Doxylamine EP Impurity D is used as a pharmaceutical reference standard for analytical method development method validation quality control testing and impurity profiling of doxylamine drug substances and formulations.

Its purpose is to identify quantify and control impurity levels during the manufacture and quality assessment of doxylamine ensuring compliance with pharmacopoeial and regulatory requirements.

Doxylamine EP Impurity D is a specified pharmacopoeial impurity associated with the manufacture and quality control of the antihistamine drug doxylamine. It is chemically known as 2-benzoylpyridine (phenyl(pyridin-2-yl)methanone) and is used as a reference standard in analytical testing.