Ashtangasamgraha 27.31

27.31

If it does not operate, however, one should make him drink hot water to stimulate the medicine,

and one should foment the abdomen with the heat of the hands.

And when it has operated, in one whose digestive fire is kindled, whose body is oleated, and who has abundant doṣas—or if it has operated only slightly or not at all—even in one with slight doṣas, once the medicine is digested, one may administer a further dose, considering the remainder of the day and [his] strength;

but not while the medicine is undigested, for fear of excess.

Associated with doṣa, it cooks the hair, whence graying arises.