Mecloqualone (Nubarene, Casfen) is an analogue of methaqualone that was first made in 1960 and marketed mainly in France and some other European countries. It has sedative, hypnotic, and anxiolytic properties, and was used for the treatment of insomnia. Mecloqualone is faster-acting but shorter-lasting than methaqualone and so was used only as a sleeping pill, in contrast to methaqualone, which was used as a general-purpose anxiolytic as well. Mecloqualone was never as widely used as methaqualone and is no longer prescribed because of concerns about its potential for abuse and overdose. In the United States it is a Schedule I non-narcotic (depressant) controlled substance with an ACSCN of 2572 and zero annual aggregate manufacturing quota. Is is most often seen these days as a component in purported Quāāludes (resulting from incomplete synthesis of methaqualone) from underground labs.