anaphylactic

As adjectives the difference between anaphylactic and prophylactic

is that anaphylactic is pertaining to anaphylaxis while prophylactic is serving to prevent or protect against an undesired effect, especially disease.

As a noun prophylactic is

a medicine which preserves or defends against disease; a preventive.

As an adjective anaphylactic

is pertaining to anaphylaxis.

As a noun 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.

As adjectives the difference between anaphylactic and allergic

is that anaphylactic is pertaining to anaphylaxis while allergic is of or pertaining to allergy.

As a noun allergic is

a person with a tendency to having allergies; a person with multiple or severe allergies.

As adjectives the difference between anaphylactoid and anaphylactic

is that anaphylactoid is of, pertaining to, or resembling anaphylaxis while anaphylactic is pertaining to anaphylaxis.