Zoloft vs Paxil: side-by-side comparison
Zoloft (Sertraline) and Paxil (Paroxetine) both belong to the Anti-Depressants class. They share clinical context but use different active ingredients. The choice between them depends on mechanism nuances, side-effect profile and individual response.
| Property | Zoloft | Paxil |
|---|---|---|
| Active ingredient | Sertraline | Paroxetine |
| Manufacturer | Pfizer | GlaxoSmithKline |
| Class | Anti-Depressants | Anti-Depressants |
| Strengths | 25mg, 50mg, 100mg | 10mg, 20mg, 30mg, 40mg |
| Forms | tablet | tablet |
What's the same
Zoloft and Paxil both belong to the Anti-Depressants class and are used for partially overlapping indications. The active ingredients — Sertraline vs Paroxetine — share the same therapeutic approach, so many safety and management points carry across both.
Key differences
Meaningful differences are in active ingredient (Sertraline vs Paroxetine), strengths (25mg, 50mg, 100mg vs 10mg, 20mg, 30mg, 40mg), forms (tablet vs tablet), and the mechanism, half-life and side-effect nuances that distinguish members of the class.
Mechanism and action
Zoloft: Sertraline acts by selectively blocking the serotonin transporter, preventing serotonin reuptake from the synaptic cleft and increasing synaptic serotonin concentration. Paxil: Paroxetine selectively inhibits the serotonin reuptake transporter (SERT), increasing synaptic serotonin availability.
When Zoloft is preferred
Zoloft is approved in adults for major depressive disorder, panic disorder with or without agoraphobia, obsessive-compulsive disorder, post-traumatic stress disorder, social anxiety disorder, and premenstrual dysphoric disorder.
When Paxil is preferred
Paxil is approved for major depressive disorder, generalised anxiety disorder, social anxiety disorder, panic disorder, obsessive-compulsive disorder and post-traumatic stress disorder, with regional variation.
Frequently asked questions
Is Zoloft or Paxil better? ▾
There is no single answer. Zoloft and Paxil both belong to the Anti-Depressants class but differ in mechanism nuances, half-life and side-effect profile. Preference depends on the patient, the prescriber and prior response to other therapies.
Can I switch from Zoloft to Paxil? ▾
Switching within the Anti-Depressants class is done under supervision, typically using equivalent doses and a follow-up period to confirm response and tolerance. It is not a self-directed decision.
Do Zoloft and Paxil have the same side effects? ▾
They share many of the Anti-Depressants class side effects, with differences from mechanism and dose. Each medication's prescribing information lists specifics.
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The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.