Abstract
Bioequivalence determinations for locally acting dermatology drug products rely on assessing product sameness thru physicochemical composition and structure comparison, comparing the concentration of the active ingredient at the putative site of action, or comparing the clinical performance of the test (would-be generic) and reference products. Topical product action on cutaneous disease may be confounded by the action of excipients and are also subject to the inherent variability of how product may interact with the skin, including thermodynamic factors such as evaporation, spreadability, and interaction with the local environment such as heat and light and skin moisture.
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