Do not use VENTOLIN HFA unless your healthcare provider has taught you how to use the inhaler and you understand how to use it correctly. Do not increase your dose or take extra doses of VENTOLIN HFA without first talking to your healthcare provider. Do not use VENTOLIN HFA unless your healthcare provider has taught you how to use the inhaler and you understand how to use it correctly. Do not increase your dose or take extra doses of VENTOLIN HFA without first talking to your healthcare provider. Use Ventolin HFA exactly as your healthcare provider tells you to use it. Do not use Ventolin HFA more often than prescribed. Do not increase your dose or take extra doses of Ventolin HFA without first talking to your healthcare provider. On demand use of Ventolin should not exceed four times daily. Reliance on such Reliance on such supplementary use or a sudden increase in dose indicates deteriorating asthma (see Only use Ventolin as prescribed by your physician. An overdose of albuterol can be fatal. Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose of albuterol can be fatal. If you are using other inhalers at the same time, use the salbutamol inhaler first and then wait for a few minutes before using the other inhalers. Salbutamol opens your air passages to allow the other inhalers to work more effectively. These highlights do not include all the information needed to use VENTOLIN HFA safely and effectively. See full prescribing information for VENTOLIN HFA. Ventolin: Salbutamol belongs to a class of medications called bronchodilators, and more specifically, ß2-adrenergic agonists. This medication is used to treat asthma, chronic bronchitis, and other breathing disorders. This eMedTV resource explains that the starting Ventolin dosage for preventing or treating an asthma attack is two sprays as needed every four to six hours. This page also lists some general tips on when and how to use your Ventolin inhaler. How to use Ventolin HFA Aerosol With Adapter. Read the Patient Information Leaflet provided by your pharmacist before you start using this medication and each time you get a refill.