ProzacvsZoloft
Both are SSRI • Side-by-side comparison
Prozac vs Zoloft: Overview
Prozac (fluoxetine) and Zoloft (sertraline) are both selective serotonin reuptake inhibitors (SSRIs) and two of the most prescribed antidepressants worldwide. Prozac was the first SSRI approved by the FDA in 1987 and revolutionized depression treatment, while Zoloft followed in 1991. Both work by preventing the reabsorption of serotonin in the brain, but they differ in their half-life, approved indications, and side effect profiles. Prozac has an exceptionally long half-life (1-4 days, active metabolite up to 16 days), making it more forgiving if doses are missed and reducing discontinuation syndrome. Zoloft has a shorter half-life (26 hours) and is approved for more conditions, including PTSD and PMDD. Both have inexpensive generic versions.
Key Facts at a Glance
- ✓Prozac has an extremely long half-life (days) — very forgiving if doses are missed
- ✓Zoloft is approved for more conditions: depression, OCD, PTSD, panic, PMDD, social anxiety
- ✓Prozac approved for: depression, OCD, panic disorder, bulimia, bipolar depression (with olanzapine)
- ✓Zoloft causes more GI side effects initially; Prozac may cause more insomnia/agitation
- ✓Both have very affordable generics (fluoxetine and sertraline)
- ✓Prozac least likely of SSRIs to cause discontinuation syndrome due to long half-life
Prozac
Drug AUsed For
- ✓ Depression
- ✓ Anxiety
- ✓ OCD
Zoloft
Drug BUsed For
- ✓ Depression
- ✓ Anxiety
- ✓ OCD
Key Differences
Which Should You Choose?
Prozac is often preferred when patients have concerns about missing doses or stopping abruptly, due to its long half-life. Zoloft's broader range of FDA approvals makes it versatile for patients with comorbid anxiety disorders or PTSD. Both are first-line treatments for depression and anxiety. The best choice is highly individual — many patients switch between SSRIs before finding the one that works best for them with the fewest side effects.