How harmful is Neosporin if ingested?

My question is more in regards to animal ingestion...reptiles specifically. We use Neosporin pretty extenively on minor scratches, scrapes and cuts for the rescues we take into the organization. Sometimes the injuries are on the nose where the animal, such as an iguana, will lick. A more general answer regarding people will be better than no answer at all.

Thank you,

Veronica