title: Effects of on-demand versus fixed-interval schedules in the treatment of chronic pain with analgesic compounds.
mesh_terms: D000328:Adult; D000368:Aged; D000700:Analgesics / Q000008:administration & dosage*; D002908:Chronic Disease; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000188:drug therapy* / Q000523:psychology
chemical_list: D000700:Analgesics