Within the Allergy Treatment Drugs market, segmentation by type distinguishes pharmacological classes that drive revenue streams. Antihistamines represent the largest share, accounting for roughly 40 % of sales, due to their broad indication across seasonal and perennial allergic rhinitis. Corticosteroids, delivered orally or intranasally, capture about 25 % of the market, reflecting their efficacy in moderate‑to‑severe inflammation. Leukotriene receptor antagonists contribute near 10 %, primarily in asthma‑related allergic pathways. Mast‑cell stabilizers hold a modest 5 % share, limited by niche usage in ocular and nasal formulations. Biologics, such as anti‑IgE monoclonal antibodies, are rapidly expanding, currently representing 12 % of the market and projected to outpace legacy classes as precision medicine adoption rises. Finally, Allergen immunotherapy (subcutaneous or sublingual) accounts for the remaining 8 %, driven by long‑term disease‑modifying potential. Collectively, these type subsegments define the overall market size and inform investment priorities in the Allergy Treatment Drugs segmentation landscape.