I am a brain tumor patient and before 2 month in cmc vellore my operation was held and I came here after 2 month and this time my redation is started and I already had take two raditon.my doctor give me some medicine and I can not understand when I take this medicine.the medicines are ondansetron periset-8mg, dexamethasone phosphate auradex-4 mg.,rajniti dine hydrochloride ranitin-150mg.m y doctor is also told me that one medicine is taken to 3,8 pm .please suggest me for this problem