Can cromolyn sodium be substituted for prednisolone during asthmatic attack?

Cromolyn sodium cannot be substituted for prednisolone during an asthmatic attack. Cromolyn sodium is a preventive medication that helps to reduce inflammation and prevent Asthma symptoms, while prednisolone is a corticosteroid used for its anti-inflammatory properties to treat acute exacerbations. During an asthma attack, immediate relief is often needed, which is typically provided by bronchodilators rather than preventive medications.