Back to Medicines A to Z. Sildenafil is a medicine used to treat erectile dysfunction. It increases blood flow to the penis to help men get an erection. At least two-thirds of men have improved erections after taking it.
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Medically reviewed by C. Fookes, BPharm Last updated on Jun 11, Erection problems are common and an occasional problem achieving an erection is normal.
Erectile dysfunction drugs are effective for many men — but they aren't for everyone. Find out if they're safe for you. Please enter a valid email address. Erectile Dysfunction Erectile Dysfunction: Diagnosis Your doctor might perform a combination of different exams to determine if you have erectile dysfunction ED.