 Methyprylon was withdrawn from the US market in June 1975 and the Canadian market in September 1990.Some other trade names are Noctan and Dimerin.Side effects can include skin rash, fever, depression, ulcers or sores in mouth or throat, unusual bleeding or bruising, confusion, fast heartbeat, respiratory depression, swelling of feet or lower legs, dizziness, drowsiness, headache, double vision, clumsiness, constipation, diarrhea, nausea, vomiting, unusual weakness.