 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  is a quick-relief drug. Levalbuterol belongs to a class of drugs known as bronchodilators. It works by relaxing the muscles around the airways so that they open up and you can breathe more easily. Controlling symptoms of breathing problems can decrease time lost from work or school.This drug is not approved for use in children younger than 4 years due to increased risk of side effects (such as unusual fast breathing, worsening asthma). Ask your doctor or pharmacist for details. How to use Xopenex 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. Follow the illustrated directions for the proper use of this medication and proper cleaning of the mouthpiece. If you have any questions, ask your doctor or pharmacist. Shake the canister well before using. Follow the instructions for test sprays in the air if you are using a canister for the first time or if you have not used it for 3 days or more. A fine mist is a sign that the inhaler is working properly. Avoid spraying the medication in your eyes. Inhale this medication by mouth as directed by your doctor, usually every 4 to 6 hours </s>