Viagra treats erectile dysfunction (ED) in adults. It’s usually taken about 1 hour before sexual activity. Viagra dosage is not based on weight, but your age can affect your dosage. Viagra comes as an ...

Viagra is a prescription tablet that’s used to treat erectile dysfunction in adults. It comes in three strengths (25 mg, 50 mg, and 100 mg) and is taken as needed up to 4 hours before sexual activity.

Viagra is available in 25-milligram (mg), 50-mg, and 100-mg doses, with the typical starting dose being 50 mg taken an hour before sexual activity. The maximum recommended dosage is 100 mg per day.