Abstract: A method and apparatus for coating medical tablets and pellets, for example, which are to be coated with a protective film or wherein an ingredient is to be added or the appearance of the material is to be improved wherein the various parameters which control the production rate which are determined by such variables as the spray rate, the temperature, the coating pan speed, the air flow, dew point, and composition of the spray material are used to calculate the optimum conditions for producing the coated tablets or pellets. The sensed parameters are supplied to a computer which controls the spray rate, the drum speed, the amount of heat and other factors so as to optimize and automatically control the apparatus and method for coating pellets and tablets.