The effect of 5 days treatment with allopurinol (300 mg) on the pharmacokinetics of indomethacin at steady-state was investigated in eight patients. Allopurinol produced no significant effect on the indomethacin serum concentration-time curve. Allopurinol did not alter significantly the amounts of indomethacin excreted in the urine within 8 h. However, the urinary ratio of N-deschlorobenzoylindomethacin to indomethacin was reduced significantly by allopurinol administration (P less than 0.05).
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Pullar et al. (1988) studied this question.
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