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British Journal of Clinical Pharmacology logoLink to British Journal of Clinical Pharmacology
. 1986 Aug;22(2):135–142. doi: 10.1111/j.1365-2125.1986.tb05240.x

Influence of gender and oral contraceptive steroids on the metabolism of salicylic acid and acetylsalicylic acid.

J O Miners, N Grgurinovich, A G Whitehead, R A Robson, D J Birkett
PMCID: PMC1401110  PMID: 3756063

Abstract

Salicylic acid and acetylsalicylic acid (aspirin) disposition after an oral dose of aspirin, 900 mg (equivalent to 689.7 mg of salicylic acid) was studied in eight males, eight females and eight females receiving oral contraceptive steroids (OCS). Salicylic acid clearance was 61% higher in males compared to the control female group, an effect due largely to enhanced activity of the glycine conjugation pathway (salicyluric acid formation) in males. Salicylic acid clearance was 41% higher in OCS-users compared to the control female group due to increases in both the glycine and glucuronic acid conjugation pathways in the pill users. There was no difference in any salicylic acid disposition parameter between males and OCS-users. Area under the plasma concentration-time curve (AUC) and elimination half-life of aspirin was significantly greater and aspirin plasma hydrolysis rate was significantly lower in both female groups compared to males. There was no difference between OCS-users and the control female group in any of these parameters. Aspirin AUC and elimination half-life were significantly correlated with aspirin plasma hydrolysis rate. These data confirm the importance of hormonal factors in the regulation of drug conjugation reactions in humans and suggest that sex-related differences in salicylic acid and aspirin disposition may be of clinical importance.

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Selected References

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