antiallergic

As adjectives the difference between antiallergic and antiallergenic

is that antiallergic is that prevents, or relieves an allergy while antiallergenic is countering allergic reactions.

As nouns the difference between antiallergic and antiallergenic

is that antiallergic is any drug of this kind while antiallergenic is a substance that counters allergic reactions.

As nouns the difference between allergy and antiallergic

is that allergy is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma while antiallergic is any drug of this kind.

As an adjective antiallergic is

that prevents, or relieves an allergy.