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In 1991, healthy volunteers took part in clinical trials to test the safety of Viagra and how the body metabolised the compound.

These showed that it was safe. In trials over 10 days, the healthy volunteers reported some unexpected side effects. Male volunteers reported more frequent erections after taking the Angina medicine!

Erectile dysfunction

Following the unusual side effects seen in the volunteer trials, researchers switched to looking into using Viagra to treat Erectile dysfunction (ED). This serious condition causes psychological and emotional problems that affects many families.

Research into using Viagra to treat angina continued but the medicine did not prove powerful enough to be really useful.

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