Answer: Antihistamines
Step-by-step explanation:
Antihistamines are used to treat allergies. When an allergic reactions takes place then the immune system of the body starts its function by releasing chemicals.
The immune system of the body releases histamines which is known as a chemical that causes the symptoms of allergy.
It leads to inflammation, coughing, sneezing et cetera. In response to this antihistamines are used to treat allergies.