Usage Note
allergique is invariable for gender (same form masculine and feminine). It is followed by à to name the allergen: être allergique au pollen. Figuratively, je suis allergique à can mean 'I can't stand' something, as in je suis allergique aux réunions ('I can't stand meetings'). The noun is l'allergie.
Examples
"Il est allergique aux arachides."
Natural Translation
He is allergic to peanuts.

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