The Compendium of Bheḷa 6.19.17

6.19.17

ghṛtaprasthaṃ pacedebhiḥ tulyāṃśairmāhiṣaṃ bhiṣak | caturguṇena payasā pātavyaṃ yuktitaś ca tat ||

with equal parts of these, the physician should cook a prastha of buffalo ghee / with four times as much milk; and it should be drunk according to proper method.