• The relationship between propranolol and 4-hydroxypropranolol plasma concentrations and relief of migraine was assessed in 17 patients during treatment with oral racemic propranolol hydrochloride in doses of 40 to 240 mg /day. Propranolol decreased the migraine index more than 70% in 13 patients: five patients at a dosage of 40 mg/day, five patients at a dosage of 120 mg/day, and three patients at a dosage of 240 mg/ day. Three patients did not achieve a good improvement of migraine at any of the doses used. The relief of migraine was not directly related to the propranolol and 4-hydroxypropranolol plasma concentrations.
Cortelli P, Sacquegna T, Albani F, et al. Propranolol Plasma Levels and Relief of Migraine: Relationship Between Plasma Propranolol and 4-Hydroxypropranolol Concentrations and Clinical Effects. Arch Neurol. 1985;42(1):46–48. doi:10.1001/archneur.1985.04060010052015
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