Coating composition.

Tablet coating is perhaps one of the oldest pharmaceutical processes still in existence. The sugar-coating process was a skilled manipulative operation and could last for even five days. The operator must be highly skilled for such coating. In the last 25 years tablet coating has undergone several fundamental changes. Many modifications were advocated to improve the basic process and film coating chosen in place of sugar coating. Coating solution composition may affect the quality of final coated tablets. Some coating process parameters are affect the final quality of coated tablets so it is necessary to optimize the coating process parameters for particular equipment and particular film former. Optimization of composition of film coating solution is also required.