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Brand names: Viagra, Revatio

Generic names: Sildenafil citrate

Viagra (sildenafil) is a prescription medicine that belongs to the class of drugs called phosphodiesterase (PDE) inhibitors. Its effects are based on dilating the blood vessels in your penis, allowing more blood to flow in and providing for a stable erection that goes away once the sexual act is completed. If you have been prescribed this medicine, you are supposed to know that it is not likely to boost your libido or cause sexual desire by itself. This means that you will need to get sexually excited if you would like to feel the full benefits of taking Viagra. For maximum efficiency you are supposed to take Viagra 30-60 minutes before having sex, and it remains efficient during the next 4-5 hours. Do not take another dosage of this medicine within the next 24 hours.