Oral ingestion has long been the most convenient and commonly employed route of drug delivery due to its ease of administration, least aseptic constraints and flexibility in the design of the dosage form. Tablet coating is one of the oldest pharmaceutical processes; perhaps, in early times the basic purpose of coating had been elegance or organoleptic enhancement, now there are many more reasons to it like environmental protection, taste and odor masking and for better ingestion, product identity and elegance, for putting incompatible components together, gastric protection etc. As this process maintained its status more of an art than a science, it consistently kept offering enough avenues for the pharmaceutical researcher to work on this.
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