Ventolin Evohaler is a metered-dose inhaler containing salbutamol, a fast-acting bronchodilator medication used for the relief and prevention of asthma symptoms. Each inhaler delivers 200 doses, with each dose containing 100 micrograms of salbutamol sulfate. This is a prescription-only medication used to treat and prevent bronchospasm in patients with asthma, bronchitis, and other respiratory conditions. The inhaler contains a pressurized suspension that delivers precisely measured doses of medication directly to the airways when inhaled. The blue-colored inhaler comes with a dose counter to help track remaining medication. As with all prescription medications, this should only be used under medical supervision and according to prescribed instructions.