The short term effects of propranolol, atenolol and labetalol on antipyrine kinetics in normal subjects.

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Abstract
1 The effects of three day courses of propranolol 40 mg three times daily, atenolol 100 mg twice daily and labetalol 100 mg three times daily on antipyrine kinetics were examined in 13 normal subjects. 2 The mean antipyrine clearance initially was 41.3 +/‐ 12.4 ml/min (mean +/‐ s.d.) and fell to 35.0 +/‐ 12.1 ml/min following propranolol (P less than 0.025), 34.5 +/‐ 9.5 ml/min following atenolol (P less than 0.01), and 35.2 +/‐ 8.6 ml/min following labetalol (P less than 0.05). 3 The prolongation in antipyrine half‐life was significant only following atenolol. Propranolol only caused a significant reduction in the volume of distribution of antipyrine. 4 These adrenoceptor antagonists appear to decrease antipyrine clearance in normal subjects. The reduction in antipyrine clearance was similar with all three drugs and appeared to be independent of the differing lipid solubilities and pharmacological profiles of the adrenoceptor antagonists examined.