Zoloft vs. Prozac
See how Zoloft and Prozac compare on approved uses, dosing, side effects, and cost.
Medically reviewed by Lauren Okafor | MD, The Frank H Netter MD School of Medicine, Loyola University Medical Center on August 23rd, 2026.
Key Takeaways
Both drugs are SSRIs for depression and related conditions, but Zoloft is FDA-approved for PTSD and social anxiety disorder while Prozac is not.
Prozac's long-acting metabolite lowers the risk of withdrawal symptoms if a dose is missed, while Zoloft's shorter half-life means doses must be taken more consistently.
Zoloft is dosed once daily within a 25-200 mg range, while Prozac offers daily dosing plus a once-weekly maintenance option after stabilization.
Zoloft vs. Prozac Drug Summary
Zoloft
Zoloft (sertraline) is a selective serotonin reuptake inhibitor (SSRI) used for major depressive disorder, OCD, panic disorder, PTSD, social anxiety disorder, and PMDD. It is a once-daily tablet or oral solution, usually starting at 25-50 mg and increasing weekly up to 200 mg.
Prozac
Prozac (fluoxetine) is a selective serotonin reuptake inhibitor (SSRI) used for major depressive disorder, OCD, bulimia nervosa, panic disorder, and treatment-resistant or bipolar depression when combined with olanzapine. It is a once-daily capsule, tablet, or oral solution, with a once-weekly capsule option after stabilizing on the daily dose.
Zoloft vs. Prozac Side Effects
Zoloft
Prozac
Zoloft vs. Prozac Dosage
Zoloft
Prozac
| 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 |
| STAGE | DOSE | WHEN |
| Starting dose | 20 mg once daily | At the start |
| Maximum dose | 90 mg once weekly | If needed |
| Dose changes | 2 increases | As tolerated |
Zoloft
| 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 |
Prozac
| STAGE | DOSE | WHEN |
| Starting dose | 20 mg once daily | At the start |
| Maximum dose | 90 mg once weekly | If needed |
| Dose changes | 2 increases | As tolerated |
Zoloft vs. Prozac Indications
Zoloft
Zoloft is FDA-approved for major depressive disorder, OCD, panic disorder, PTSD, social anxiety disorder, and premenstrual dysphoric disorder. Some doctors also prescribe it off-label for generalized anxiety disorder.
Major depressive disorder (MDD)
Obsessive-compulsive disorder (OCD)
Panic disorder
Post-traumatic stress disorder (PTSD)
Premenstrual dysphoric disorder (PMDD)
Prozac
Prozac is FDA-approved for major depressive disorder, OCD, bulimia nervosa, panic disorder, and, combined with olanzapine, bipolar I depression or treatment-resistant depression. It is also used off-label for premenstrual symptoms and binge eating disorder.
Major depressive disorder (MDD)
Obsessive-compulsive disorder (OCD)
Bulimia nervosa
Panic disorder
Bipolar I depression (with olanzapine)
Zoloft vs. Prozac Pros and Cons
Zoloft
Zoloft covers a broader range of FDA-approved anxiety indications than Prozac, including PTSD and social anxiety disorder, alongside its own approval for PMDD. Its shorter half-life allows faster dose adjustments but requires strict daily dosing to avoid withdrawal symptoms.
Pros
FDA-approved for PTSD and social anxiety disorder, indications not on fluoxetine's label
Approved specifically for PMDD, with continuous or luteal-phase-only dosing options
Shorter half-life clears the body faster, simplifying switches to other medications or an MAOI
Reaches steady state in about a week, so dose changes can happen faster than with fluoxetine
Cons
Carries a moderate risk of discontinuation symptoms if doses are missed, due to its shorter half-life
Not approved for bulimia nervosa or as an add-on for treatment-resistant depression, unlike fluoxetine-olanzapine
No once-weekly maintenance dosing option; requires daily dosing without exception
Reports a higher rate of diarrhea in trials (up to 20%) than fluoxetine (up to 12%)
Prozac
Prozac's long half-life makes it more forgiving of missed doses and is the only SSRI approved with olanzapine for treatment-resistant and bipolar I depression. It also carries a specific approval for bulimia nervosa that sertraline does not have.
Pros
Long-acting metabolite gives one of the lowest risks of withdrawal symptoms among SSRIs if a dose is missed
Only SSRI approved in combination with olanzapine for treatment-resistant depression and bipolar I depression
Approved specifically for bulimia nervosa, an indication sertraline does not carry
Offers a once-weekly maintenance dosing option after stabilizing on the daily dose
Cons
Not approved for PTSD or social anxiety disorder, indications carried by sertraline
Takes about a month to reach steady state, making dose changes slower than with sertraline
Long half-life means it takes weeks to fully clear the body, complicating switches to other medications or an MAOI
PMDD treatment with Prozac is off-label; sertraline carries a specific FDA approval for that use
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