 <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]  so that they open up and you can breathe more easily. Umeclidinium belongs to a class of drugs known as anticholinergics. Vilanterol belongs to the class of drugs known as long-acting beta agonists (LABAs). Both drugs are also known as bronchodilators.This medication must be used regularly to be effective. It does not work right away and should not be used to relieve sudden shortness of breath. If sudden breathing problems occur, use your quick-relief inhaler as prescribed.Umeclidinium/vilanterol is not approved to treat asthma. People with asthma using long-acting inhaled beta agonists (such as vilanterol) without also using an inhaled corticosteroid may have an increased risk of serious (sometimes fatal) breathing problems. How to use Umeclidinium-Vilanterol Blister, With Inhalation Device 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. If you have any questions, consult your doctor or pharmacist. Inhale this medication by mouth as directed by </s>