Checked against the current FDA label, named clinical trials, and the sources listed on this site.
01Adult major depressive disorder dosing
Adult Prozac for major depressive disorder starts at 20 mg taken in the morning. After several weeks the dose may be increased based on individual efficacy and tolerability. Doses above 20 mg may be given once daily in the morning or twice daily, morning and noon. The maximum recommended dose is 80 mg per day.
Sources and how this letter was sealed
FDA / Lilly, Prozac US PI: MAOI contraindications; 5-week and 14-day clocks; linezolid / methylene blue.
Method in brief: open primary sources, annotate against the current FDA label,
countersign by Dr. Nora Lindqvist, MD, then seal with a dated review.
Full walk-through on the method page and
editorial standards.
How to cite this page - Vancouver style
Juvia Pharma Drug Reference. Five weeks after the last fluoxetine capsule before an MAOI [Internet]. Stockholm: Juvia Pharma; 21 October 2026 [cited 2026 Aug 21]. Available from: https://juviapharma.com/postscripts/prozac-washout-switch/
Desk thread
Answers follow the U.S. Prozac prescribing information.
Hedda Strom, Harnosand writes
What is the labelled adult starting dose?
Desk reply
Adult Prozac for major depressive disorder starts at 20 mg taken in the morning. After several weeks the dose may be increased based on individual efficacy and tolerability. Doses above 20 mg may be given once daily in the morning or twice daily, morning and noon. The maximum recommended dose is 80 mg per day.
Jens Madsen, Esbjerg writes
Can doses above 20 mg be split through the day?
Desk reply
Adult Prozac for major depressive disorder starts at 20 mg taken in the morning. After several weeks the dose may be increased based on individual efficacy and tolerability. Doses above 20 mg may be given once daily in the morning or twice daily, morning and noon. The maximum recommended dose is 80 mg per day.
Paivi Koskinen, Kotka writes
What is the adult daily ceiling?
Desk reply
Adult Prozac for major depressive disorder starts at 20 mg taken in the morning. After several weeks the dose may be increased based on individual efficacy and tolerability. Doses above 20 mg may be given once daily in the morning or twice daily, morning and noon. The maximum recommended dose is 80 mg per day.
Before you start, stop, or change any medicine mentioned above, run it past your prescriber or pharmacist - they hold your chart, this despatch does not. Desk notice.
