Aminophylline Injection 25 mg/mL is a respiratory smooth muscle relaxant for acute bronchospasm and airway obstruction management. Each single-dose vial contains 20 mL for intravenous administration in emergency and critical care settings. This xanthine derivative rapidly dilates airways and improves respiratory function in asthma exacerbations and COPD crises. Popular with EMS and hospital protocols, it provides reliable symptom relief when rapid intervention is essential.