Prozac vs. Pristiq

See how Prozac and Pristiq compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Prozac (an SSRI) treats depression, OCD, bulimia, and panic disorder, while Pristiq (an SNRI) is FDA-approved only for major depressive disorder in adults.

  • Pristiq uses one fixed 50 mg daily dose, while Prozac requires titration and offers multiple formulations, including a once-weekly capsule.

  • Nausea is the most common side effect for both drugs, but Pristiq's rate (up to 41%) is notably higher than Prozac's (up to 21%).

Prozac vs. Pristiq Drug Summary

Prozac

Prozac is a selective serotonin reuptake inhibitor (SSRI) approved for major depression, OCD, bulimia nervosa, and panic disorder. It comes as a capsule, delayed-release weekly capsule, tablet, or liquid, typically starting at 20 mg once daily.

Pristiq

Pristiq is a serotonin-norepinephrine reuptake inhibitor (SNRI) approved for major depressive disorder in adults. It is taken as a single extended-release tablet once daily, with 50 mg serving as both the starting and target dose.

Prozac vs. Pristiq Side Effects

Prozac

Most common
insomnia (up to 33%)
nausea (up to 21%)
anxiety/nervousness (up to 15%)
diarrhea (up to 12%)

Pristiq

Most common
nausea (up to 41%)
dry mouth (up to 25%)
dizziness (up to 16%)
constipation (up to 14%)

Prozac vs. Pristiq Dosage

Prozac

Dosage
Dosage Table
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

Pristiq

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 50 mg once daily At the start
Maximum dose 50 mg once daily Same as starting
Dose changes None Fixed dose

Prozac vs. Pristiq Indications

Prozac

Prozac carries the broadest set of FDA approvals among SSRIs, covering major depression, OCD, bulimia nervosa, and panic disorder. It is also the only SSRI approved alongside olanzapine for bipolar depression and treatment-resistant depression.

  • Major depressive disorder

  • Obsessive-compulsive disorder (OCD)

  • Bulimia nervosa

  • Panic disorder

Pristiq

Pristiq is FDA-approved only for treating major depressive disorder in adults. It does not have additional approvals for anxiety disorders, OCD, or other conditions that broader-spectrum antidepressants sometimes treat off-label.

  • Major depressive disorder (MDD) in adults

  • Only FDA-approved indication for this drug

  • Not approved for children or teens

  • Same 50 mg dose used for most patients

Prozac vs. Pristiq Pros and Cons

Prozac

Prozac has one of the longest track records of any antidepressant, with FDA approvals spanning depression, OCD, bulimia, and panic disorder. Its long-acting active metabolite makes withdrawal symptoms less likely if a dose is missed, though the same property means it stays in the body longer if side effects need to resolve.

Pros

  • Approved for OCD, bulimia, and panic disorder, not just depression

  • Long half-life lowers withdrawal risk if a dose is missed

  • Available as capsule, tablet, liquid, and once-weekly capsule

Cons

  • Insomnia and anxiety are common and can feel activating early on

  • Cannot be combined with MAOIs, pimozide, or thioridazine

  • Not approved for generalized anxiety disorder as monotherapy

Pristiq

Pristiq is approved only for major depression in adults, with a simple one-dose regimen that skips the need for titration. As an SNRI, it also affects norepinephrine, which can produce side effects like sweating and dry mouth that differ from a typical SSRI profile.

Pros

  • Fixed 50 mg dose from day one, no titration schedule needed

  • Simple once-daily extended-release tablet

  • Higher doses showed no added benefit, simplifying dosing decisions

Cons

  • Approved only for MDD, a narrower range of uses than Prozac

  • Higher reported rates of nausea, dry mouth, and dizziness

  • Typically costs $400 to $543 a month, far more than generic Prozac

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