Bitolterol mesylate (Tornalate) is a β2-adrenergic receptor agonist used for the relief of bronchospasm in conditions such as asthma and COPD. 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 Bitolterol was withdrawn from the market by Élan Pharmaceuticals in 2001.
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