Polymorphs of donepezil hydrochloride

摘要

Donepezil hydrochloride, 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-yl]methlypiperidine hydrochloride, is provided in the form of four polymorphs which are stable against heat and humidity. They are specified by peaks in X-ray powder diffraction pattern and absorption peaks in infrared absorption spectra in potassium bromide.