When sildenafil was first developed in the late 1980s, there were high hopes that it would help to treat angina.The drug, which was synthesised at 's lab in Sandwich, Kent, was put through a series of clinical trials, but the results were disappointing.It was only in 1993 - when experts were considering giving up on the project - that a rather welcome side effect was spotted in a trial in Merthyr Tydfil, Wales.
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