Health Library Short-Acting Beta2-Agonists for Quick Relief of Asthma SymptomsFrom Healthwise

Prescription short-acting beta2-agonists for asthma include:

Short-acting beta2-agonists are available in inhaled, pill, liquid, and injectable forms. The inhaled form is available in metered-dose inhalers (MDIs) and as a liquid for compressor-driven nebulizers. Inhalers may be used differently, depending on the medication used. Always consult the directions to be sure you are using the inhaler correctly. Short-acting beta2-agonists are also available without a prescription (such as Primatene).

Short-acting beta2-agonists are bronchodilators. They relax the muscles lining the airways that carry air to the lungs (bronchial tubes) within 5 minutes, increasing airflow and making it easier to breathe. They relieve asthma symptoms for 3 to 6 hours. They do not control the inflammation.

Short-acting beta2-agonists are used to:

• Provide quick relief of symptoms during asthma attacks.
• Prevent asthma symptoms before exercise.
• Treat symptoms in mild intermittent asthma.

How much of the medication you use depends on how severe your symptoms are. For more information, see:

• Asthma medications for adults, teens, and children older than age 5.
• Asthma medications for children age 5 and younger.

Short-acting beta2-agonists are the treatment of choice for relieving symptoms during asthma attacks and for treating intermittent asthma symptoms.¹ They are also used to relieve symptoms caused by exercise.

Research indicates that combining short-acting beta2-agonists and ipratropium in acute, severe asthma episodes, compared with using only beta2-agonists, resulted in:²

• Fewer hospital visits.
• Improved lung function.

Side effects of short-acting beta2-agonists are more likely to occur when using the pill, liquid, or injectable forms than when using the inhaled form. Side effects may include:

• Rapid heartbeat or palpitations.
• Headache and dizziness.
• Nausea, vomiting, and diarrhea.
• Anxiety.
• Hives and skin rash.
• Nervousness or tremor (such as unsteady, shaky hands).

See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)

Research indicates that frequent use of inhaled beta2-agonists may result in needing more of the medication to get the same results (tolerance) and may be associated with less effective control of asthma.³

If you need to use short-acting beta2-agonists on more than 2 days a week (except before exercise), you may need to start or increase long-term therapy. Discuss this with your doctor.

Levalbuterol is approved for use in children age 6 and older and in adults.

Nonprescription short-acting beta2-agonists (such as Primatene) should not be used to treat asthma symptoms without first talking with your health professional. Overuse of these products can delay medical care when it is really needed.

Short-acting beta2-agonists are the best treatment for quick relief of asthma episodes and for emergency situations. Using the inhaled form of a short-acting beta2-agonist is preferred for asthma treatment because it:

• Opens (dilates) bronchial tubes better than the pill or liquid form and does so at lower doses.
• Causes fewer side effects throughout the body than the oral form.
• Acts faster and lasts about as long as the oral form.

Because short-acting beta2-agonists work quickly to reduce symptoms, people sometimes overuse these medications instead of using the slower-acting long-term medications. But overuse of quick-relief medications has harmful effects, such as decreasing the future effectiveness of these medications.³

Try to avoid giving your child an inhaled medication when he or she is crying. In this case, not as much medication is delivered to the lungs.

Short-acting beta2-agonists should be used for intermittent asthma and quick relief of symptoms. They should not be used alone for persistent asthma.

Colds or other upper respiratory infections can cause asthma episodes in some people. Some health professionals recommend that people who have intermittent asthma use a short-acting beta2-agonist at the first sign of cold symptoms.⁴

Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.

Citations

1. Cydulka RK, Jarvis HE (2000). New medications for asthma. Emergency Medicine Clinics of North America, 18(4): 789–801.

2. Dennis RJ, et al. (2005). Asthma, search date May 2004. Online version of Clinical Evidence (14): 1847–1877.

3. Salpeter SR, et al. (2004). Meta-analysis: Respiratory tolerance to regular beta₂-agonist use in patients with asthma. Annals of Internal Medicine, 140(10): 802–813.

4. Mellins RB, et al. (2000). Developing and communicating a long-term treatment plan for asthma. American Family Physician, 61(8): 2419–2426.

Author:	Maria G. Essig, MS, ELS	Last Updated: May 15, 2007
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Harold S. Nelson, MD - Allergy and Immunology
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