In Vivo Performance of an Oral MR Matrix Tablet Formulation in the Beagle Dog in the Fed and Fasted State: Assessment of Mechanical Weakness
Purpose To evaluate the behaviour of an oral matrix modified release formulation in the canine gastrointestinal tract, and establish if a mechanical weakness previously observed in clinical studies would have been identified in the dog model. Materials and Methods In vitro release profiles were obta...
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Published in | Pharmaceutical research Vol. 25; no. 5; pp. 1075 - 1084 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Boston
Springer US
01.05.2008
Springer Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Purpose
To evaluate the behaviour of an oral matrix modified release formulation in the canine gastrointestinal tract, and establish if a mechanical weakness previously observed in clinical studies would have been identified in the dog model.
Materials and Methods
In vitro
release profiles were obtained for two modified release matrix tablets containing UK-294,315, designed to release over either 6 (formulation A) or 18 (formulation B) hours. Tablets were labelled with
153
samarium and
in vivo
pharmacoscintigraphy studies were performed in four beagle dogs in the fasted state for both formulations, and following ingestion of an FDA high fat meal for formulation B.
Results
The matrix tablet formulations displayed significantly different
in vitro
release profiles (
F
2
< 50), with time to 80% release for formulation A and B of 406 and 987 min respectively. Complete
in vivo
disintegration occurred at 339 ± 181 and 229 ± 171 for formulation A and B respectively in the fasted state, and at 207 ± 154 min for formulation B in the fed state, in disagreement with
in vitro
release.
Conclusion
The fed/fasted dog model would have predicted a lack of physical robustness in the matrix tablet formulation B, however it would not have predicted the clear fed/fasted effects on performance observed previously in man. |
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ISSN: | 0724-8741 1573-904X |
DOI: | 10.1007/s11095-007-9462-6 |