Diproqualone is the only analogue of methaqualone that is still in widespread clinical use, due to its useful anti-inflammatory and analgesic effects in addition to the sedative and anxiolytic actions common to other drugs of this class. There are still some concerns about the potential of diproqualone for abuse and overdose, and so it is not sold as a pure drug but only as the camphosulfonate salt in combination mixtures with other medicines such as ethenzamide.
^Audeval B, Bouchacourt P, Rondier J. Comparative study of diproqualone-ethenzamide versus glafenine for the treatment of rheumatic pain of gonarthrosis and coxarthrosis. (French) Gazette médicale de France 1988; 95(25):70-72