Clenbuterol is a bronchodilator and decongestant asthma medication in the form of a tablet, available in 20 mg and 40 mg dosages. This medication is used to open airways in the lungs, making breathing easier and relieving chest congestion. Clenbuterol may be prescribed as a single daily dose of 20-40mg for the treatment of physician-diagnosed chronic asthma, or in larger doses for relief of acute asthma symptoms. This medication can also help to reduce symptoms of allergies, hay fever and chronic cough. 100 tablets may last for a few months depending on the dosage prescribed, and should be stored in a cool, dry place.