Astanga Hrudaya
प्रवर्तयन् प्रवृत्तांश्च जानुतुल्यासने स्थितः। उभे पार्श्वे ललाटं च वमतश्चास्य धारयेत्॥२०॥
Sitting on a seat of the height of one knee, the bouts of vomiting should be held supported by another person.
english translation
pravartayan pravRttAMzca jAnutulyAsane sthitaH। ubhe pArzve lalATaM ca vamatazcAsya dhArayet॥20॥
hk transliteration by Sanscript