API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Diphenhydramine Hydrochloride

EP Impurity D

 diphenylmethanol (benzhydrol) Diphenhydramine HydrochlorideEP Impurity D
Diphenhydramine Hydrochloride

EP Impurity E

 diphenylmethanone (benzophenone). Diphenhydramine HydrochlorideEP Impurity E
Diphenhydramine Hydrochloride

EP Impurity A

 2-(diphenylmethoxy)-N-methylethanamine Diphenhydramine HydrochlorideEP Impurity A