ISSN:
1432-1041
Keywords:
Key words Cyclosporin
;
Dipyrone
;
Pharmacokinetics
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract Background: A large number of drugs have been shown to affect the metabolism of cyclosporin A (CSA) and, since cyclosporin is characterized by a narrow therapeutic range, the consequences of such drug interactions may often be of clinical importance. Objective: To evaluate the effect of short-term administration of dipyrone on steady state CSA pharmacokinetics. Methods: Six kidney- and two heart-transplanted patients on chronic CSA therapy participated in this study, which consisted of two 4-day study periods separated by 3-week washout periods. The patients received, in addition to their usual drugs, dipyrone 500 mg or placebo t.i.d., as identical-looking tablets, and the order of administration was randomized. CSA concentrations were measured in whole blood by means of radio-immunoassay (CYCLO-Trac SP) daily during the study periods and periodically over 24 h on the fourth study day. Results: CSA concentrations over time were reduced after dipyrone (ANOVA, P 〈 0.01), but statistical significance was noted only at 2, 4, 5 and 10 h after drug intake (P 〈 0.05). Peak CSA concentration was not altered by dipyrone, but the time required to reach maximal concentration was longer with dipyrone treatment than with the placebo (3.8 ± 2.6 h vs 2.1 ± 0.6 h, P 〈 0.05). No consistent changes were noted for CSA trough level, elimination half-life and area under the concentration–time curve from 0 h to 12 h. Separate analysis of the kidney transplanted patients yielded similar results. Conclusions: Short-term administration of dipyrone is associated with a mild decrease in CSA blood concentration, which is most prominent in the first few hours after drug intake. In practice, no dose adjustment of CSA seems to be indicated during a short course of dipyrone treatment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002280050659
