ERYTHROMYCIN
According to the official FDA enforcement report:
CGMP Deviations; presence of N-Nitroso-Desmethyl-Erythromycin above the recommended acceptable intake limit
Erythromycin Tablets, USP, 250 mg, 30 tablets per bottle, Rx only, Manufactured by: Zydus Lifesciences Ltd., Ahmedabad, India, Distributed by: Zydus Pharmaceuticals (USA) Inc., Pennington, NJ 08534; a) 30 count bottles (NDC 70710-1047-3); b) 100 count bottles (NDC 70710-1047-1).
Nationwide within the U.S
Official Source Provenance
Verified regulatory citation from U.S. FDA OpenFDA