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The effect of non-ionic surfactants in a polyacrylic acid gel base on the rectal absorption of [Asu1,7]-eel calcitonin, a calcitonin analogue, was studied in rats. Absorption was enhanced by a microenema which used a polyacrylic acid gel base, but it was reduced by the incorporation of polysorbate 80 (0.1-5% v/v). The incorporation of polyoxyethylene 9 lauryl ether (0.1-5% v/v) in the polyacrylic acid gel base enhanced the absorption. Rectal administration in the base containing 0.5% v/v polyoxyethylene 9 lauryl ether required a dose of the calcitonin 2-3 times greater than an intramuscularly administered dose to achieve an equivalent hypocalcaemic effect.
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