The branch of knowledge that deals with the dravyas (drugs as well as diet) that help in the maintenance of health and alleviation of diseases in the purush (human body), which is a
concomitance of panchamahabhootas and atma (the soul or the consciousness). It also deals with the properties, actions, dose, time of administration and various preparations of these
dravyas. Food items, like drugs, are also considered in these dravyas