The Compendium of Caraka 7.5.9

7.5.9

pibettadvamanaṃ śreṣṭhaṃ pittaśleṣmanibarhaṇam/
aṣṭāhaṃ payasā++ārkeṇa teṣāṃ cūrṇāni bhāvayet//

one should drink that: an excellent emetic destroying pitta and kapha.
For eight days one should steep their powders with milk of arka;