Charak Samhita
पीते प्रस्रंसने दोषान्न निर्हत्य जरां गते। वमिते चौषधे धीरः पाययेदौषधं पुनः॥६३॥
If the purgative drugs get digested without expelling the dosha or vomited, then the physician can give the suitable purgative drugs once again confidently.
english translation
pIte prasraMsane doSAnna nirhatya jarAM gate। vamite cauSadhe dhIraH pAyayedauSadhaM punaH॥63॥
hk transliteration by Sanscript