Checked against the current FDA label, named clinical trials, and the sources listed on this site.
01Most adults start at 50 mg
As-needed Viagra for ED starts at 50 mg taken about one hour before sexual activity. Viagra may be taken from 30 minutes to 4 hours before sexual activity. The as-needed dose may be 100 mg based on individual efficacy and tolerability. A 25 mg as-needed tablet may be used when a lower dose is needed. In most patients the maximum dosing frequency is once per day.
Sources and how this letter was sealed
FDA / Pfizer, Viagra US PI sections 2 and 7: 50 mg start, 25 mg considerations, ritonavir 25 mg / 48 h.
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. Viagra tablets are 25 mg, 50 mg, and 100 mg [Internet]. Stockholm: Juvia Pharma; 21 October 2026 [cited 2026 Aug 21]. Available from: https://juviapharma.com/postscripts/sildenafil-dose-ladder/
Desk thread
Answers follow the U.S. Viagra prescribing information.
Brita Holmgren, Pitea writes
Is 25 mg the real first dose for everyone?
Desk reply
As-needed Viagra for ED starts at 50 mg taken about one hour before sexual activity. Viagra may be taken from 30 minutes to 4 hours before sexual activity. The as-needed dose may be 100 mg based on individual efficacy and tolerability. A 25 mg as-needed tablet may be used when a lower dose is needed. In most patients the maximum dosing frequency is once per day.
Niko Saarinen, Oulu writes
I am 71. Must I start at 25 mg?
Desk reply
As-needed Viagra for ED starts at 50 mg taken about one hour before sexual activity. Viagra may be taken from 30 minutes to 4 hours before sexual activity. The as-needed dose may be 100 mg based on individual efficacy and tolerability. A 25 mg as-needed tablet may be used when a lower dose is needed. In most patients the maximum dosing frequency is once per day.
Folke Berg, Hudiksvall writes
What is the daily maximum?
Desk reply
As-needed Viagra for ED starts at 50 mg taken about one hour before sexual activity. Viagra may be taken from 30 minutes to 4 hours before sexual activity. The as-needed dose may be 100 mg based on individual efficacy and tolerability. A 25 mg as-needed tablet may be used when a lower dose is needed. In most patients the maximum dosing frequency is once 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.
