Vamanasutta
“Tikicchakā, bhikkhave, vamanaṁ denti pittasamuṭṭhānānampi ābādhānaṁ paṭighātāya, semhasamuṭṭhānānampi ābādhānaṁ paṭighātāya, vātasamuṭṭhānānampi ābādhānaṁ paṭighātāya. Atthetaṁ, bhikkhave, vamanaṁ; ‘netaṁ natthī’ti vadāmi. Tañca kho etaṁ, bhikkhave, vamanaṁ sampajjatipi vipajjatipi.
Emetic
“Mendicants, doctors prescribe an emetic for eliminating illnesses stemming from disorders of bile, phlegm, and wind. There is such an emetic, I don’t deny it. But this kind of emetic sometimes works and sometimes fails.