ketotifen and its Impurities
Ketotifen is used to treat allergic conjunctivitis. It is sold under the brand name Zaditor. It is most commonly sold as a salt with fumaric acid, ketotifen fumarate, and is available in two forms. Reference standards of Ketotifen API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

![2-(4-(10-oxo-9,10-Dihydro-4H-benzo[4,5]cyclohepta[ PA 11 0061001](https://www.pharmaffiliates.com/pimages/PA110061001.jpg)
2-(4-(10-oxo-9,10-Dihydro-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene)piperidin-1-yl)succinic Acid
2-(4-(10-oxo-9,10-Dihydro-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene)piperidin-1-yl)succinic Acid
Catalogue No.:PA 11 0061001
CAS :
NA
Molecular Formula : C22H21NO5S
Molecular Weight : 411.47