When you have allergies, your immune system mistakes normally harmless substances for dangerous invaders and produces antibodies to fight them. These antibodies release chemicals, such as histamine, that cause allergy symptoms.
Drugs used for the prevention and treatment of allergic diseases are called as antiallergic agents. Antiallergic drugs include anti-histamine drug and Allergic reaction medium inhibitor-releasing agent...etc. We are always getting breakthrough development and accelerated technical innoviation so that we could develop more and more APIs that used for the medicine production.