Criteria for safe medicine use in older grownups -- for people over 65 years. Initially issued in 1991, these criteria being over repeatedly revised and updated. As well as the benzodiazepines, the Beers criteria (or number) has actually included amiodarone, amitriptyline, cimetidine, clonidine, disopyramide, indomethacin, ketorolac, meperidine, methyldopa, and many antihistamines, antispasmodics, and muscle relaxants. Named for Dr. M.H. Beers, principal writer of the initial 1991 criteria.