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Effect of food on the bioavailability of oxybutynin from a controlled release tablet
E Lukkari1, P Castrèn-Kortekangas, A Juhakoski
1Leiras Oy, Helsinki, Finland.
Objective:
The effect of food on the bioavailability of oxybutynin was assessed in a randomised cross-over study in 23 healthy volunteers. A single oral 10 mg dose of a controlled release oxybutynin tablet was administered after a high fat breakfast and to fasting subjects. The AUC, Cmax, tmax, t1/2 and MRT of oxybutynin and its active metabolite N-desethyloxybutynin were determined.
Results:
Breakfast did not change the AUC of oxybutynin but increased the AUC of N-desethyloxybutynin by about 20%. The Cmax of oxybutynin and N-desethyloxybutynin were two-fold higher when the drug was administered after breakfast compared to the fasting state.
Conclusion:
Breakfast significantly reduced the MRT of oxybutynin and N-desethyloxybutynin.