Escitalopram vs Citalopram

Both escitalopram and citalopram are effective treatments for major depressive disorder. Several head-to-head studies and meta-analyses have compared them, with mixed results.

A 2009 Lancet meta-analysis by Cipriani et al. ranked escitalopram among the most effective and best-tolerated antidepressants. Some studies suggest escitalopram may have a slightly faster onset of action and higher response rates than citalopram, though the clinical significance of these differences is debated.

The dose equivalence is approximately 2:1 — escitalopram 10 mg is roughly equivalent to citalopram 20 mg. For anxiety disorders, escitalopram has more robust FDA-approved evidence, though citalopram is widely used off-label for anxiety.

Both drugs share the common SSRI side effect profile: nausea, headache, insomnia or somnolence, sexual dysfunction, and weight changes. Because escitalopram is the purified active enantiomer, some evidence suggests it may cause fewer side effects than citalopram at equivalent therapeutic doses, as the R-enantiomer in citalopram may contribute to side effects without adding therapeutic benefit.

A critical safety difference involves cardiac effects. In 2011, the FDA issued a safety communication that citalopram should not exceed 40 mg/day (20 mg/day in patients over 60 or with hepatic impairment) due to dose-dependent QT prolongation risk. Escitalopram has a similar but less pronounced QT effect, with a maximum recommended dose of 20 mg/day.

Both drugs are among the SSRIs with the fewest CYP450 drug interactions, making them suitable for patients on multiple medications.

Both drugs are available as low-cost generics. Citalopram has been generic since 2004, and escitalopram since 2012. A 30-day supply of either typically costs $4-$15 at most pharmacies.

Citalopram may be marginally cheaper at some pharmacies due to its longer generic availability, but the cost difference is minimal. Both are covered by virtually all insurance plans.

Both are taken once daily, usually in the morning, as oral tablets. Neither requires administration with food. Both are also available in liquid oral solution form.

Escitalopram's lower dosing (10-20 mg versus 20-40 mg for citalopram) is a minor convenience, and both are equally simple to take. Neither drug requires dose titration in most patients — many patients start on the therapeutic dose.

For most patients, escitalopram and citalopram are nearly interchangeable. Escitalopram may be preferred due to its potentially cleaner side effect profile (purified active enantiomer), slightly more evidence for anxiety disorders, and lower QT prolongation risk than higher doses of citalopram.

Citalopram remains a reasonable choice, particularly for patients who are stable on it and tolerating it well. Switching from citalopram to escitalopram is straightforward due to their close pharmacological relationship.

Both are excellent first-line SSRI options. The choice often comes down to individual response, tolerability, and prescriber preference. Consult your healthcare provider for personalized recommendations.