Abstract
The purpose of this study was to evaluate the potential of a pectin formulation with in situ gelling properties for the oral sustained delivery of paracetamol (acetaminophen). The formulations consisted of dilute aqueous solutions (1% to 2% w/v) of low methoxy pectin containing calcium ions in complexed form, which on release in the acidic environment of the stomach caused gelation of the pectin. In vitro studies demonstrated diffusion‐controlled release of paracetamol from the gels over a period of 6 h. A bioavailability of approximately 96% of that of a paracetamol solution could be achieved from gels containing an identical dose of drug formed in situ in the stomachs of rats, with appreciably lower peak plasma levels and a sustained release of drug over a period of at least 6 h.
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