Citalopram vs Escitalopram
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Citalopram (Celexa) and escitalopram (Lexapro) are two of the most commonly prescribed selective serotonin reuptake inhibitors (SSRIs) for depression and anxiety [1][2]. What makes this comparison unique is their molecular relationship: escitalopram is the active S-enantiomer of citalopram. Citalopram is a racemic mixture containing both the S- and R-enantiomers.
This means escitalopram contains only the therapeutically active portion of citalopram, allowing it to achieve comparable or superior clinical effects at half the dose [2][3]. This pharmacological relationship explains many of the practical differences between these medications.
Escitalopram was developed and approved in 2002 after citalopram (approved 1998) to provide a more refined version of the same antidepressant mechanism [1][2]. Both are widely prescribed and available as affordable generics.
Citalopram vs Escitalopram: Side-by-side comparison
| Category | Citalopram | Escitalopram |
|---|---|---|
| Drug Class | SSRI (racemic mixture) | SSRI (S-enantiomer of citalopram) |
| Generic Name | Citalopram hydrobromide | Escitalopram oxalate |
| Brand Name | Celexa | Lexapro |
| FDA Approved For | Major depressive disorder | MDD, generalized anxiety disorder |
| How It Works | Inhibits serotonin reuptake (S+R enantiomers) | Inhibits serotonin reuptake (S-enantiomer only) |
| Dosage Forms | Tablets (10, 20, 40 mg), oral solution | Tablets (5, 10, 20 mg), oral solution |
| Typical Dose | 20-40 mg once daily | 10-20 mg once daily |
| Max Dose | 40 mg/day (20 mg if age >60) | 20 mg/day |
| QTc Prolongation | Significant (FDA dose limit) | Minimal at therapeutic doses |
| Common Side Effects | Nausea, dry mouth, drowsiness, insomnia, sexual dysfunction | Nausea, insomnia, sexual dysfunction, headache |
| Cost (Generic) | $4-$12/month | $5-$15/month |
| Dose Equivalence | 20 mg | ~10 mg |
Efficacy: How well does each drug work?
Multiple clinical trials and meta-analyses have compared these two SSRIs [3][4]. Escitalopram has demonstrated statistically superior efficacy compared to citalopram in some studies, with faster onset of antidepressant action and higher remission rates [3].
The landmark Cipriani et al. network meta-analysis of 21 antidepressants ranked escitalopram among the most effective and best-tolerated antidepressants, while citalopram ranked in the middle tier [4]. Escitalopram 10-20 mg was generally equivalent to or slightly better than citalopram 20-40 mg in head-to-head trials [3].
For anxiety disorders, escitalopram has FDA approval for generalized anxiety disorder, while citalopram does not (though it is widely used off-label for anxiety) [1][2]. Both are effective anxiolytics in clinical practice.
The clinical significance of the efficacy difference is debated — many clinicians consider them therapeutically equivalent for most patients, with the practical difference being dosing and QTc risk [3].
Side effects comparison
Both medications share the typical SSRI side effect profile: nausea, insomnia, sexual dysfunction, drowsiness, dry mouth, and increased sweating [1][2]. However, there are meaningful differences.
Escitalopram is generally better tolerated than citalopram in clinical trials, with lower rates of discontinuation due to side effects [3][4]. This likely reflects the removal of the R-enantiomer, which may contribute to some of citalopram's side effects without adding therapeutic benefit.
The most significant safety difference is QTc prolongation. In 2012, the FDA issued a safety communication limiting citalopram's maximum dose to 40 mg/day (20 mg/day in patients over 60 or with hepatic impairment) due to dose-dependent QTc prolongation risk [1]. Escitalopram does not carry the same degree of QTc concern at therapeutic doses, though caution is advised at higher doses [2].
Both carry the standard SSRI boxed warning about suicidal ideation in young adults (under 25). Both can cause serotonin syndrome when combined with other serotonergic medications and discontinuation syndrome if stopped abruptly [1][2].
Cost comparison
Convenience and dosing
Both are once-daily medications taken in the morning or evening [1][2]. Citalopram is available in 10, 20, and 40 mg tablets plus oral solution [1]. Escitalopram is available in 5, 10, and 20 mg tablets plus oral solution [2]. The dose equivalence is approximately 2:1 (citalopram 20 mg is roughly equivalent to escitalopram 10 mg). Both have similar onset of action (2-4 weeks for full effect).
Which is right for you?
Escitalopram is generally considered the preferred choice over citalopram for new prescriptions due to slightly better tolerability, possibly superior efficacy, and lower QTc risk [3][4].
Citalopram remains appropriate for patients who are stable and doing well on it — there is generally no reason to switch a patient who is responding well to citalopram [1]. It may also be selected when the small cost advantage matters.
For patients over 60, escitalopram may be specifically preferred due to citalopram's 20 mg dose ceiling in this age group [1][2]. An ECG should be considered before starting citalopram in patients with cardiac risk factors.
This information is for educational purposes only. Consult your healthcare provider for antidepressant selection.
Frequently asked questions
References
- [Regulatory] Citalopram (Celexa) prescribing information. Forest/Allergan. https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/020822s049lbl.pdf Accessed 2025-06-15.
- [Regulatory] Escitalopram (Lexapro) prescribing information. Forest/Allergan. https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/021323s049lbl.pdf Accessed 2025-06-15.
- [Regulatory] Sanchez C, et al. Escitalopram versus citalopram: the surprising role of the R-enantiomer. Psychopharmacology. 2004;174(2):163-176. https://doi.org/10.1007/s00213-004-1865-z Accessed 2025-06-15.
- [Regulatory] Cipriani A, et al. Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder. Lancet. 2018;391(10128):1357-1366. https://doi.org/10.1016/S0140-6736(17)32802-7 Accessed 2025-06-15.
- [Observational] GoodRx price comparison: citalopram and escitalopram. https://www.goodrx.com Accessed 2025-06-15.
Written and fact-checked by PrescriptionDrugs.org Editorial Team
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