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Viagra improves erections by increasing vasodilation of the spongy tissue in the penis and the arteries that supply it with blood. It achieves this by inhibiting the PDE enzyme which breaks down the signalling molecule cGMP.

By preventing this break down, Viagra enhances the natural mechanism involved in achieving and maintaining an erection. This helps to treat sufferers of erectile dysfunction.

Patients take a tablet containing 25, 50 or 100mg of Viagra around an hour before intercourse.

All medicines have side effects and Viagra is no exception. Reported effects include headaches, hot flushes and indigestion. It should not be taken by people who are also using nitrate-medicines for heart conditions. Viagra, like other medications, must only be taken following the advice of a doctor.

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