Sildenafil (Viagra)

Viagra © Pfizer
Image by SElefant (CC BY-SA 3.0)

Better known by its brand name of Viagra, sildenafil is a medication used for the treatment of impotence (inability to obtain erection of the penis). After the medication is taken, it may take one to four hours to be effective, and its effect may last up to 12 hours. An erection does not occur just because the tablet is taken, sexual stimulation is also necessary.

It must never be taken by patients with heart disease or angina, while taking nitrate drugs (eg. glyceryl trinitrate) used for angina, or in patients with liver disease, high or low blood pressure or with a history of a recent stroke. Side effects may include headache, flushing, blue haze in vision and indigestion.

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