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Absorption of indomethacin from nasal cavity in rats
Z L Huang1, M Kagoshima, E Kagawa
1Department of Clinical Pharmacology, School of Pharmaceutical Sciences, Kitasato University, Tokyo, Japan.
Aim:
To investigate if identical bioavailability, rapid Tmax, and Cmax of indometacin (Ind) could be achieved when Ind is administered in rats via intranasal (ina) route.
Methods:
The pharmacokinetics of Ind solution at a dosage of 3 mg.kg-1 was studied after i.v., ina, and po in rats using HPLC.
Results:
It showed that the time to peak (Tmax) of ina Ind 3 mg.kg-1 solution was 0.08 h, approached that after i.v. route the peak concentration (Cmax) following ina was 20.0 mg.L-1, 2.4 times higher than po dosing.
Conclusion:
It demonstrated that the ina administration of Ind was superior to po in rats, and that Ind absorption through nasal mucosa was a reasonable approach at lower doses.