Abstract:
PURPOSE:Reverse micellar solutions of diclofenac sodium were encapsulated in soft gelatine capsules. On contact with aqueous media they exhibited an application induced transformation (AIT) into a semisolid system of liquid crystals (SSLC) which slows down drug release. The aim of the present paper was to study in vitro and in vivo drug release from these systems after rectal application. METHODS:In vitro drug release was determined in a self-constructed dissolution apparatus to simulate rectal application. For in vivo bioavailability studies rabbits were used as animal models. In vitro release and in vivo bioavailability of the capsules was compared to Voltaren suppositories. RESULTS:The release profiles of the in vitro experiments show zero-order kinetics. The in vivo bioavailability studies show bioequivalence in terms of AUC for both formulations (capsules and Voltaren suppositories). The mean residence time (parameter of sustained release) of the capsules is three time longer in comparison to Voltaren suppositories. CONCLUSIONS:Rectal administration of capsules provides an appropriate route for controlled release via AIT-SSLC which could be clearly verified in rabbits.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Schneeweis A,Müller-Goymann CCdoi
10.1023/a:1012127829032subject
Has Abstractpub_date
1997-12-01 00:00:00pages
1726-9issue
12eissn
0724-8741issn
1573-904Xjournal_volume
14pub_type
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