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Abstract
The storage conditions as well as the compressional conditions of the aged tablets were found to have significant effect on their physico-chemical properties. In this study the changes in tablet weight, thickness, hardness, disintegration, drug release and drug content were evaluated for aspirin and phenylbutazone (pbz) tablets made with microcrystalline cellulose (MCC) and lactose bases. Tablets were made with different initial moisture content and stored at 40°C/90% relative humidity (R.H.). Tablet thickness was found, in general, to increase with storage, this increase was more prominent with aspirin. The increase in thickness was always accompanied with a decrease in hardness. There was a marked increase in disintegration time and decrease in dissolution rate of phenylbutazone tablets. This was more significant for the lactose based tablets, while, for aspirin tablets there was a negligible increase in both dissolution rate and the disintegration time. The present study indicated that incorporation of drugs in tablet bases has resulted in a different response towards storage