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Sildenafil belongs to the phosphodiesterase (PDE) inhibitor class of drugs. It improves the circulation of blood during sexual stimulation, which helps to treat erectile dysfunction. An erection may result from increased blood flow. It helps to relax your penis' blood vessels. When sexually aroused, this increases the blood flow into the penis and causes an erection. If you are sexually excited, this drug will simply assist you to acquire an erection. It works well, but it must be taken nearly 30 minutes before any sexual activity.

If you're taking or have recently taken riociguat or nitrates (chest pain drugs) like isosorbide dinitrate, isosorbide mononitrate, or nitroglycerin, don't take sildenafil.

Talk to your doctor or dentist that you are getting sildenafil if you are getting surgery, including dental surgery.

If you've had a heart attack in the last three months, or a stroke or heart failure in the last six months, don't take it.