Tablet coating is a common pharmaceutical technique of applying a thin polymer layer which is prepared either into the aqueous solvent system or non-aqueous solvent system. Tablet coating is also carried out by preparing the drug coating solution. The main reason of coating the tablets are mainly taste masking, due to unpleasant odour, enhancement of the drug stability, appearance of the tablet and rough surface and so on. This problem can be overcome by using the aqueous solvent system rather than using the non-aqueous solvent system because this aqueous solvent system is not harmful to the human who are working in to the development area. Film coating technique is also consider for the controlled release tablet. Spray atomization technique is most useful for film coating of tablet.
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