in geriatric patients should be conservative (initiated at the low end of the dosage range) and should be titrated carefully; limited data suggest reducing dosage by approximately 33% in geriatric patients. In addition, renal function should be monitored more frequently in geriatric patients to determine the appropriate dosage of metformin hydrochloride. Any dosage adjustment in geriatric patients should be based on a careful assessment of renal function.

Of 9052 patients in clinical trials of alogliptin, 24.9% were 65 years of age and older; 4.3% were 75 years of age and older. No substantial differences in safety and efficacy relative to younger adults were observed.

Controlled clinical trials evaluating metformin hydrochloride immediate-release and extended-release tablets did not include sufficient numbers of geriatric patients to determine whether geriatric patients respond differently to metformin than younger patients, although other reported clinical experience has not identified any differences in response between geriatric and younger patients.

In general, dosage selection for a geriatric patient should be cautious, usually starting at the low end of the dosage range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other medication therapy and the higher risk of lactic acidosis. In addition, renal function should be monitored more frequently in geriatric patients and care should be taken in dosage selection; such patients generally should not receive the maximum recommended dosage of metformin hydrochloride.