Disorders of the Nervous System Caused by Drugs, Toxins, and Chemical Agents, Opiates and Synthetic Analgesic Drugs
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Butorphanol (Stadol) :A Study in Problems of Current Drug Information and Control
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Chronic headache:Appropriate Use of Opiate Analgesics
Neurol 44:S18-S24, Markley,H.G., 1994
Abrupt Outpatient Withdrawal of Medication in Analgesic-Abusing Migraineurs
Lancet 337:1442-1443, Hering,T.&Steiner,T.J., 1991