Viagra que es is a prescription medicine used to treat erectile dysfunction (impotence) in men. It works by increasing blood flow to the penis. This helps men to get or maintain an erection. It belongs to a group of medicines known as PDE-5 inhibitors. Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems. Taking sildenafil with a nitrate medicine can cause a sudden and serious decrease in blood pressure. Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours.

Reviewer Keywords