Sertraline vs Citalopram

Both sertraline and citalopram demonstrate robust efficacy for major depressive disorder, with response rates of 50–65% in clinical trials ^[1][2]. The 2018 Cipriani network meta-analysis ranked sertraline slightly higher than citalopram for both efficacy and acceptability, though the differences were modest ^[3]. Sertraline has broader FDA-approved indications: MDD, OCD, panic disorder, PTSD, social anxiety disorder, and PMDD ^[1]. Citalopram is FDA-approved only for MDD, though it is widely used off-label for anxiety disorders with supporting evidence ^[2]. For OCD, sertraline is generally preferred because its mild dopaminergic activity may enhance antiobsessional effects, and it has an FDA indication for this condition ^[3]. For depression with prominent cognitive symptoms, citalopram's cleaner pharmacological profile (fewer drug interactions) may be advantageous in complex medication regimens ^[4].

Both share the typical SSRI side-effect profile. Sertraline is notably associated with diarrhea (14–20%), nausea, and GI upset ^[1]. Citalopram tends to cause more sedation and weight gain compared to sertraline ^[2]. Sexual dysfunction (decreased libido, anorgasmia, erectile dysfunction) occurs with both at rates of 25–40%. The most clinically significant difference is cardiac: citalopram carries an FDA safety communication limiting the maximum dose to 40 mg/day (20 mg/day in patients over 60, with hepatic impairment, or taking CYP2C19 inhibitors) due to dose-dependent QTc prolongation ^[2]. Sertraline does not carry this restriction ^[1]. This QTc concern makes citalopram less suitable for patients with cardiac risk factors, those on other QTc-prolonging medications, or elderly patients requiring higher doses ^[4]. Both drugs are relatively safe in overdose compared to older antidepressants, though citalopram's QTc effects make large overdoses more dangerous. Neither drug has major drug-drug interactions with CYP enzymes, though citalopram is slightly more susceptible to CYP2C19 inhibitor interactions ^[3].

Both medications are available as very affordable generics. Generic sertraline 50 mg (30 tablets) costs $4–15 ^[1]. Generic citalopram 20 mg (30 tablets) costs $4–10 ^[2]. Both are on most pharmacy $4 generic lists. Brand-name Zoloft and Celexa cost $200–350/month but are rarely prescribed. Insurance coverage is universal for both at the lowest copay tier. For cost-sensitive patients, citalopram may have a very slight edge due to its broader availability on deep-discount programs.

Both are taken once daily. Sertraline doses range from 50–200 mg/day, typically taken in the morning with food (which enhances absorption) ^[1]. Citalopram doses range from 10–40 mg/day (maximum 20 mg in patients over 60) and can be taken with or without food ^[2]. Citalopram's lower maximum dose due to the FDA QTc restriction means less dose flexibility at the high end. Sertraline is available in 25, 50, and 100 mg tablets and an oral concentrate solution ^[1]. Citalopram comes in 10, 20, and 40 mg tablets and an oral solution ^[2]. Both require gradual tapering to avoid discontinuation symptoms. Neither requires routine laboratory monitoring, though an ECG may be advisable before starting citalopram in patients with cardiac risk factors or when using doses above 20 mg ^[4].

Sertraline is generally the more versatile choice due to its broader FDA-approved indications (especially for OCD, PTSD, and panic disorder), lack of dose-ceiling restrictions, and no QTc prolongation concerns ^[1][3]. Citalopram may be preferred when minimal drug interactions are a priority (simpler pharmacology in polypharmacy situations), when sedation is a desired secondary effect (better for patients with insomnia), or for patients who have tried sertraline without adequate response ^[2]. Citalopram should be used cautiously in patients over 60 (20 mg maximum), those with cardiac disease or QTc prolongation risk, and those on other QTc-prolonging medications ^[4]. For most patients starting SSRI therapy, sertraline or escitalopram (the active enantiomer of citalopram, without the QTc restriction) are preferred over citalopram by most guidelines. Consult your healthcare provider for personalized guidance.