Authors: Faranak Ghaderi Mahboob Nemati Mohammad R SiahiShadbad Hadi Valizadeh Farnaz Monajjemzadeh
Publish Date: 2015/09/05
Volume: 123, Issue: 3, Pages: 2081-2090
Abstract
In the present paper the physicochemical incompatibility of doxepin with dextrose was evaluated in solidstate mixtures The compatibility was evaluated using different physicochemical methods such as differential scanning calorimetry DSC Fourier transform infrared spectroscopy and mass spectrometry Nonisothermally stressed physical mixtures were used to study the solidstate kinetic parameters Different thermal models such as Friedman Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose were used for the characterization of the drug–excipient mixtures Overall the incompatibility of doxepin as a tertiary amine with dextrose as a reducing carbohydrate was successfully assessed DSCbased kinetic analysis is a simple and fast method in evaluation of different drug–excipient mixtures incompatibility Finally it can be recommended to exclude dextrose from doxepin pharmaceutical formulations and also to apply the easy and versatile DSC method in kinetic study of drug–excipient incompatibility
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