Diproqualone is a quinazolinone class GABAergic and is an analogue of methaqualone developed in the late 1950s by a team at Nogentaise de Produits Chimique.

Diproqualone is used primarily for treating inflammatory pain associated with osteoarthritis and rheumatoid arthritis and more rarely, for treating insomnia, anxiety and neuralgia.

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.

So, it is not sold as a pure drug but only as the camphosulfonate salt in combination mixtures with other medicines such as ethenzamide.