Emotionally unstable patients or those w/ history of narcotic abuse. Abrupt w/drawal during chronic use. Presence of head injury, intracranial lesions or preexisting increase in intracranial pressure. Concomitant use w/ narcotic analgesic, general anesth, phenothiazines or other tranquilizers, sedatives, hypnotics or other CNS depressants (including alcohol). Impaired respiration; renal or hepatic function. May impair ability to drive or operate machinery. Pregnancy & lactation.