METHYLPHENIDATE ASSOCIATED WITH NARCOTICS FOR THE TREATMENT OF CANCER PAIN

Abstract

Thirty-two patients with chronic pain due to advanced cancer were treated with methylphenidate (10 mg with breakfast and 5 mg with lunch) for 3 days, versus placebo, in a randomized, double-blind, cross-over study designed to evaluate the capacity of methylphenidate to potentiate the analgesic effect of narcotics and/or to decrease sedation inducted by narcotics. In 28 evaluable patients, the intensity of pain (visual analogue 0-100) and intake of extra doses of analgesics (number of doses/day) were 43 .+-. 27 and 2.2 .+-. 2.4 during methylphenidate versus 55 .+-. 24 (P < 0.02) and 2.9 .+-. 2.9 (P < 0.002) during placebo, respectively. Activity and drowsiness (visual analogue 0-100) were 57 .+-. 25 and 58 .+-. 24 after methylphenidate, respectively, versus 41 .+-. 26 (P < 0.05) and 45 .+-. 27 (P < 0.02) after placebo. Upon completion of the study, the investigator and the patient chose methylphenidate blindly as a more useful drug in 23 cases (83%) and 20 cases (70%), respectively (P < 0.02). No cases of severe toxicity were observed. We conclude that methylphenidate can increase the analgesic effect and decrease sedation of narcotics in this population.