Page last updated at 08:29 GMT, Wednesday, 20 January 2010

How Viagra works


Trials for a new drug known as UK92480 to treat the heart condition angina led by pure chance to the discovery of what we now know as Viagra. Pfizer's senior scientist Chris Wayman explains how it works.

Horizon: Pill Poppers can be seen on Wednesday 20 January at 9pm BBC Two and afterwards via BBC iPlayer

READ MORE: Viagra, an accidental drug story


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