Summary
The pharmacokinetics of the dipyrone metabolite, 4-metylaminoantipyrine (MAA) was evaluated, following the administration of a single oral dose of dipyrone 1.0 g to 12 young (21–30 years) and 9 elderly (73–90 years) healthy volunteers.
Maximal concentration, time to peak and absorption rate of MAA were similar for both groups. The elimination half-life was 2.6 (0.2) h for the young and 4.5 (0.5) h for the elderly subjects. Total clearance of MAA, corrected for lean body mass (LBM), was lower in the elderly than in the young 2.65 vs 3.97 ml·min−1·k−1 LBM. There was no differences between the groups in the apparent volume of distribution. A good correlation was found between the total body clearance of MAA and the creatinine clearance, which was also reduced in the elderly (r=0.61).
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Zylber-Katz, E., Granit, L., Stessman, J. et al. Effect of age on the pharmacokinetics of dipyrone. Eur J Clin Pharmacol 36, 513–516 (1989). https://doi.org/10.1007/BF00558078
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DOI: https://doi.org/10.1007/BF00558078