Treatment of Hypersensitivity Pneumonitis Corticosteroids Treatment of acute or subacute hypersensitivity pneumonitis is with corticosteroids, usually prednisone 60 mg orally once a day for 1 to 2 weeks, then tapered over the next 2 to 4 weeks to 20 mg once a day, followed by weekly decrements of 2.5 mg until the drug is stopped.