Complex Generics: US FDA Heeds Some, But Not All, Of Industry’s Calls For Flexibility On Transdermal Products

Revised draft guidance suggests greater openness to alternative methods and scales for measuring adhesion, but agency sticks with 15% non-inferiority margin despite manufacturer objections; FDA also releases new guidance on assessing irritation and sensitization potential with topical delivery system products.

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The US FDA’s revised guidance on assessing adhesion with transdermal and topical delivery system (TDS) generic drugs reflects the agency’s receptivity to some, but not, all of industry’s criticisms that a June 2016 draft document would be too burdensome for manufacturers.

A revised draft guidance released Oct. 9 suggests a greater openness to the use of alternative methods and scales...

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