Sultolin® HFA Inhaler Refill 100 mcg is a metered-dose inhaler (MDI) manufactured by Square Pharmaceuticals Ltd., containing Salbutamol (also known as albuterol), a selective β₂-adrenergic agonist. It is primarily used for the relief and prevention of bronchospasm in conditions such as asthma and chronic obstructive pulmonary disease (COPD).