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. 1988;35(1):109-11.
doi: 10.1007/BF00555519.

Therapeutic doses of codeine have no effect on acetaminophen clearance or metabolism

J Sonne  1 , H E Poulsen, S Loft, M Døssing, A Vollmer-Larsen, K Simonsen, H Thyssen, K Lundstrøm
Affiliations

Therapeutic doses of codeine have no effect on acetaminophen clearance or metabolism

J Sonne et al. Eur J Clin Pharmacol. 1988.

Abstract

In nine healthy volunteers, the clearance and metabolism of acetaminophen 1000 mg i.v. was evaluated with and without two concomitant oral doses of codeine in order to investigate a possible interaction. Plasma acetaminophen was followed for 720 min and urine was collected for 24 h after each dose for determination of metabolites. When codeine was coadministered, the average total clearance of acetaminophen and its clearance by glucuronidation, sulphation and mercapturate formation were 0.58 to 1.12-times the control values. It is concluded that therapeutic doses of codeine do not influence the clearance or metabolism of acetaminophen.

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