Viagra is a medication used to treat erectile dysfunction (ED) in men. It is a phosphodiesterase type 5 (PDE5) inhibitor, which means it works by increasing blood flow to the penis. This can help men achieve and maintain an erection. Viagra is available in tablet form and is typically taken about an hour before sexual activity.
Viagra is a safe and effective medication for most men. However, it is important to talk to a doctor before taking Viagra, as it may not be appropriate for everyone. For example, Viagra should not be taken by men who are taking nitrates, as this can cause a dangerous drop in blood pressure. Viagra should also not be taken by men who have certain heart conditions or who have recently had a stroke.