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Diclofenac does not interact with codeine metabolism in vivo: a study in healthy volunteers.

Ammon S, Marx C, Behrens C, Hofmann U, Mürdter T, Griese EU, Mikus G - BMC Clin Pharmacol (2002)

Bottom Line: In terms of side effects, both treatments were well tolerated.Diclofenac did not significantly influence the analgesic effects of codeine in the cold pressor test.In contrast to recent in vitro data, a single oral dose of diclofenac did not alter the glucuronidation of codeine in healthy volunteers.

View Article: PubMed Central - HTML - PubMed

Affiliation: Internal Medicine VI - Clinical Pharmacology and Pharmacoepidemiology, University Hospital, Heidelberg, Germany. susanne.ammon@medizin.uni-magdeburg.de

ABSTRACT

Background: Previously, we have demonstrated a marked inhibition of codeine glucuronidation by diclofenac in human liver tissue homogenate. We therefore aimed to investigate whether diclofenac inhibits glucuronidation of codeine also in vivo in healthy volunteers.

Methods: In a randomised, placebo-controlled, double-blind, cross-over study, 12 healthy volunteers received a singe of 100 mg codeine phosphate plus 50 mg diclofenac sodium or codeine phosphate plus placebo. Over a 36 hour period serum concentrations of codeine and its metabolites as well as urinary excretion were analysed using LC-mass spectrometry. Side effects were recorded and analgesic efficacy was determined using the cold pressor test (0-6 h).

Results: A single dose of diclofenac did not alter the formation of codeine-6-glucuronide in healthy volunteers. Metabolic clearance of codeine to morphine was not affected by diclofenac. In terms of side effects, both treatments were well tolerated. Diclofenac did not significantly influence the analgesic effects of codeine in the cold pressor test.

Conclusions: In contrast to recent in vitro data, a single oral dose of diclofenac did not alter the glucuronidation of codeine in healthy volunteers.

Show MeSH
Pain threshold after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac. B Pain tolerance after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac
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Figure 4: Pain threshold after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac. B Pain tolerance after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac

Mentions: The area under the pain threshold-time as well as the area under the pain tolerance-time curves did not differ significantly after administration of codeine + placebo vs. codeine + diclofenac (8.68 ± 12.7 vs. 4.87 ± 9.82 s*h and 23.3 ± 57.5 vs. 13.9 ± 35.6 s*h, respectively). The time courses of pain threshold and pain tolerance are displayed in Figure 4.


Diclofenac does not interact with codeine metabolism in vivo: a study in healthy volunteers.

Ammon S, Marx C, Behrens C, Hofmann U, Mürdter T, Griese EU, Mikus G - BMC Clin Pharmacol (2002)

Pain threshold after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac. B Pain tolerance after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC101395&req=5

Figure 4: Pain threshold after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac. B Pain tolerance after administration of codeine + placebo vs. codeine + diclofenac, corrected to baseline at t = 0 (Mean, SD, n= 12) ▪ codeine + placebo • codeine + diclofenac
Mentions: The area under the pain threshold-time as well as the area under the pain tolerance-time curves did not differ significantly after administration of codeine + placebo vs. codeine + diclofenac (8.68 ± 12.7 vs. 4.87 ± 9.82 s*h and 23.3 ± 57.5 vs. 13.9 ± 35.6 s*h, respectively). The time courses of pain threshold and pain tolerance are displayed in Figure 4.

Bottom Line: In terms of side effects, both treatments were well tolerated.Diclofenac did not significantly influence the analgesic effects of codeine in the cold pressor test.In contrast to recent in vitro data, a single oral dose of diclofenac did not alter the glucuronidation of codeine in healthy volunteers.

View Article: PubMed Central - HTML - PubMed

Affiliation: Internal Medicine VI - Clinical Pharmacology and Pharmacoepidemiology, University Hospital, Heidelberg, Germany. susanne.ammon@medizin.uni-magdeburg.de

ABSTRACT

Background: Previously, we have demonstrated a marked inhibition of codeine glucuronidation by diclofenac in human liver tissue homogenate. We therefore aimed to investigate whether diclofenac inhibits glucuronidation of codeine also in vivo in healthy volunteers.

Methods: In a randomised, placebo-controlled, double-blind, cross-over study, 12 healthy volunteers received a singe of 100 mg codeine phosphate plus 50 mg diclofenac sodium or codeine phosphate plus placebo. Over a 36 hour period serum concentrations of codeine and its metabolites as well as urinary excretion were analysed using LC-mass spectrometry. Side effects were recorded and analgesic efficacy was determined using the cold pressor test (0-6 h).

Results: A single dose of diclofenac did not alter the formation of codeine-6-glucuronide in healthy volunteers. Metabolic clearance of codeine to morphine was not affected by diclofenac. In terms of side effects, both treatments were well tolerated. Diclofenac did not significantly influence the analgesic effects of codeine in the cold pressor test.

Conclusions: In contrast to recent in vitro data, a single oral dose of diclofenac did not alter the glucuronidation of codeine in healthy volunteers.

Show MeSH