Source: FDA, published letter. FDA published this warning letter; View Letter opens FDA's copy. To check it, open FDA's record for this establishment, listed under FEI 3002812722.
Violations3
Issue DateSep 17, 2025
Product TypeDrugs
StatusOpen
Letter Details
Firm
Ralph A. DeFronzo, M.D./University of Texas Health Science Center at San Antonio
Location
United States
FEI Number
3002812722
Country
United States
Issue Date
September 17, 2025
Issuing Office
Center for Drug Evaluation and Research (CDER)
Product Type
Drugs
Status
Open
Summary
Dr. Ralph A. DeFronzo at the University of Texas Health Science Center at San Antonio failed to conduct investigational drug studies in accordance with FDA regulations during inspections of two clinical protocols conducted between December 3-6, 2024. The primary violation cited was failure to ensure clinical investigations were conducted according to the investigational plan, specifically regarding subject eligibility criteria requirements under 21 CFR 312.60. The inspection was part of the FDA's Bioresearch Monitoring Program, which focuses on protecting human subjects' rights, safety, and welfare in clinical research.
Ralph A. DeFronzo, M.D./University of Texas Health Science Center at San Antonio FDA Warning Letter, September 17, 2025