Thirty years ago, drug users flocked to a website called Erowid to describe experiences on everything from Advil to LSD. Today it's become a goldmine for researchers and governments.

"I am melting, help me." This is not only an unusual plea for assistance. It's also the title of a "trip report": one person's experience with the powerful dissociative drug phencyclidine (known as PCP). And it's just one of many thousands of mind-bending anecdotes filed to Erowid, a website that, since the early days of the internet, has built one of the world's most influential records of drug use and its effects.

This year marks the 30th anniversary of the scrappy, grassroots project, which hosts data on everything from caffeine to cannabis to paracetamol (also known as Tylenol) to heroin, like a Wikipedia on all things pharmaceutical. Users post information about purifying street drugs, rolling joints and the health implications of drug misuse. Visitors to the site can find information about drug toxicology and interactions between chemicals. They can even wade through the archives of , the Swiss chemist who first synthesised lysergic acid diethylamide – or LSD.