The Compendium of Caraka 1.15.3

1.15.3

iha khalu rājānāṃ ājamātramanyaṃ vā vipuladravyaṃ vamanaṃ virecanaṃ vā pāyayitukāmena bhiṣajā prāgevaiṣadhapānāt saṃbhārā upakalpanīyā bhavanti samyakcaiva hi gacchatyauṣadhe pratibhogārthāḥ, na hi sannikṛṣṭe kāle prādurbhūtāyāmāpadi sataypi krayākraye sukaramāṃśu saṃbharaṇamauṣadhānāṃ yathāvaditi //

Here indeed, by a physician who wishes to administer emesis or purgation to a king, a king's equal, or another person of ample wealth, the provisions must be arranged well before the drinking of the medicine, so that they may be used when the medicine operates properly; for when an emergency has arisen at the immediate moment, even though money is available for purchase, it is not easy to quickly collect medicines properly.