In vitro in vivo reproterol showed intense spasmolytic effects upon the trachea and bronchi against various spasm-including agents (histamine, acetylcholine, acetyl-beta-methylcholine, 5-hydroxytryptamine, BaCl2). A comparative study with various drug used in the treatment of asthma (isoprenaline, metaproterenol, salbutamol, clenbuterol, papaverine and atropine) has been conducted.
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