Astanga Hrudaya
यमदूतपिशाचाद्यैर्यत्परासुर् उपास्यते । घ्नद्भिरौषधवीर्याणि तस्मात्तं परिवर्जयेत् ॥ १३० ॥
Fatal signs based on sudden destruction of potency of the medicines: In a patient who is going to die soon, the attendants of Yama (lord of death), the pisacas (Goblins) etc. destroy the potency of the medicines consumed (by the patient); hence such a patient should be rejected.
english translation
yamadUtapizAcAdyairyatparAsur upAsyate । ghnadbhirauSadhavIryANi tasmAttaM parivarjayet ॥ 130 ॥
hk transliteration by Sanscript