Ashtangasamgraha 2.73

2.73

doṣo jvarayati kruddhaścirācciratareṇa ca ||

naśyanti gaṇḍāḥ piṭakāḥ pralāpaśca jvarārtijaḥ ||

uṣṇāmbho 'nupiban khādettān sarvān vidhināmunā ||

śaśottamāṅganiryūhe śuṣyataḥ puṣṭikṛt param ||

the aggravated doṣa causes fever after a long time and after an even longer time.
Boils, eruptions, and delirium arising from the affliction of fever perish.
Drinking warm water afterward, one should consume them all according to this method.
A decoction of a hare's head is supremely nourishing for one who is emaciated.