Transdermal Irritation/Sensitization Assessment
FDA has published a draft guidance, Assessing the Irritation and Sensitization Potential of Generic Transdermal and Topical Delivery Systems for ANDAs, with recommendations for the design and conduct of studies to evaluate the in vivo skin irritation and sensitization (I/S) potential of a proposed drug transdermal or topical delivery system (TDS). The document says its recommendations relate to studies submitted in support of an ANDA. It revises a 10/2018 guidance with the same name to (1) clarify recommendations for the design and conduct of studies to evaluate the in vivo skin I/S potential of a proposed TDS; (2) clarify when an in vivo study to assess the sensitization potential of a TDS product may not be needed; and (3) provide guidance to applicants intending to use alternative scoring scales or alternative approaches to compare I/S between the test and reference TDS.
The agency also issued a draft guidance on assessing adhesion with TDS for ANDAs. It says the two drafts were published to provide clear, convenient information to current and potential ANDA applicants as outlined in the agency’s Drug Competition Action Plan.