Highly Sensitive LC–QTOF‐MS Method Development and Validation for Trace Level Determination of N ‐Nitroso Tizanidine in Tizanidine Drug Substance and Formulations
Nitrosamine drug substance–related impurities have been a central focus of regulatory scrutiny due to their potential mutagenic and carcinogenic effects. Among these, N ‐nitroso tizanidine ( N ‐NTZD) is a possible impurity that may form during the manufacturing, processing, or storage of tizanidine (TZD) drug s...