Isothipendyl and its Impurities
Isothipendyl is an antihistamine and anticholinergic used as an antipruritic. It is a 1st generation H1 antagonist and anticholinergic. Reference standards of Isothipendyl API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

![10-(2-(Dimethylammonio)propyl)-10H-benzo[b]pyrido[ PA 09 74520](https://www.pharmaffiliates.com/pimages/PA0974520.jpg)
10-(2-(Dimethylammonio)propyl)-10H-benzo[b]pyrido[2,3-e][1,4]thiazine 10-oxide 5-oxide Chloride
10-(2-(Dimethylammonio)propyl)-10H-benzo[b]pyrido[2,3-e][1,4]thiazine 10-oxide 5-oxide Chloride
Catalogue No.:PA 09 74520
CAS :
NA
Molecular Formula : C16H20ClN3O2S
Molecular Weight : 353.87