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
Celexa
Prozac vs. Celexa Dosage
Prozac
Celexa
| 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 |
| 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
| 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
| 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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