Generally in film coated tablet formulations the weight gain is very very less which can not be calculated as percentage, it is just few mg per tablet (say 5 to 10 mg).
In case of sugar coated tablets the weight gain of tablet after coating is significane in the range of 70% to 100% depending upon size and shape of tablets.
In case of enteric coated tablets the weight gain is in the range of 20% to 30% depending upon the tablet size and shape and more importanantly , the tablets must comply DT’ requirements (in both Acid medium & Alakaline medium).
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