Antitoxin

Antitoxin (毒消し, Dokukeshi) is the standard Poison recovery item throughout the Suikoden series. It removes the Poison status effect and is usually bought in bundles of 4.

Information
This inexpensive item is used to heal people afflicted with forms of poison. It is wise to have this item readied in advance, especially if you expect to encounter any venomous monsters on your journey.

It was not universally effective against all forms of toxin. For example, it could do nothing against the poison pollen of the monstrous Antoinette during the Gate Rune War.