Abstract
Pindolol, a pH dependent soluble beta adrenoceptor blocker has been formulated into a controlled drug delivery system. Drug pellets were prepared by extrusion spheronization technique. These were coated with different retardant polymers, namely ethylcellulose and Eudragit RS 100. The effect of different variables such as coating level and pH of dissolution medium have been studied. Drug release from pellets were found to be influenced by the pH of the dissolution medium. A flux release of the drug in the acidic buffer was observed from pellets coated with these polymers. To avoid this flux, a top coat using different pH sensitive polymers, namely Hydroxypropylmethyl cellulose phthalate (HPMCP 55) and Eudragit S 100 was successfully attempted and the drug release from the pellets was modified.
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