Viagra is so popular that its name has become synonymous with ED treatment — just like Ziploc has with plastic bags. But the active ingredient in Viagra is sildenafil. Pfizer Pharmaceuticals patented ...

Sildenafil, which is also called sildenafil citrate, comes as an oral tablet. The drug also comes as an oral liquid suspension and IV infusion. However, this article does not cover these forms. It ...

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 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.