Viagra drug name?

What is the generic drug name for Viagra?

Viagra’s generic drug name is sildenafil.[1]

What brand names are sildenafil sold under?

Sildenafil is sold under other brand names in different countries, but Viagra is the best-known brand in many markets. The active ingredient in all cases is sildenafil.[1]

What type of medicine is sildenafil (Viagra)?

Sildenafil belongs to the class of medicines called PDE5 inhibitors, which are used mainly for erectile dysfunction and sometimes for pulmonary arterial hypertension.[1]

Sources:
[1] https://www.drugpatentwatch.com/