title: Paradoxical effects of frequent analgesic use.
mesh_terms: D000328:Adult; D000639:Amitriptyline / Q000037:antagonists & inhibitors / Q000627:therapeutic use; D000700:Analgesics; D004361:Drug Tolerance; D005260:Female; D006261:Headache / Q000188:drug therapy* / Q000209:etiology; D006801:Humans; D006993:Hypnotics and Sedatives; D008297:Male; D008881:Migraine Disorders / Q000188:drug therapy*; D009119:Muscle Contraction; D012535:Scalp; D019966:Substance-Related Disorders; D014149:Tranquilizing Agents
chemical_list: D000700:Analgesics; D006993:Hypnotics and Sedatives; D014149:Tranquilizing Agents; D000639:Amitriptyline