Ashtangasamgraha 17.30

17.30

tasmāt |

kiñcidrasena kurute karma pākena cāparam |

dravyaṃ guṇena vīryeṇa prabhāveṇaiva kiñcana ||

pānabhojaneṣu vā viṣaṃ nikṣipet |

ikṣugaṇḍikāṃ vā bhakṣayet kṛṣṇasarpeṇa daṃśayitvā vallīphalāni vā mūlakaṃ vā ||

rūpāṇi sūkṣmadīptāni sahasā nāvalokayet ||

Therefore:

A substance performs some action by virtue of its taste, another by its post-digestive effect,
something by its quality, by its potency, or indeed solely by its specific action.

Or one should cast poison into drinks and food;

or chew a section of sugarcane bitten by a black cobra, or fruits of climbers, or a radish;

one should not suddenly gaze upon subtle and radiant forms.