Biothional is not a recognized term in the scientific or medical community. It is possible you meant to ask about one of the following:

* Bithionol: This is a topical anti-infective agent used to treat skin infections caused by parasites, bacteria, and fungi. It is also used as a veterinary medicine.

* Biotin: This is a B vitamin essential for healthy hair, skin, and nails.

Please clarify your query, and I will be happy to provide more information.