Acute Trismus Follow Benzodiazepine Discontinuation in a Rural Addicted Patient

in this study it was introduced a ۳۴-year-old married man from a small city in the Southeastern area of Iran who was referred to a psychiatrist because of the restriction of the range of his jaw motion.The patient could not open his mouth within the normal range (۳۵ to ۵۵ mm; ۳-finger wide). He felt intolerable pain and had talking problems, eating, swallowing, and was highly emotional. Three finger test was positive. He had a history of using opium (۱ mg per day) and clonazepam (۱ mg every night) from ۱۰ years ago. He had a history of sudden drug withdrawal and has replaced the opium with ۲۰ mg of methadone tablet. He had no personal or family history of other illnesses. In his neurological checkup, a painful condition restricted optimal mandibular movement caused by masticating muscle spasms.