Methaqualone: tolerance and physical dependence in mice.

Tolerance and physical dependence was produced in C57Bl/6 male mice that had been exposed, for 36 days, to methaqualone in food pellets via an automated system. Tolerance was revealed in the reduction of sleep-times following intraperitoneal injection of methaqualone. Physical dependence was manifested as an alteration in neural sensitivity to flurothyl-induced convulsions.