Acarids
Aeroallergen
Allergens
Allergic reactions
Anemophilous pollens
Anti-leukotriene
Antibodies
Antihistamine
Atopic
Bronchodilator
Congestion
Conjunctivitis
Corticosteroid
Dermatitis
Desensitisation
Dyspnoea
Eczema
Erythema
Graminaceae
Hayfever
Herbaceous
Histamine

Antihistamine

A substance which blocks the action of histamine, a chemical released in the body fluids during an allergic reaction.