Ashtangasamgraha 23.8

23.8

kālaśca bheṣajasya yogyatāmādadhāti |

sa kṣaṇalavamuhūrtādibhedenāturāvasthayā ca dvidhoktaḥ prāgapi ca |

śītoṣṇavarṣalakṣaṇastrividhaḥ kālaḥ |

tatra śītoṣṇayorvṛṣṭiśītayoścāntare sādhāraṇau vasantajaladātyāyu |

grīṣmavarṣakālayostu prārambho vṛṣṭeḥ prāvṛḍiti vikalpyate |

teṣu sādhāraṇeṣvahassu vamanādīnāṃ pravṛttirnnivṛttiritareṣvayogātiyogabhayāt |

sādhāraṇā hi mandaśītoṣṇavarṣatayā sukhatvāt bhavantyavikalpakāḥ śarīrauṣadhānām |

viparītāstvitare ||

bhojyayuktaṃ vā sraṃsanamavacārayet |

viśuddhasya ca samiddhe 'grāvasakṛt snehasvedau svādvamlalavaṇaṃ cānnapānam |

evamapyanivṛttāvavapīḍakasnehān bastikarma ca prayojayet ||

Time also confers fitness upon a medicament.

It has been stated previously to be twofold, distinguished by divisions such as moments, instants, and hours, and by the stage of the patient; and also:

time is threefold, characterized by cold, heat, and rain.

Among them, between cold and heat, and between rain and cold, are the two intermediate seasons, spring and autumn;

and between summer and the rainy season, the beginning of the rains is differentiated as the early rainy season.

During those intermediate days occurs the administration of emesis and other procedures, while during the others there is cessation due to fear of deficient or excessive application.

For the intermediate [times], being mild in cold, heat, and rain, are pleasant and do not perturb bodies or medicines;

the others are contrary.

Or one should administer a mild laxative mixed with food;

and for one who is cleansed, when the digestive fire is ignited, oleation and sudation repeatedly, and food and drink that are sweet, sour, and salty [are indicated].

Even so, if it does not subside, one should apply nasal press-juices, unctuous substances, and enema therapy.