Many medicines begin life with one purpose and end up proving useful for a completely different reason.
Few areas show this more clearly than men's health. Three drugs in particular have become household names not because of their original uses, but because of what researchers later discovered they could do.
Their stories show how scientific serendipity, careful observation and patient experience can reshape modern medicine.
Sildenafil
Sildenafil is perhaps the most famous example of drug repurposing in modern medicine.
