Ashtangasamgraha 27.28

27.28

During the time of śleṣman, however, having caused the faults mentioned for one who has not undergone emesis, or colic, distension, and heaviness, one should purge in the afternoon or at night when śleṣman has diminished through emesis.
It is similar also when it is obstructed by food;
and that produces vomiting again.
For one who has not been purged, however, emesis is to be employed during the time of śleṣman on an empty stomach,
for in that way it is eliminated upward with ease.