GDUFA Research Outcomes
Complex Routes of Delivery
The Generic Drug User Fee Amendments (GDUFA) science and research program facilitates patient access to high-quality generic drugs by advancing research in areas where generic product development has been limited or prevented due to knowledge gaps about the kind of evidence needed to demonstrate that a generic product is the same as its brand name reference listed drug product. Leaders and experts across the generic industry collaborate to establish GDUFA research priorities for the most pressing scientific challenges they face with generic product development. Scientists and clinicians from industry, academia, and the U.S. Food and Drug Administration (FDA) strategically design research in these areas so that the outcomes help to build scientific bridges across the knowledge gaps, thereby facilitating pharmaceutical manufacturers to develop generic drugs that were previously challenging or unfeasible to develop.
A major GDUFA science and research priority is to enhance the efficiency of bioequivalence (BE) approaches for complex routes of delivery, such as locally-acting gastrointestinal (GI), buccal, sublingual, inhalation, nasal, ophthalmic, otic, and topical dermatological, vaginal and rectal products. The advancement of research in this area focuses on understanding of how ingredients and other aspects of a formulation influence drug absorption via complex routes of delivery, building in vivo predictive models and identifying corresponding failure modes for BE, to support the development of efficient BE approaches for these products.
Outcomes including scientific publications, presentations, and posters arising from GDUFA-funded research in this priority area are available in this section.
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Clinical Study to Assess the Cutaneous Bioequivalence of Topically Applied Lidocaine and Prilocaine Products Using Dermal Open Flow Microperfusion
Tiffner, Katrin; Ramezanli, Tannaz; Birngruber, Thomas; Bodenlenz, Manfred; Lackner, Bettina; Raml, Reingard; Raney, Sam G; Sinner, Frank
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Dermal Pharmacokinetic Endpoint Studies to Evaluate Bioequivalence of Topically Applied Lidocaine and Prilocaine Drug Products
Tiffner, Katrin; Birngruber, Thomas; Schwagerle, Gerd; Bodenlenz, Manfred; Augustin, Thomas; Raml, Reingard; Kanfer, Isadore; Sinner, Frank
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A Clinical Study Design to Evaluate Whether the Systemic Bioavailability of Topical Drugs May Influence the Assessment of Local Dermal Pharmacokinetics by Dermal Open Flow Microperfusion (dOFM)
Tiffner, Katrin; Birngruber, Thomas; Schwagerle, Gerd; Ramezanli, Tannaz; Bodenlenz, Manfred; Lackner, B; Augustin, Thomas; Raml, Reingard; Kanfer, Isadore; Raney, Sam; Sinner, Frank
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In Vitro Release Test (IVRT) Comparisons of Six Acyclovir Cream, 5% Products to Evaluate the Impact of Compositional Differences on Product Performance
Tiffner, Katrin; Kanfer, Isadore; Augustin, Thomas; Raml, Reingard; Raney, Sam; Sinner, Frank
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Reference-Scaled Average Bio-Equivalence (SABE): A Promising Statistical Approach to Analyze Cutaneous Pharmacokinetic Results for Topically Applied Drug Products
Tiffner, Katrin; Rantou, Elena; Bodenlenz, Manfred; Augustin, Thomas; Reisnegger, Peter; Raml, Reingard; Raney, Sam; Sinner, Frank
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Evaluation of Dermal Open Flow Microperfusion (dOFM) as a General Methodology to Assess the Bioequivalence of Hydrophobic, Protein-Bound Topical Drug Products
Tiffner, Katrin; Birngruber, Thomas; Schwagerle, Gerd; Bodenlenz, Manfred; Augustin, Thomas; Raml, Reingard; Kanfer, Isadore; Raney, Sam; Sinner, Frank
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Comparative In Vitro Release Tests (IVRT) of Seven Topical Acyclovir Products Using A Validated Ivrt Method With A Vertical Diffusion Cell (VDC) Apparatus
Tiffner, K; Kanfer, I; Schimek, D; Reisenegger, P; Raml, R; Augustin, T; Raney, S G; Sinner, F
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Comparative In Vitro Release Of Six Different Topical Acyclovir Products Using A Vertical Diffusion Cell (VDC) Apparatus
Tiffner, K; Kanfer, I; Schimek, D; Reisenegger, P; Raml, R; Raney, S; Sinner, F
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Characterization of TEWL and Skin Impedance in a Clinical Study Measuring Acyclovir Permeation by Dermal Open Flow Microperfusion
Tiffner, Katrin; Bodenlenz, Manfred; Schwingenschuh, Simon; Hajnsek, Martin; Reisenegger, Peter; Kainz, Sonja; Augustin, Thomas; Baumann, Petra; Tschapeller, Bernd; Schwagerle, Gerd; Raml, Reingard; Kanfer, Isadore; Sinner, Frank
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Comparative In Vitro Release Of Six Different Topical Acyclovir Products Using A Vertical Diffusion Cell (VDC) Apparatus
Tiffner, K; Kanfer, I; Schimek, D; Reisenegger, P; Raml, R; Raney, S G; Sinner, F