Ashtangasamgraha 42.28

42.28

kṛṣṇasarpeṇa daṣṭasya limpeddaṃśaṃ hṛte 'sṛji |

cāraṭīnākulībhyāṃ vā tīkṣṇamūlaviṣeṇa vā ||

When blood has been removed from one bitten by a black cobra (kṛṣṇasarpa), one should plaster the bite
with cāraṭī and nākulī, or with a sharp root poison;