Coating refers to the unit operation of applying a layer of outer coating material to the dry surface of the formulation. This coating material not only makes the product easier to identify, but even improves the pharmacokinetic properties of the drug by altering its release: ensuring that the drug reaches its target and provides sufficient concentrations in the body to be maintained for an extended period of time. Coatings are widely used in oral solid dosage forms, including tablets, capsules, multi-particulates and drug crystals. However, the most common coated dosage form is the tablet, followed by the coated multi-particulate dosage form. Reasons for using coating drug dosage forms vary, but…