Sildenafil is available by the name Viagra and other names is a drug that is used to treat sexual dysfunction and hypertension of the pulmonary artery. It's not known whether it's effective in treating female sexual dysfunction. It is administered by mouth as well as injected into veins. The initial effect is usually within 20 minutes and is usually for 2 hours.
Common adverse effects are headaches, heartburn, and skin flushes. Beware of those suffering from cardiovascular disease. Some of the rare but severe side effects can be an extended erection (priapism) that could cause injury to penis tissue, vision issues as well as hearing loss. Sildenafil is not recommended by those who are taking nitrates, like nitroglycerin (glycerin trinitrate) since this could cause a drastic decrease in blood pressure. Sildenafil is not recommended to be taken within 4 hours after having the alpha-blocker.