Salburen Refill Inhaler is a metered-dose inhaler (MDI) containing Salbutamol at a concentration of 100 micrograms per puff. Each refill unit delivers 200 metered doses and is designed for use with a compatible inhaler device. Salbutamol is a short-acting β2-adrenergic receptor agonist that works by relaxing the muscles in the airways, leading to bronchodilation and making breathing easier.