Bitolterol
Encyclopedia
Bitolterol mesylate is a β2-adrenergic receptor agonist
Beta2-adrenergic receptor agonist
β2-adrenergic agonists, also known as β2-adrenergic receptor agonists, are a class of drugs used to treat asthma and other pulmonary disease states.-Uses:...

 used for the relief of bronchospasm
Bronchospasm
Bronchospasm or a bronchial spasm is a sudden constriction of the muscles in the walls of the bronchioles. It is caused by the release of substances from mast cells or basophils under the influence of anaphylatoxins...

 in conditions such as asthma
Asthma
Asthma is the common chronic inflammatory disease of the airways characterized by variable and recurring symptoms, reversible airflow obstruction, and bronchospasm. Symptoms include wheezing, coughing, chest tightness, and shortness of breath...

 and COPD
Chronic obstructive pulmonary disease
Chronic obstructive pulmonary disease , also known as chronic obstructive lung disease , chronic obstructive airway disease , chronic airflow limitation and chronic obstructive respiratory disease , is the co-occurrence of chronic bronchitis and emphysema, a pair of commonly co-existing diseases...

.

Bitolterol has a rapid onset of action (2–5 minutes) and may last up to 6–8 hours.

Bitolterol was withdrawn from the market by Élan Pharmaceuticals
Élan
Élan Corporation plc is a major drugs firm based in Athlone, County Roscommon, Ireland which has major interests in the United States. In the late 1990s its value on the Irish Stock Exchange reached over €20bn. It has secondary listings on the London Stock Exchange and the New York Stock Exchange....

 in 2001.
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