Ashtangasamgraha 17.9

17.9

itthaṃ ca nānauṣadhabhūtaṃ jagati kiñcid dravyamasti vividhārthaprayogavaśāt ||

virecanadravyakaṣāyaṃ nāgaradevadārupragāḍham |

trilavaṇādicūrṇaṃ vā dvitriguṇānulomanadravyam ||

praviṣṭamātrāṃ ca śalākāṃ dhārayet |

rāgāśruvedanānutpādanārthaṃ ca stanyena secayet |

tataḥ punarāturamāśvāsya bhramayan śalākāmā dṛṣṭimadhyāt praveśayet ||

And thus there is no substance in the universe that is not a medicine, by virtue of its employment for diverse purposes.
A decoction of purgative drugs heavily concentrated with ginger and devadāru;
or powder of the three salts and others, or an aperient substance in two or three times [the amount].
And one should hold the probe the moment it has entered;
and one should sprinkle with breast milk to prevent redness, tears, and pain;
then, having reassured the patient again, rotating the probe, one should insert it up to the center of the pupil.