Diphenhydramine N-oxide with CAS No: 3922-74-5 is an impurity standard of Diphenhydramine. Diphenhydramine is an antihistamine used for allergy relief, itching, and cold symptoms. Diphenhydramine is also acts as a sedative and sleep aid. Diphenhydramine is important to be cautious of interactions and avoid overdose. Buy high quality Diphenhydramine N-oxide from Molsyns Research. Molsyns Research is one of the leading manufacturer and exporter of Diphenhydramine N-oxide