Impurities are undesirable chemical components that remain in the active pharmaceutical ingredient during formulation. Impurities may reduce a product's efficacy.

CAS Number
52022-31-8
Alternate CAS Number
7648-98-8(Free base);115-79-7(Chloride salt)
CAS Number
2088879-81-4
Alternate CAS Number
2356152-56-0(HCl Salt)
CAS Number
107814-37-9
Alternate CAS Number
1384955-66-1(HCl Salt)
CAS Number
23828-92-4
Alternate CAS Number
18683-91-5(Freebase)
CAS Number
101900-43-0
Alternate CAS Number
101900-44-1(HCl salt)
CAS Number
117-96-4
Alternate CAS Number
737-31-5(sodium salt);131-49-7(meglumine salt);50978-11-5(Dihydrate)
CAS Number
76599-74-1
Alternate CAS Number
1207-29-0(HCl Salt)
CAS Number
2609-46-3
Alternate CAS Number
17440-83-4(Dihydrate HCl - Salt);2016-88-8(HCl salt)
CAS Number
72-69-5
Alternate CAS Number
894-71-3 (Nortriptyline Hydrochloride)
CAS Number
26360-49-6
Alternate CAS Number
27867-02-3(HCl salt)
CAS Number
1159-03-1
Alternate CAS Number
2754-55-4 (HCl salt)
CAS Number
50-48-6
Alternate CAS Number
549-18-8(HCl Salt)
CAS Number
1216406-90-4
Alternate CAS Number
2414962-06-2(HCl Salt);113994-41-5(Freebase);2138811-33-1(Fumarate Salt);NA(Mesilate Salt);2733700-89-3(besylate salt)