Presystemic and systemic glucuronidation of propranolol

Clinical Pharmacology and Therapeutics
T WalleT E Gaffney


The relative importance of presystemic and systemic glucuronidation of propranolol was examined in normal subjects given single oral and intravenous doses of propranolol. The areas under the plasma concentration--time curves (AUCs) of propranolol glucuronide (PG), 41 +/- 15 ng . hr/ml, and propranolol, 48 +/- 15 ng . hr/ml, were of the same order after the intravenous dose (0.05 mg/kg). After oral doses of 20 and 80 mg, the AUCs of PG were 302 +/- 105 and 1,398 +/- 409 ng . hr/ml; these were 7 times the AUCs of propranolol, 44 +/- 15 and 220 +/- 38 ng . hr/ml. The time lapse to peak concentration, 1.5 to 3.0 hr, and the plasma half-life, 3.2 to 3.7 hr, were the same for PG and propranolol. These results demonstrate glucuronidation as an important determinant of propranolol bioavailability.


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