Radiation Pneumonitis Treatment segmentation by type clusters interventions into corticosteroids, immunosuppressants, antifibrotics, supportive pharmaceuticals, and emerging biologics. Corticosteroids—primarily prednisone-methylprednisolone—still command the largest revenue share (>45 %) because they remain the first-line, cost-effective option for acute pneumonitis. Immunosuppressants (e.g., mycophenolate, azathioprine) form the second revenue block, prescribed when steroid tapering fails or autoimmune features emerge, contributing ~22 % of 2023 global sales. Antifibrotics—nintedanib and pirfenidone—are gaining share (~17 %) as clinicians extrapolate their idiopathic pulmonary fibrosis efficacy to prevent late radiation fibrosis. Supportive agents (antitussives, bronchodilators, PDE-4 inhibitors) add symptomatic value but collectively yield only ~11 % because of low per-patient cost. Finally, early-stage biologics targeting IL-6 and TGF-β represent <5 % today yet anchor the pipeline's valuation premium.