title: Approaches to chronic headache.
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage; D000929:Antidepressive Agents, Tricyclic / Q000627:therapeutic use; D002908:Chronic Disease; D003027:Cluster Headache / Q000188:drug therapy; D004359:Drug Therapy, Combination; D004878:Ergotamine; D004879:Ergotamines / Q000008:administration & dosage; D006261:Headache / Q000188:drug therapy* / Q000517:prevention & control; D006801:Humans; D008881:Migraine Disorders / Q000188:drug therapy; D011241:Prednisone / Q000008:administration & dosage; D012017:Referral and Consultation
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000929:Antidepressive Agents, Tricyclic; D004879:Ergotamines; D004878:Ergotamine; D011241:Prednisone