FESOTERODINE FUMARATE
According to the official FDA enforcement report:
Failed Impurities/Degradation Specifications: Due to levels of 'Diester Impurity' exceeding the specification limit.
Fesoterodine Fumarate, Extended-release Tablets, 8 mg, 30 Tablets, Rx only, Manufactured by: Alembic Pharmaceuticals Limited, Panelav 389350, Gujarat, India, Manufactured for: Alembic Pharmaceuticals, Inc., Bedminster, NJ 07921, USA, NDC 62332-176-30
US Nationwide and PR.
Official Source Provenance
Verified regulatory citation from U.S. FDA OpenFDA