Zoloft vs. Paxil

See how Zoloft and Paxil compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Zoloft and Paxil are both SSRIs used for depression and anxiety disorders, but Paxil is also FDA-approved for generalized anxiety disorder while Zoloft is not.

  • Zoloft's longer half-life tends to make missed doses and stopping treatment more forgiving than Paxil's shorter half-life.

  • Both drugs carry the same boxed warning about suicidal thoughts in young people and commonly cause nausea, dry mouth, and sexual side effects.

Zoloft vs. Paxil Drug Summary

Zoloft

Zoloft (sertraline) is a selective serotonin reuptake inhibitor (SSRI) used to treat major depressive disorder, obsessive-compulsive disorder, panic disorder, PTSD, social anxiety disorder, and premenstrual dysphoric disorder. It comes as a tablet or oral solution taken once daily, usually starting at 25 to 50 mg. Its relatively long half-life means an occasional missed dose is less likely to cause noticeable withdrawal effects.

Paxil

Paxil (paroxetine) is also an SSRI, FDA-approved for major depressive disorder, OCD, panic disorder, social anxiety disorder, generalized anxiety disorder, and PTSD. It is taken once daily as an immediate-release tablet, extended-release tablet (Paxil CR), or oral suspension, typically starting around 20 mg. Its short half-life means stopping abruptly or missing doses can bring on more noticeable discontinuation symptoms.

Zoloft vs. Paxil Side Effects

Zoloft

Most common
nausea (up to 26%)
dry mouth (up to 14%)
insomnia (up to 20%)
diarrhea (up to 20%)

Paxil

Most common
nausea (up to 26%)
dry mouth (up to 18%)
somnolence (up to 23%)
asthenia (up to 15%)

Zoloft vs. Paxil Dosage

Zoloft

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 25-50 mg once daily At the start
Maximum dose 50-200 mg once daily If needed
Dose changes 2 increases As tolerated

Paxil

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily At the start
Maximum dose 50 mg once daily If needed
Dose changes 3 increases As tolerated

Zoloft vs. Paxil Indications

Zoloft

Zoloft is FDA-approved for major depressive disorder, obsessive-compulsive disorder, panic disorder, PTSD, and social anxiety disorder. It works by boosting serotonin levels in the brain to help regulate mood and reduce anxious or compulsive symptoms. It is not FDA-approved for generalized anxiety disorder, though doctors sometimes prescribe it off-label for that purpose.

  • Major depressive disorder (MDD)

  • Obsessive-compulsive disorder (OCD)

  • Panic disorder

  • Posttraumatic stress disorder (PTSD)

  • Social anxiety disorder

Paxil

Paxil is FDA-approved for major depressive disorder, obsessive-compulsive disorder, panic disorder, social anxiety disorder, and generalized anxiety disorder. It works the same way, by increasing serotonin activity in the brain to ease depression and anxiety symptoms. It is not approved for use in children or teenagers.

  • Major depressive disorder (MDD)

  • Obsessive-compulsive disorder (OCD)

  • Panic disorder

  • Social anxiety disorder

  • Generalized anxiety disorder (GAD)

Zoloft vs. Paxil Pros and Cons

Zoloft

Sertraline (Zoloft) is one of the most widely prescribed SSRIs, with a long half-life that makes it more forgiving of missed doses. It carries the same boxed warning for suicidal thoughts as other antidepressants and shares typical SSRI side effects like nausea and sexual dysfunction.

Pros

  • Longer half-life makes missed doses and tapering off more forgiving than paroxetine.

  • The only SSRI of the two that is FDA-approved for premenstrual dysphoric disorder (PMDD).

  • Weaker CYP2D6 inhibition means fewer dose adjustments needed for other medications.

Cons

  • Not FDA-approved for generalized anxiety disorder, so that use is off-label.

  • GI side effects like nausea and diarrhea are common, especially in the first weeks.

  • Sexual side effects, including ejaculation difficulty, affect a meaningful share of men.

Paxil

Paroxetine (Paxil) treats a similarly broad range of anxiety and depressive disorders, with FDA approval for generalized anxiety disorder that sertraline lacks. Its short half-life means withdrawal symptoms can be more noticeable if a dose is missed or the medication is stopped abruptly.

Pros

  • FDA-approved for generalized anxiety disorder, an indication sertraline lacks.

  • Also available as an extended-release tablet (Paxil CR) or oral suspension.

  • Its sedating effect can help patients whose anxiety or depression includes prominent insomnia.

Cons

  • Short half-life means missed doses or stopping treatment can trigger more noticeable withdrawal symptoms.

  • Strong CYP2D6 inhibitor, requiring dose adjustments for many commonly co-prescribed drugs.

  • Not approved for use in pediatric patients, unlike some of sertraline's indications.

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