Viagra (sildenafil): Side effects, dosage, how long it lasts

Learn about uses, how it works, and more for Viagra (sildenafil). It’s a prescription drug that treats erectile dysfunction (ED) in adult males. Viagra is a drug that relaxes blood vessels and treats erectile dysfunction in men. Learn about its warnings, interactions, side effects, and how to take it safely and effectively. See more viagra effects on man Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where this enzyme Viagra reaches its maximum concentration in the bloodstream within one to two hours. This is the time frame during which Viagra exerts its optimal effects. After two to three hours, the effects start to diminish. Viagra does not work in the absence of sexual stimulation or interest.

Like all medicines, sildenafil can cause side effects, although not everyone gets them. Common side effects. Common side effects of sildenafil happen in more than 1 in 100 Serious side effects of Viagra include low blood pressure and abnormal ejaculation. Viagra may cause prolonged erections or priapism (painful erections lasting more than 6 viagra and side effects This medicine can cause serious side effects in patients with heart problems. If you experience a prolonged or painful erection for 4 hours or more, contact your doctor immediately. This condition may require prompt medical treatment to prevent serious and permanent damage to your penis. Sildenafil oral tablet is available as a brand-name drug and as a generic drug. Brand names: Viagra, Revatio. Sildenafil comes in three forms: an oral tablet, an oral suspension (liquid), and an