is a drug
which was widely prescribed as a sedative in the 1960s and 1970s under the brand name "Quaalude". It became a popular recreational drug, used largely by teenagers, leading to it being pulled from the market and reclassified in the U.S. as of 1984 under Schedule I (wide potential for abuse, no currently accepted medical use) along with the likes of heroin
While it is no longer widely encountered in the U.S. it is a popular illegal drug in South Africa where it is called Mandrax and is usually smoked off tin foil.
once wrote a novel on this subject.