Escitalopram vs. Fluoxetine
See how Escitalopram and Fluoxetine compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Both escitalopram and fluoxetine are SSRIs for major depressive disorder, but fluoxetine also covers OCD, panic disorder, and bulimia nervosa.
Escitalopram uses a simple once-daily dose that reaches its 20 mg target in about a week, while fluoxetine offers dose ranges up to 80 mg or a once-weekly 90 mg option.
Fluoxetine's active metabolite lingers in the body for weeks after stopping, while escitalopram clears faster and causes fewer drug interactions.
Escitalopram vs. Fluoxetine Drug Summary
Escitalopram
Escitalopram is a selective serotonin reuptake inhibitor (SSRI) approved to treat major depressive disorder in adults and adolescents 12 and older, as well as generalized anxiety disorder in adults. It is taken as a single daily tablet or oral solution, usually starting at 10 mg and increasing to 20 mg after one week.
Fluoxetine
Fluoxetine is also an SSRI, approved for major depressive disorder, obsessive-compulsive disorder, panic disorder, and bulimia nervosa, and in combination with olanzapine for bipolar depression. It comes as a capsule, tablet, or oral solution, usually starting at 10 mg daily and adjusted based on the condition being treated.
Escitalopram vs. Fluoxetine Side Effects
Escitalopram
Fluoxetine
Escitalopram vs. Fluoxetine Dosage
Escitalopram
Fluoxetine
| STAGE | DOSE | WHEN |
| Starting dose | 10 mg once daily | Week 1 |
| Maximum dose | 20 mg once daily | Week 2 onward |
| Dose changes | 1 increase | Every week |
| STAGE | DOSE | WHEN |
| Starting dose | 10 mg once daily | Week 1 |
| Maximum dose | 90 mg once weekly | If needed |
| Dose changes | 4 increases | Every week |
Escitalopram
| STAGE | DOSE | WHEN |
| Starting dose | 10 mg once daily | Week 1 |
| Maximum dose | 20 mg once daily | Week 2 onward |
| Dose changes | 1 increase | Every week |
Fluoxetine
| STAGE | DOSE | WHEN |
| Starting dose | 10 mg once daily | Week 1 |
| Maximum dose | 90 mg once weekly | If needed |
| Dose changes | 4 increases | Every week |
Escitalopram vs. Fluoxetine Indications
Escitalopram
Escitalopram is FDA-approved to treat major depressive disorder in adults and adolescents aged 12 to 17, and generalized anxiety disorder in adults. It is not approved for children under 12 or for bipolar depression.
Major depressive disorder in adults
Major depressive disorder in adolescents 12-17
Generalized anxiety disorder in adults
Fluoxetine
Fluoxetine is FDA-approved for major depressive disorder in adults and children as young as 8, obsessive-compulsive disorder in ages 7 and up, panic disorder, and bulimia nervosa in adults. It is also approved in combination with olanzapine for bipolar depression and treatment-resistant depression.
Major depressive disorder in adults and children 8-18
Obsessive-compulsive disorder in adults and children 7-17
Panic disorder in adults
Escitalopram vs. Fluoxetine Pros and Cons
Escitalopram
Escitalopram is generally well tolerated with a straightforward once-daily dosing schedule that reaches its target dose within about a week. It has fewer known drug interactions than fluoxetine because it does not strongly inhibit the liver enzymes that metabolize other medications.
Pros
Simple two-step dosing reaches target in about a week
Fewer drug interactions from weaker CYP2D6 inhibition
Approved for generalized anxiety disorder
Low-cost generic tablets and oral solution
Cons
Not approved for OCD, panic disorder, or bulimia
No once-weekly maintenance dosing option
Not approved for children under 12
No FDA-approved combination therapy for bipolar depression
Fluoxetine
Fluoxetine covers the widest range of FDA-approved uses among SSRIs, including OCD, panic disorder, and bulimia nervosa, and it can be combined with olanzapine for bipolar depression. Its long half-life allows a once-weekly maintenance option but also means it can linger in the body for weeks after stopping.
Pros
Approved for OCD, panic disorder, and bulimia nervosa
Once-weekly maintenance dosing option available
Approved for children as young as 8 for MDD
Decades of use and low-cost generic availability
Cons
Stronger CYP2D6 inhibition raises interaction risk
Long half-life delays clearance if side effects occur
Higher rates of insomnia and gastrointestinal side effects
Contraindicated with pimozide and thioridazine
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