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Viagra is a prescription drug intended for patients with male impotence (erectile dysfunction). Taking Viagra with drugs prescribed for angina (nitrate drugs) can lead to fainting, sudden decrease of blood pressure and even death. At least 24 hours should pass between the two doses of Viagra. If you have or ever had a heart attack, stroke, heart rhythm disorder, liver or kidney disease, blood cell disorder, sickle cell anemia, coronary artery disease, congestive heart failure, high or low blood pressure, or a physical deformity of the penis talk to your doctor about taking Viagra as some of these conditions may be a contraindication. Viagra may be taken up to 4 hours before sexual activity, but it’s recommended to take it half an hour before having sex.

In some cases patients report priapism – a prolonged (over 4 hours) and painful erection. You need to seek emergency medical help as permanent damage to the tissues of penis is possible. Just like any erectile dysfunction treatment drug Viagra has been reported to contribute to a very rare side effect – sudden vision loss. This side effect has occurred in people with pre-existing eye problems and other health conditions, such as diabetes, high blood pressure, high cholesterol, and those older than 50. If you experience sudden vision loss stop taking this medicine and seek emergency medical help.

Brand names: Viagra, Revatio

Generic names: Sildenafil citrate