The Compendium of Caraka 6.3.161

6.3.161

jvaritaṃ ṣaḍahe 'atīte laghvannapratibhojitam/
stabhyante &na vipacyante kurvanti viṣamajvaram//
&`na cyavante ca' iti pā-.
doṣā baddhāḥ kaṣāyeṇa stambhitvāttaruṇe jvare/
na tu kalpanamuddiśya kaṣāyaḥ pratiṣidhyate//

who is feverish when six days have passed, having been fed light food.
Bound by an astringent [taste], the humors are arrested, do not undergo digestion, and produce intermittent fever,
because of [its] astringency in acute fever.
Decoction is not prohibited with respect to the [pharmaceutical] form;