Suggest Remedy For Itching In Scalp

my mother aged 45 is having scalp problem since 1.5 years . There is severe hair fall and there are several patches without hair.There was scaling of scalp with hair fall and we consulted a skin specialist and he diagnoised it as scalp psoriasis and prescribed an ointment (propsycl.... NOw there is no scaling but the itching presists. Pls advice .