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

CAS Number
148-24-3(free base)
Alternate CAS Number
134-31-6(sulfate salt);207386-91-2(hemisulfate hemihydrate salt)
CAS Number
259793-96-9
CAS Number
42017-89-0
CAS Number
103-29-7
CAS Number
822-55-9(base)
Alternate CAS Number
32673-41-9 (HCl salt) ; 2702474-37-9 (2HCl salt)
CAS Number
22071-15-4
CAS Number
910297-52-8