Quaalude: trademark for a sedative-hypnotic (methaqualone). It is no longer distributed in the United States.

Additional information:

Quaaludes (Methaqualone): Quaalude, 'ludes' Substance abuse An addictive Schedule II hypnotic-sedative quinazolone with barbiturate-like effects; methaqualone was a popular drug of abuse and linked to physical or psychologic dependence Clinical Delirium, headache, nausea, pyramidal signs, convulsions, renal and cardiac failure; rarely, aplastic anemia Route Oral, injected, sniffed, smoked Used for Anxiety, tension Management Hemoperfusion