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Bioavailability of acetaminophen containing suppositories in rats
G Regdon1, M Szikszay, G Gebri
1Department of Pharmaceutical Technology, Albert Szent-Györgyi Medical University, Szeged, Hungary.
Die Pharmazie
|August 13, 1999
Summary
Optimizing acetaminophen (paracetamol) rectal delivery involved testing suppository bases. Witepsol H 15 and Macrogolum 1540 bases showed excellent in vitro drug release, correlating with in vivo antipyretic effects in rats.
Area of Science:
- Pharmaceutical Sciences
- Drug Delivery Systems
Background:
- Rectal administration offers an alternative route for drug delivery.
- Optimizing suppository bases is crucial for effective drug release and absorption.
Purpose of the Study:
- To optimize rectal delivery of acetaminophen (paracetamol).
- To evaluate various lipophilic and hydrophilic suppository bases for in vitro drug liberation.
- To assess the in vivo pharmacological effect (antipyretic response) of acetaminophen suppositories.
Main Methods:
- In vitro drug liberation studies were conducted using different suppository bases.
- Experimental vehicles included Witepsol H 15 with Miglyol 812 and Macrogolum 1540 with Span 20.
- In vivo antipyretic activity was evaluated in rats.
Main Results:
- Witepsol H 15 (with 10% Miglyol 812) and Macrogolum 1540 (with 5% Span 20) demonstrated excellent in vitro drug liberation.
- The antipyretic response in rats was dependent on the suppository vehicle used.
- A strong correlation was observed between in vitro drug liberation and in vivo pharmacological outcomes.
Conclusions:
- The choice of suppository base significantly impacts acetaminophen's rectal delivery and efficacy.
- Witepsol H 15 and Macrogolum 1540 are promising bases for acetaminophen suppositories.
- In vitro drug liberation studies effectively predict in vivo performance for rectal acetaminophen formulations.