25 years ago, Viagra kickstarted the second sexual revolution and a controversy unlike any drug before it. Following trials in 1992 for a compound believed to alleviate symptoms for angina, Pfizer’s first in-patient trial for the drug, then known as UK92480, begin in Merthyr Tydfil, south Wales. It isn’t long before volunteer patients report having unexpected erections - fast forward ten years and word of the adverse side effect has... see more