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Remove the poison status effect.
Description
Poisona is a magic spell in Final Fantasy VII Remake. It is the first spell granted by 
Cleansing Materia, and removes the 
Poison debuff from a target for a very low MP cost.
Use
Poisona costs only 3 MP to cast, and can be used with the cleansing materia. Removing poison is important, as the debuff can deal significant damage over time if not dealt with early. Its low MP cost means it is a viable alternative to Antidote. Although cleansing materia also provides 
Esuna, if the only debuff one wants to remove is Poison, using Poisona saves MP.
Aside from Antidote, a few alternatives exist to Poisona. Star Pendant grants immunity to the debuff. Similarly, the Resist spell also granted by the cleansing materia can grant immunity. As another alternative, one can also cast Regen to both provide a 10% HP heal, as well as remove the debuff. Casting Regen costs much more MP, and does not replace Poison with the 
Regen buff on the first cast, but this can be more useful as characters are more likely to have Healing Materia equipped than they are to have cleansing materia. Poison can also be removed with Chakra.
Cleansing materia can be paired with 
Magnify Materia to cure Poison on all characters at once. However, as only one magnify materia exists, this is an inefficient use of it. If one wants to cure all characters of Poison at once, they are better off pairing magnify with healing materia and using Regen, although it is normally better to simply grant immunity to Poison rather than rely on this.
Etymology
The suffix -na is derived from Japanese Naoshi (