Prozac vs. Celexa

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

Key Takeaways

  • Prozac is FDA-approved for depression, OCD, bulimia, panic disorder, and treatment-resistant depression, while Celexa is approved only for major depressive disorder in adults.

  • Prozac's long half-life allows a once-weekly maintenance dose, while Celexa is taken once daily with a maximum dose of 40 mg because of heart rhythm risks.

  • Both drugs carry a boxed warning for suicidal thoughts in young people, but Celexa has a stricter QT prolongation warning that limits dosing in older adults.

Prozac vs. Celexa Drug Summary

Prozac

Prozac (fluoxetine) is an SSRI used to treat major depressive disorder, OCD, bulimia, panic disorder, and treatment-resistant depression when combined with olanzapine. It is available as a capsule, weekly delayed-release capsule, tablet, or oral solution, usually starting at 20 mg daily.

Celexa

Celexa (citalopram) is an SSRI approved for major depressive disorder in adults, and it's also used off-label for anxiety-related conditions. It is taken once daily as a tablet or oral solution, typically starting at 20 mg and increasing to a 40 mg maintenance dose after one week.

Prozac vs. Celexa Side Effects

Prozac

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

Celexa

Most common
insomnia (up to 15%)
nausea (up to 21%)
somnolence (up to 18%)
dry mouth (up to 20%)

Prozac vs. Celexa 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

Celexa

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 20 mg once daily Week 1
Maximum dose 40 mg once daily Week 2 onward
Dose changes 1 increase Every week

Prozac vs. Celexa Indications

Prozac

Prozac is FDA-approved for major depressive disorder, OCD, bulimia nervosa, and panic disorder. It's also approved with olanzapine for bipolar I depression and treatment-resistant depression.

  • Major depressive disorder

  • Obsessive-compulsive disorder (OCD)

  • Bulimia nervosa

  • Panic disorder

Celexa

Celexa is FDA-approved only for major depressive disorder in adults. Off-label, it is commonly prescribed for generalized anxiety disorder, panic disorder, and OCD, though these uses are not FDA-approved.

  • Major depressive disorder (FDA-approved)

  • Generalized anxiety disorder (off-label)

  • Panic disorder (off-label)

  • Obsessive-compulsive disorder (off-label)

Prozac vs. Celexa Pros and Cons

Prozac

Prozac has the broadest range of FDA-approved uses among SSRIs, covering depression, OCD, bulimia, and panic disorder. Its long half-life means missed doses are less likely to cause withdrawal, though the drug also clears slowly if side effects occur.

Pros

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

  • Once-weekly maintenance dosing option after initial daily dosing

  • Long half-life makes missed doses less likely to cause withdrawal

  • Only SSRI approved with olanzapine for treatment-resistant depression

Cons

  • More CYP450 drug interactions than many other SSRIs

  • Long half-life means it takes longer to clear if side effects occur

  • Can be activating, causing insomnia or anxiety in some patients

Celexa

Celexa has a simple once-daily dosing schedule and decades of clinical use behind it. Its main drawback is a firm dose ceiling caused by dose-dependent QT prolongation, which limits flexibility for patients who might need higher doses.

Pros

  • Simple once-daily dosing without a weekly step-up option

  • Long track record of use with a well-established safety profile

  • Fewer CYP450 interactions than some other SSRIs

  • Commonly used off-label for anxiety disorders

Cons

  • Maximum dose capped at 40 mg/day due to QT prolongation risk

  • Dose limited to 20 mg/day in older adults or poor metabolizers

  • No FDA-approved uses beyond major depressive disorder

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