Methaqualone is a substance once prescribed as a sedative and hypnotic medication, under the brand names Quaalude and Mandrax among others, until commercial production was halted due to widespread abuse, among other things. It is a member of the quinazolinone class. 2-Methyl-3-o-tolyl-4(3H)-quinazolinone; 3,4-Dihydro-2-methyl-4-oxo-3-o-tolylquinazoline; 2-Methyl-3-(2-methylphenyl)-4-(3H)-quinazolinone FormulaC16H14N2O Molar mass250.30 g/mol g·mol−1 Melting point113 °C (235 °F)
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