SSRI Comparison
Zoloft vs Lexapro
A side-by-side look at sertraline and escitalopram — two of the most prescribed SSRIs — covering approved indications, available strengths, drug interactions, and key clinical differences.
Sertraline HCl
Zoloft
sertraline hydrochloride
Strengths
25 mg · 50 mg · 100 mg
Half-life
~26 hours
Formulations
Tablet, oral solution
CYP inhibition
Moderate CYP2D6
Generic
Yes
Common imprints
ZOLOFT 50
ZOLOFT 100
GG 550
LU D03
Escitalopram
Lexapro
escitalopram oxalate
Strengths
5 mg · 10 mg · 20 mg
Half-life
~27–32 hours
Formulations
Tablet, oral solution
CYP inhibition
Minimal (weak CYP2D6)
Generic
Yes
Common imprints
FL 10
FL 20
E 11
5852
Key Differences at a Glance
Approved Indications
Zoloft has the broader label — MDD, OCD, panic disorder, PTSD, social anxiety, and PMDD. Lexapro is approved for MDD and GAD only (OCD/PTSD use is off-label).
SERT Selectivity
Lexapro (escitalopram) is the S-enantiomer of citalopram and has the highest selectivity for the serotonin transporter of any SSRI — a property linked to its clean interaction profile.
Drug Interactions
Lexapro has the fewest drug-drug interactions of any SSRI. Zoloft is a moderate CYP2D6 inhibitor, which can affect levels of other medications metabolized by that enzyme.
GI Tolerability
Zoloft tends to produce more GI side effects (particularly diarrhea) at higher strengths. Both cause initial nausea that typically resolves. Lexapro is generally considered well-tolerated.
Side-by-Side Comparison
| Feature | Zoloft | Lexapro |
|---|---|---|
| Drug class | SSRI | SSRI |
| Active ingredient | Sertraline HCl | Escitalopram oxalate |
| Available strengths | 25 mg 50 mg 100 mg | 5 mg 10 mg 20 mg |
| Half-life | ~26 hours | ~27–32 hours |
| FDA-approved uses | MDD, OCD, panic disorder, PTSD, social anxiety disorder, PMDD | MDD, generalized anxiety disorder (GAD) |
| CYP interactions | Moderate CYP2D6 inhibitor | Minimal — weak inhibitor |
| SERT selectivity | High | Highest of any SSRI |
| QT prolongation risk | Minimal label concern | Label carries note; lower risk than citalopram |
| Liquid formulation | Yes (oral solution available) | Yes (oral solution available) |
| Generic available | Yes | Yes |
| Notable | Most prescribed SSRI; longest track record; broadest approved indications | Considered "cleanest" SSRI; fewest drug interactions; highly selective |
Frequently Asked Questions
Is Zoloft or Lexapro better for anxiety?
Both are effective for anxiety, and both are widely prescribed for anxiety conditions. Lexapro (escitalopram) is specifically FDA-approved for generalized anxiety disorder (GAD) and is often a first-line choice for that diagnosis. Zoloft (sertraline) holds approvals for social anxiety disorder, panic disorder, and PTSD — making it more broadly indicated across anxiety subtypes. The best fit depends on your specific diagnosis, medical history, and how you respond. Your prescriber will weigh these factors individually.
Which has fewer side effects — Zoloft or Lexapro?
Lexapro is frequently cited for its favorable tolerability, a result of its high SERT selectivity and minimal off-target activity. It also carries the fewest drug-drug interactions of any SSRI. Zoloft tends to produce more GI effects — particularly diarrhea — especially at higher strengths. Both medications cause similar rates of sexual dysfunction and initial nausea, which typically resolves after the first few weeks. Individual responses vary considerably, and what one person tolerates easily another may not.
Which is better for OCD — Zoloft or Lexapro?
Zoloft (sertraline) is FDA-approved for obsessive-compulsive disorder (OCD). Lexapro does not carry an OCD indication, though it is sometimes used off-label. If OCD is the primary condition, sertraline has the stronger regulatory backing and more clinical trial data in that specific context.
Can you switch from Zoloft to Lexapro, or vice versa?
Yes — switching between SSRIs is a routine clinical practice because they share the same basic mechanism. A prescriber may taper one while starting the other, or make a more direct transition depending on the situation. The transition is generally well-tolerated, but should always be managed by a clinician. Never stop or change an antidepressant without guidance from your prescriber.
Which causes more weight gain — Zoloft or Lexapro?
Both are associated with modest weight gain over time, especially with long-term use. Some studies suggest escitalopram (Lexapro) may be associated with slightly more weight gain than sertraline (Zoloft), though the differences are small and the evidence is mixed. Neither is considered high-risk compared to paroxetine (Paxil), which has a stronger association with weight gain among SSRIs. Diet, lifestyle, and individual metabolism play a larger role than which SSRI is prescribed.
Medical disclaimer — This page is for informational and pill identification reference purposes only. It does not constitute medical advice and is not a substitute for consultation with a licensed healthcare provider. Drug information can change; always verify with current prescribing information or a pharmacist. Never start, stop, or change a medication based on information found here.