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

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)
CAS Number
67564-91-4
Alternate CAS Number
67306-03-0 (No stereochemistry)
CAS Number
26787-78-0
Alternate CAS Number
61336-70-7 (Amoxicillin Trihydrate - API (Trihydrate Salt)) , 34642-77-8 (Na salt)