Used in HPLC or LCMS impurity profiling. Applied in method development and validation. Monitored in stability studies. Ensures quality control and regulatory compliance.

Its main purpose is to function as a reference standard in pharmaceutical analysis ensuring impurity levels in azithromycin formulations stay within acceptable regulatory limits.

Azithromycin EP Impurity B is a specified related substance listed in the European Pharmacopoeia for the antibiotic Azithromycin. It is usually a process-related impurity or a degradation product formed during manufacturing or storage structurally similar to azithromycin.