amobarbital: a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant
barbiturate: organic compound having powerful soporific effect; overdose can be fatal
opportunistic infection: any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs)