Bioavailability of indomethacin after intramuscular injection and rectal administration of solution and suppositories.

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Jensen KM, Grenabo L

Bioavailability of indomethacin after intramuscular injection and rectal administration of solution and suppositories.

Acta Pharmacol Toxicol (Copenh). 1985 Nov;57(5):322-7.

PubMed ID
4090993 [ View in PubMed
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Abstract

The pharmacokinetics of indomethacin was studied after intravenous and intramuscular injection of 50 mg and administration of rectal solution and suppositories of 100 mg to 8 volunteers. Peak plasma concentrations of indomethacin occurred 20 min. after administration of the rectal solution (3.7 micrograms X ml-1), 40 min. after intramuscular injection (2.7 micrograms X ml-1), and 60 min. after suppositories (3.7 micrograms X ml-1). The bioavailability after the two rectal forms was found to be almost the same, about 80%. After intramuscular injection the bioavailability was calculated to be complete. These results suggest that indomethacin administered as a rectal solution or as intramuscular injection may be an alternative to intravenous administration when an early plasma peak of the drug is required.

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