Difference in rectal absorption of morphine from hollow-type and conventional suppositories in rabbits.

Abstract:

:The bioavailability of morphine after rectal administration using three types of suppositories containing morphine hydrochloride (10 mg) in different added forms was evaluated in rabbits. Three types of suppositories were constructed with a base material (Witepsol H-15): a conventional suppository containing morphine hydrochloride mixed with a base material, a hollow-type suppository containing morphine in an aqueous solution in its cavity, and a hollow-type suppository containing morphine as a powder (hydrochloride salt) in its cavity. The plasma concentrations of morphine and its metabolites, morphine-3-glucuronide (M-3-G) and morphine-6-glucuronide (M-6-G), were determined. The mean AUC0-6 of morphine after rectal administration of the hollow-type suppository containing powdered morphine was significantly higher than that after the administration of a conventional suppository, whereas the mean AUC0-6 of M-3-G was lower than that after administration of a conventional suppository. The mean AUC0-6 of M-6-G by a hollow-type suppository containing powdered morphine was higher than that by a conventional suppository. Although the mean AUC0-6 ratio of M-3-G to morphine after administration of a conventional suppository was three times larger than that of a hollow-type suppository containing powdered morphine, the mean AUC0-6 ratios of M-6-G to morphine after use of the three types of suppositories were all approximately 1.0. This study demonstrates that the hollow-type suppository containing powdered morphine is a more effective rectal dosage vehicle than the conventional suppository.

journal_name

Biol Pharm Bull

authors

Matsumoto Y,Watanabe Y,Yamamoto I,Matsumoto M

doi

10.1248/bpb.16.150

subject

Has Abstract

pub_date

1993-02-01 00:00:00

pages

150-3

issue

2

eissn

0918-6158

issn

1347-5215

journal_volume

16

pub_type

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