The Dagbani Dictionary lists several words spelled tim. The main one is the noun tim (plural tima): 'medicine; remedy, cure; a drug; a charm, magic; magic power; chemical(s), powder'. The verbs spelled tim mean 'to send a person', 'to dip; to be full to the brim; to take a short-cut', and 'to put in'.
She went to buy tim, medicine, for her fever.