Warrior A-Relief Rectal Cream (lidocaine/phenylephrine HCl)

To produce decongestion of the conjunctiva, 1 or 2 drops of a 0.12-0.25% ophthalmic solution of phenylephrine hydrochloride may be applied topically to the conjunctiva every 3-4 hours (up to 4 times daily for self-medication) as needed. Vasoconstriction for diagnosis of ocular congestion or to improve visualization of ocular blood vessels in sickle-cell disease may be achieved by application of 1 or 2 drops of a 2.5% solution. In the ''blanching test'', congestion probably is caused by conjunctivitis rather than iridocyclitis if the drug produces perilimbal blanching in the congested eye. A 2.5 or 10% solution of the drug may also be administered prior to surgery to produce mydriasis and aid in controlling hemorrhage. (See Phenylephrine Hydrochloride 52:24.)

To produce nasal decongestion in adults and children 12 years of age or older, the usual dosage is 2 or 3 drops, 1-3 sprays, or 1-3 metered sprays instilled in each nostril. In cases of extreme nasal congestion in adults, a 1% solution may be used initially. To produce nasal decongestion in children 6-12 years of age, 2 or 3 drops or 1 or 2 sprays of a 0.25% solution may be instilled in each nostril. Doses of the drug as drops or spray may be repeated in 4 hours if needed. Phenylephrine nasal solutions should not be used for self-medication for longer than 3 days; if symptoms persist, the drug should be discontinued and a physician consulted. Intranasal application of phenylephrine should generally be used for no longer than 3-5 days.

For use with local anesthetics, phenylephrine hydrochloride may be used in concentrations of 1:2500 to 1:20,000.

Dosage of lidocaine hydrochloride varies with the anesthetic procedure, the degree of anesthesia required, and individual patient response. The usual dosages should generally be reduced in children, geriatric patients, debilitated or acutely ill patients, and patients with cardiac and/or hepatic disease. The smallest dose and lowest concentration required to produce the desired effect should be used. Use of dilute solutions (i.e., 0.25-0.5%) and total dosages not to exceed 3 mg/kg are recommended for induction of IV regional anesthesia in children.

Single doses of lidocaine hydrochloride (for anesthesia other than spinal) should not exceed 4.5 mg/kg (or 300 mg) in healthy adults or 4.5 mg/kg in children younger than 10 years of age. When administered with epinephrine, lidocaine hydrochloride doses should not exceed 7 mg/kg (or 500 mg) in healthy adults or 7 mg/kg in children younger than 10 years of age. For spinal anesthesia, up to 100 mg of the drug may be given. For continuous epidural or caudal anesthesia, the maximum dose should not be repeated at intervals of less than 1.5 hours. When continuous lumbar or caudal epidural anesthesia is used for nonobstetric procedures, additional drug may be administered if necessary to attain adequate anesthesia. For paracervical block for nonobstetric and obstetric analgesia (including abortion), the maximum recommended dosage (200 mg) should not be repeated at intervals of less than 1.5 hours. For IV regional anesthesia in adults using a 0.5% solution without epinephrine, the dose administered should not exceed 4 mg/kg.

Solutions of 1-2% lidocaine hydrochloride with or without epinephrine and containing no preservatives are used for epidural or caudal anesthesia. To prevent intravascular or subarachnoid injection of a large epidural dose of lidocaine, a test dose (e.g., 2-3 mL of a 1.5% solution) of anesthetic solution should be injected at least 5 minutes prior to administering the total dose. When clinical conditions permit, use of a test dose solution that contains epinephrine (e.g., 10-15 mcg) should be considered to detect inadvertent intravascular injection. The test dose should be repeated if the patient is moved such that the epidural catheter may have been displaced. Rapid injection of a large, single dose through a catheter should be avoided; instead, the drug should be administered, when feasible, in fractional doses. In epidural anesthesia, 2-3 mL of the indicated solution is usually required for each dermatome to be anesthetized. In caudal block for production of obstetric analgesia or in epidural thoracic block, 20-30 mL of a 1% solution (200-300 mg) of the drug may be used. For surgical anesthesia with caudal block, 15-20 mL of a 1.5% solution (225-300 mg) is given. For epidural lumbar analgesia, the dose is 25-30 mL (250-300 mg) of a 1% solution, and for epidural lumbar anesthesia, the recommended dose is 15-20 mL of a 1.5% solution (225-300 mg) or 10-15 mL of a 2% solution (200-300 mg).

A solution of 5% lidocaine hydrochloride with 7.5% dextrose is used for spinal anesthesia in adults and adolescents 16 years of age or older. For obstetric low spinal or saddle-block anesthesia in a normal vaginal delivery, the dose is approximately 1 mL (50 mg). For cesarean section or deliveries which require intrauterine manipulations, 1.5 mL of the 5% solution (75 mg) may be given. For surgical anesthesia, 1.5-2 mL of the 5% solution (75-100 mg) may be administered.

The following doses of lidocaine hydrochloride have been suggested for various nerve blocks: brachial nerve block, 15-20 mL of a 1.5% solution (225-300 mg); dental nerve block, 1-5 mL of a 2% solution (20-100 mg); intercostal nerve block, 3 mL of a 1% solution (30 mg); paravertebral nerve block, 3-5 mL of a 1% solution (30-50 mg); pudendal nerve block (each side), 10 mL of a 1% solution (100 mg); and paracervical nerve block (each side) for obstetric analgesia, 10 mL of a 1% solution (100 mg). For sympathetic nerve blocks, the following doses may be used: cervical (stellate ganglion) nerve block, 5 mL of a 1% solution (50 mg), and lumbar nerve block, 5-10 mL of a 1% solution (50-100 mg). For percutaneous infiltration anesthesia, the dose of lidocaine hydrochloride is 1-60 mL of a 0.5 or 1% solution (5-300 mg). For IV regional anesthesia, 10-60 mL of a 0.5% solution (50-300 mg) may be employed.

For retrobulbar injection, 3-5 mL of a 4% sterile solution (120-200 mg) or 1.7-3 mg/kg is suggested; a portion of the dose is injected retrobulbarly and the remainder may be used to block the facial nerve.

For transtracheal injection, 2-3 mL of a 4% solution (80-120 mg) is administered rapidly. When both transtracheal injection and topical application (oropharyngeal spray) of a 4% solution are needed to achieve complete analgesia, the combined total dose of lidocaine hydrochloride administered by injection and by oropharyngeal spray should not exceed 5 mL of a 4% solution (200 mg) or 3 mg/kg.

Lidocaine hydrochloride with or without epinephrine is used for various dental procedures by infiltration injection or nerve block. In oral infiltration and/or mandibular block, initial doses of 1-5 mL of 2% lidocaine hydrochloride (20-100 mg) with epinephrine 1:100,000 are usually effective. If greater hemostasis is required, epinephrine 1:50,000 may be used. In children younger than 10 years of age, 0.9-1 mL of 2% lidocaine hydrochloride (18-20 mg) is adequate for a procedure involving 1 tooth (local infiltration), 2-3 teeth (maxillary infiltration), or teeth in an entire quadrant (mandibular block).

Phenylephrine hydrochloride ophthalmic solutions are applied topically to the conjunctiva. Digital pressure should be applied on the lacrimal sac for 1-2 minutes following topical instillation of ophthalmic solutions to minimize drainage into the nose and throat and reduce the risk of absorption and systemic reactions. Excess solution around the eye should be removed with a tissue.

For intranasal applications, phenylephrine may be administered in solution as drops or spray. Vicks Sinex(R) (with mist spray nozzle) nasal solution is administered by nasal inhalation using a special nasal inhaler that produces metered droplet sprays. Care must be taken to avoid contamination of the dropper, inhaler, or spray. Except in young children in whom sprays are difficult to use, nasal sprays may be preferable to drops because of the lesser risk of swallowing the drug and resultant systemic absorption. Drops should be applied to the dependent (lower) nostril, with the patient in a lateral head-low position. The patient should remain in the same position for 5 minutes, then the solution should be applied to the other nostril in a similar manner. Alternatively, drops may be instilled when the patient is reclining with the head tilted back as far as possible. Sprays should be delivered or pumped (Vicks Sinex(R) metered spray) into each nostril with the patient's head erect so that excess solution is not released. The nose should be blown thoroughly 3-5 minutes later. Prior to initial use of the metered sprays, the nasal inhaler must be primed by depressing the pump firmly several times. To minimize the risk of spreading infections, droppers, inhalers, and spray dispensers should not be used by more than one person, and tips of the dispensers, inhalers, or droppers should be rinsed with hot water following use.

Phenylephrine nasal solutions also may be applied to a tampon or nasal pack for insertion into nasal passages. However, this method of application should be restricted to use in diagnostic or surgical procedures performed under medical supervision because mechanical injury may occur.

Lidocaine hydrochloride may be administered by infiltration or by epidural (including caudal) block, peripheral or sympathetic nerve block, and subarachnoid block. The manufacturers state that only the preservative-free, epinephrine-free 0.5% lidocaine injection should be used for IV regional anesthesia. Local anesthetics, including lidocaine hydrochloride, have been administered by continuous intra-articular infusion+ (e.g., for control of postoperative pain); however, such use has been associated with chondrolysis. Lidocaine hydrochloride solutions containing preservatives shouldnot be used for spinal or epidural (including caudal) block. Partially used bottles of solutions that do not contain preservatives should be discarded.

Aspiration for blood should be performed prior to injection of lidocaine hydrochloride to avoid inadvertent intravascular administration; however, a negative aspiration does not ensure protection against inadvertent intravascular injection.

Local anesthetics should only be administered by clinicians who are experienced in the diagnosis and management of dose-related toxicities and other acute emergencies associated with these agents. Resuscitative equipment, oxygen, drugs, and personnel required for treatment of adverse reactions should be immediately available when lidocaine is administered. Proper positioning of the patient is extremely important in spinal anesthesia. For specific procedures and techniques of administration, specialized references should be consulted.

No dosing information is available for this tab.

No dosing information is available for this tab.

When applied topically to the conjunctiva (especially in concentrations of 2.5% or greater), phenylephrine hydrochloride must be administered under careful supervision and in reduced dosage if used within 21 days after the patient has received a monoamine oxidase (MAO) inhibitor because potentiation of the pressor effects of phenylephrine may result. Nasal solutions containing phenylephrine must not be given to a patient receiving an MAO inhibitor. The pressor response to phenylephrine may also be potentiated if a tricyclic antidepressant is administered concomitantly.

Concomitant administration of phenylephrine with cycloplegic antimuscarinic drugs such as atropine sulfate, cyclopentolate hydrochloride, homatropine hydrobromide, or scopolamine hydrobromide produces increased mydriatic effects.

There are no contraindication interactions for this drug.

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

Agents That Affect Catecholamines/Iobenguane I 123

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

MECHANISM OF ACTION: Many compounds that reduce catecholamine uptake or that deplete catecholamine stores may interfere with iobenguane uptake into cells.(1)

CLINICAL EFFECTS: Compounds that reduce catecholamine uptake or that deplete catecholamine stores may interfere with imaging completed with iobenguane.(1)

PREDISPOSING FACTORS: None determined.

PATIENT MANAGEMENT: Discuss the use of agents that affect catecholamines. Discontinue drugs that reduce catecholamine uptake or deplete catecholamine stores prior to imaging with iobenguane. Before imaging with iobenguane, discontinue agents that affect catecholamines for at least 5 biological half-lives, as clinically tolerated.(1)

DISCUSSION: Many agents may reduce catecholamine uptake or deplete catecholamine stores.(1) Examples include: - CNS stimulants or amphetamines (e.g. cocaine, methylphenidate, dextroamphetamine) - norepinephrine and dopamine reuptake inhibitors (e.g. phentermine) - norepinephrine and serotonin reuptake inhibitors (e.g. tramadol) - monoamine oxidase inhibitors (e.g. phenelzine, linezolid) - central monoamine depleting drugs (e.g. reserpine) - non-select beta adrenergic blocking drugs (e.g. labetalol) - alpha agonists or alpha/beta agonists (e.g. pseudoephedrine, phenylephrine, ephedrine, phenylpropanolamine, naphazoline) - tricyclic antidepressants or norepinephrine reuptake inhibitors (e.g. amitriptyline, bupropion, duloxetine, mirtazapine, venlafaxine) - botanicals that may inhibit reuptake of norepinephrine, serotonin or dopamine (e.g. ephedra, ma huang, St. John's Wort, yohimbine)

Agents That Affect Catecholamines/Iobenguane I 131

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

MECHANISM OF ACTION: Many compounds that reduce catecholamine uptake or that deplete catecholamine stores may interfere with iobenguane uptake into cells.(1)

CLINICAL EFFECTS: Compounds that reduce catecholamine uptake or that deplete catecholamine stores may impact the dosimetry calculations or effectiveness of iobenguane.(1)

PREDISPOSING FACTORS: None determined.

PATIENT MANAGEMENT: Discuss the use of agents that affect catecholamines. Discontinue drugs that reduce catecholamine uptake or deplete catecholamine stores for at least 5 half-lives before administration of either the dosimetry or a therapeutic dose of iobenguane. Do not administer these drugs until at least 7 days after each iobenguane dose.(1)

DISCUSSION: Many agents may reduce catecholamine uptake or deplete catecholamine stores.(1) Examples include: - CNS stimulants or amphetamines (e.g. cocaine, methylphenidate, dextroamphetamine) - norepinephrine and dopamine reuptake inhibitors (e.g. phentermine) - norepinephrine and serotonin reuptake inhibitors (e.g. tramadol) - monoamine oxidase inhibitors (e.g. phenelzine, linezolid) - central monoamine depleting drugs (e.g. reserpine) - non-select beta adrenergic blocking drugs (e.g. labetalol) - alpha agonists or alpha/beta agonists (e.g. pseudoephedrine, phenylephrine, ephedrine, phenylpropanolamine, naphazoline) - tricyclic antidepressants or norepinephrine reuptake inhibitors (e.g. amitriptyline, bupropion, duloxetine, mirtazapine, venlafaxine) - botanicals that may inhibit reuptake of norepinephrine, serotonin or dopamine (e.g. ephedra, ma huang, St. John's Wort, yohimbine) - calcium channel blockers

Local Anesthetics/Long-Acting Bupivacaine

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

MECHANISM OF ACTION: Concurrent use of other local anesthetics or use of other local anesthetics within 96 hours following long-acting bupivacaine may result in additive neurologic and cardiovascular effects. Use of articaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, procaine, ropivacaine, and tetracaine may also increase the risk of methemoglobinemia.(1,2) Non-liposomal bupivacaine may impact the pharmacokinetic and/or physicochemical properties of the liposomal formulation when administered in the same syringe or used simultaneously unless the ratio of mg of non-liposomal bupivacaine to mg of bupivacaine liposomal does not exceed 1:2.(1) Local anesthetics other than bupivacaine may trigger the immediate release of bupivacaine from the liposomal formulation when administered together locally.(1)

CLINICAL EFFECTS: Concurrent or use of local anesthetics with 96 hours of use of long-acting bupivacaine may result in neurologic and cardiovascular toxicity. Use of articaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, procaine, ropivacaine, and tetracaine may also result in methemoglobinemia.(1,2) Non-liposomal bupivacaine may impact the pharmacokinetic and/or physicochemical properties of the liposomal formulation when administered in the same syringe or used simultaneously unless the ratio of mg of non-liposomal bupivacaine to mg of bupivacaine liposomal does not exceed 1:2.(1) Local anesthetics other than bupivacaine may trigger the immediate release of bupivacaine from the liposomal formulation when administered together locally.(1)

PREDISPOSING FACTORS: Use of additional agents that are associated with methemoglobinemia may further increase the risk of methemoglobinemia.(1) Patients who are at increased risk of developing methemoglobinemia include those with glucose-6-phosphate dehydrogenase deficiency, congenital or idiopathic methemoglobinemia, cardiac or pulmonary compromise, infants under 6 months of age, and concurrent exposure to oxidizing agents or their metabolites are more susceptible to developing clinical manifestations of the condition. If local anesthetics must be used in these patients, close monitoring for symptoms and signs of methemoglobinemia is recommended.(1)

PATIENT MANAGEMENT: Avoid the use of other local anesthetics within 96 hours following the administration of long-acting bupivacaine. In patients for whom use is required, monitor for neurologic and cardiovascular effects. Also monitor for methemoglobinemia with use of articaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, procaine, ropivacaine, and tetracaine.(1,2) Non-liposomal bupivacaine may be administered in the same syringe as bupivacaine liposomal or injected immediately before bupivacaine liposomal as long as the ratio of mg of non-liposomal bupivacaine to mg of bupivacaine liposomal does not exceed 1:2.(1) Lidocaine may be administered 20 minutes or more prior to bupivacaine. It is unknown if other local anesthetics may be used without compromising the release characteristic of bupivacaine liposomal.(1)

DISCUSSION: Concurrent use of other local anesthetics or use of other local anesthetics within 96 hours following long-acting bupivacaine may result in additive neurologic and cardiovascular effects. Use of articaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, procaine, ropivacaine, and tetracaine may also increase the risk of methemoglobinemia.(1,2) Non-liposome bupivacaine may impact the pharmacokinetic and/or physicochemical properties of the liposomal formulation when administered in the same syringe or used simultaneously unless the ratio of mg of non-liposomal bupivacaine to mg of bupivacaine liposomal does not exceed 1:2.(1) Local anesthetics other than bupivacaine may trigger the immediate release of bupivacaine from the liposomal formulation when administered together locally. Lidocaine may be administered 20 minutes or more prior to bupivacaine. It is unknown if other local anesthetics may be used without compromising the release characteristic of bupivacaine liposomal.(1)

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

Sympathomimetics (DIRECT, MIXED-ACTING)/Methyldopa

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

MECHANISM OF ACTION: Unknown.

CLINICAL EFFECTS: The pressor response to sympathomimetics may be increased.

PREDISPOSING FACTORS: None determined.

PATIENT MANAGEMENT: Start with low doses of sympathomimetics and monitor blood pressure of patients during concurrent administration of sympathomimetics and methyldopa.

DISCUSSION: The pressor response to sympathomimetics has been reported to be increased during methyldopa administration. In addition to increased duration of pressor response, severe hypertension has been reported.

Sympathomimetics/Rauwolfia Alkaloids

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

MECHANISM OF ACTION: Reserpine depletes catecholamine stores within the peripheral vascular adrenergic nerve endings, thus indirect acting sympathomimetics are unable to trigger the release of catecholamines. The reserpine-induced catecholamine release increases sensitivity to the effects of direct acting sympathomimetics.

CLINICAL EFFECTS: Increased effects of direct acting sympathomimetics. Decreased effects of indirect acting sympathomimetics. Mixed acting sympathomimetics will show effects based on the predominance of either direct or indirect activity.

PREDISPOSING FACTORS: None determined.

PATIENT MANAGEMENT: If these agents are administered concurrently, monitor blood pressure. The dose of the sympathomimetic may need to be adjusted.

DISCUSSION: This interaction has been well documented in animal studies and human case reports have confirmed the interaction. Reserpine has been shown to decrease the response to epinephrine administered for hypotension. Reserpine has also been shown to decrease the effectiveness of ophthalmic epinephrine, a direct acting sympathomimetic. Ophthalmic phenylephrine has been shown to decrease the hypotensive effects of reserpine.

There is no enhanced messaging for this drug.

• Methemoglobinemia

• Glucose-6-phosphate dehydrogenase (g6Pd) deficiency
• Heart block
• Hemolytic anemia from pyruvate kinase and g6PD deficiencies
• Shock

• Benign prostatic hyperplasia
• Cardiac arrhythmia
• Coronary artery disease
• Disease of liver
• Hypertension
• Hyperthyroidism
• Nervousness

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Less Frequent

• Dermatitis due to topical drug

Rare or Very Rare

• Acute respiratory failure
• Anaphylaxis
• Angioedema
• Bradycardia
• Bronchospastic pulmonary disease
• Cardiac arrhythmia
• Cardiac arrhythmia
• CNS toxicity
• Cyanosis
• Dizziness
• Eyelid edema
• Headache disorder
• Headache disorder
• Hyperhidrosis
• Hypotension
• Insomnia
• Methemoglobinemia
• Nervousness
• Pallor
• Respiratory depression
• Seizure disorder
• Tachycardia
• Tremor
• Unconsciousness

Less Frequent

• Blanching of skin
• Edema
• Erythema
• Pruritus of skin
• Skin rash
• Stinging of skin
• Urticaria

Rare or Very Rare

• Acute cognitive impairment
• Apprehension
• Blurred vision
• Dizziness
• Drowsy
• Euphoria
• Muscle fasciculation
• Nervousness
• Rectal irritation
• Sensation of cold
• Sensation of warmth
• Tinnitus
• Tremor
• Vomiting

No enhanced messaging available.

No enhanced messaging available.

Animal reproduction studies have not been performed with phenylephrine. It is not known whether topically applied phenylephrine can cause fetal harm when administered to pregnant women. Parenterally administered phenylephrine in late pregnancy or labor may cause fetal anoxia. (See Cautions: Pregnancy and Lactation, in Phenylephrine Hydrochloride 12:12.04.) Topically applied phenylephrine should be used during pregnancy only when clearly needed.

Since it is not known whether phenylephrine is distributed into milk, the drug should be used with caution in nursing women.

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