The Compendium of Caraka 6.26.211

6.26.211

karpūrakuḍavaṃ cāpi kṣipecchīte 'avatārite/
tatastu guṭikāḥ kāryāḥ śuṣkāścāsyena dhārayet//

and when it has cooled and been taken off [the fire], one should add a kuḍava of camphor. / From that, pills should then be made; and dried, one should hold them in the mouth.