Physical testing refers to the monitoring of physical characteristics of a drug product, typically oral dosage forms such as tablets and capsules. Physical testing examines the physical attributes of the drug form, such as disintegration and powder flowability.
Dissolution testing determines the release rate of an active pharmaceutical ingredient in tablet or capsule form as it dissolves into solution.
Diffusion testing is a release rate test of an active pharmaceutical ingredient in semisolid form as it permeates through a skin-like membrane into solution.
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