Ashtangasamgraha 41.74

41.74

raktāsyanayanā ye ca te syurāśīviṣopamāḥ |

na teṣāṃ kālaniyamo na ca vegeṣvanukramaḥ ||

and those with red mouth and eyes, are like virulent-venom serpents (āśīviṣa);
for them there is no limitation of time, nor orderly sequence in the venom impulses;