An anti-asthmatic agent, also known as an anti-asthma drug, refers to a drug that can aid in airway smooth muscle dilation to allow normal breathing during an asthma attack or reduce inflammation on the airway to decrease airway resistance for asthmatic patients, or both. The goal of asthmatic agents is to reduce asthma exacerbation frequencies and related hospital visits. Anti-asthmatic agents as rescue medications for acute asthma attacks include short-acting β2-adrenergic receptor agonists (SABA), short-acting muscarinic antagonists (SAMA), systemic glucocorticoids, and magnesium sulfate...