Within 24 hours: While Prednisone and other oral steroids are rapidly absorbed from the GI tract and begin to kill eosinophils in the blood (common white blood cell in allergic asthma) within 4 hours, the lung effect is typically longer but within 24 hours. (that is why it is important to start Prednisone early in an asthma attack).
Answered 7/4/2018
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