Escitalopram Oxalate (escitalopram oxalate)

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Last reviewed · Source: First Databank (FDB) drug data

Overview

Escitalopram, the S-enantiomer of citalopram, is a selective serotonin-reuptake inhibitor (SSRI) and an antidepressant.

Escitalopram is the pure S-enantiomer of the racemic bicyclic phthalane derivative citalopram. Escitalopram is at least 100-fold more potent with respect to the inhibition of the reuptake of serotonin (5-hydroxytryptamine (5-HT)) and inhibition of the 5-HT neuronal firing rate than the R-enantiomer.

Like other SSRIs, escitalopram's antidepressant effect is believed to involve potentiation of serotonin activity in the CNS. Escitalopram appears to have little or no effect on reuptake of other neurotransmitters such as norepinephrine and dopamine. In vitro studies have demonstrated escitalopram possesses little or no affinity for alpha- or beta-adrenergic, dopamine D1-5, histamine H1-3, GABA, muscarinic M1-5, or 5-HT1-7 receptors or various ion channels (e.g., calcium, chloride, potassium, sodium channels).

Single- and multiple-dose escitalopram pharmacokinetics are linear and dose-proportional over a dosage range of 10-30 mg daily. Steady state plasma concentrations are achieved within approximately 1 week with once-daily dosing. The extent of accumulation of escitalopram in plasma at steady state in young healthy subjects was 2.2-2.5 times the plasma concentrations seen after a single dose.

The absolute bioavailability of racemic citalopram is about 80% relative to an IV dose. Escitalopram oxalate tablet and oral solution dosage forms are bioequivalent. After a single 20 mg oral dose of escitalopram oxalate tablets or solution, time to achieve peak plasma concentrations is about 5 hours.

After administration of a single oral dose of 15 mg escitalopram oxalate capsules to healthy volunteers, time to achieve peak plasma concentrations was about 4.5 hours under fasting conditions and 5 hours under fed conditions. Absorption of escitalopram is not affected by food.

Escitalopram is about 56% protein bound. The mean terminal half-life is approximately 27-32 hours. The biotransformation of escitalopram is mainly hepatic.

About 7% of the oral clearance of escitalopram is renal.

Escitalopram is metabolized principally by the hepatic cytochrome P-450 (CYP) 2C19 and 3A4 isoenzymes. The principal metabolites are less potent inhibitors of serotonin reuptake, suggesting metabolites do not substantially contribute to the antidepressant activity of escitalopram. Following oral administration, about 8% of escitalopram and 10% of its principal metabolite were recovered in the urine.

USES: This medication is used to treat certain mental/mood disorders (such as depression, anxiety). Escitalopram belongs to a class of drugs known as selective serotonin reuptake inhibitors (SSRIs). It works by helping to restore the balance of a certain natural substance (serotonin) in the brain.

Generic name: escitalopram oxalate
Pronunciation: (ES-sye-TAL-oh-pram)

Reference product & biosimilars

No reference, biosimilar or interchangeable associated with this drug.

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Indications

The following indications are listed for Escitalopram Oxalate:

  • Anxiety With Depression
  • Generalized Anxiety Disorder
  • Major Depressive Disorder

Also known as: Anxiety Associated With Depression, Major Unipolar Illness, Mixed Anxiety And Depressive Disorder, Unipolar Mood Disorder.

Dosing

Dosage of escitalopram oxalate is expressed in terms of escitalopram.

Drug interactions

In vitro studies showed cytochrome P-450 (CYP) isoenzymes 3A4 and 2C19 are the primary enzymes involved in the metabolism of escitalopram.

In vitro data did not reveal an inhibitory effect of escitalopram on CYP3A4, 1A2, 2C9, 2C19, and 2E1 isoenzymes. While in vivo data are limited, drug interaction studies suggest a 20 mg dose of escitalopram has no 3A4 inhibitory effect and a modest 2D6 inhibitory effect.

Contraindications

*Concurrent or recent (i.e., within 14 days) therapy with monoamine oxidase inhibitors (MAOIs), including linezolid and IV methylene blue.

*Concomitant use with pimozide.

*Known hypersensitivity to escitalopram, citalopram, or any ingredient in the formulation.

Adverse reactions

Adverse effects reported in >=5% of patients receiving escitalopram and with an incidence of at least twice that of placebo include insomnia, nausea, increased sweating, sexual dysfunction (ejaculation disorder, decreased libido, anorgasmia), fatigue, and somnolence.

Precautions

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ICD codes

No ICD codes are available for this drug.

Formulary status

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Last reviewed · Source: First Databank (FDB) drug data