Ashtangasamgraha 27.14

27.14

Then, having drunk [the medicine], resting his arms on his thighs, with his mind attentive to the emesis, being warmed by hands heated over a fire, he should wait for a muhūrta.

When he knows that, through the emergence of sweat, the doṣa is undergoing liquefaction;
and, through horripilation, it is displaced from its locations;
and, through distension of the belly, it has entered the belly; and gradually, through pressure on the heart, nausea, and salivation from the mouth, it has turned upward;

then, with several spittoons placed near at hand, with uninhibited attendants engaged in supporting his flanks and forehead, pressing his navel, and massaging his back in an upward direction, with lips, palate, and throat opened, not straining excessively to urge the urges, neither inducing urges that have not arisen nor failing to follow those that have arisen, touching the throat with two fingers whose nails have been closely clipped, or with stalks of blue lotus, white lotus, or castor, he should vomit.

He should be neither excessively erect, nor excessively bent forward, nor turned to one side.

In that regard, for one who is excessively erect, pain in the back and heart occurs;
for one who is excessively bent forward, pain in the head and abdomen occurs;
for one who is turned to one side, pain in the flanks, abdomen, heart, and supra-clavicular region occurs.

In that caused by parasites, there is itching, swelling, and bleary vision in the temples, palate, and head,
coppery and clear nasal discharge, and ringing in the ears.