Charak Samhita
भेषजं दोषरुद्धं चेन्नोर्ध्वं नाधः प्रवर्तते। सोद्गारं साङ्गशूलं च स्वेदं तत्रावचारयेत्॥७२॥
If the administered drug is obstructed by the morbid dosha, unable to expel by upward & downward direction, associated with belching & bodyache, then appropriate swedana (fomentation) is given.
english translation
bheSajaM doSaruddhaM cennordhvaM nAdhaH pravartate। sodgAraM sAGgazUlaM ca svedaM tatrAvacArayet॥72॥
hk transliteration by Sanscript