Use an antidote to nullify poison.
Antidote may be bought for 50 Gil in all shops in the game after finishing the battle at the Magic City Gariland. It may also be won from the Red Panther and Black Goblin enemies and sometimes found with theTreasure Hunter ability on the battlefields. Chemists can use the Antidote after buying it as an ability for 70 JP. It may be one of the first abilities a Chemist can learn.