Reproterol is a short-acting β2 adrenoreceptor agonist used in the treatment of asthma. Reproterol increases the generation of cAMP in isolated peripheral blood monocytes in vitro more effectively than does orciprenaline. In the presence of the highly potent but nonselective ß-antagonist, propranolol, the cAMP-generating action of reproterol was inhibited only partially. Reproterol has gained wide use when it was licensed as a fixed combination therapy with cromoglycate. Until today, the bronchodilator effects of reproterol and the bronchoprotective and anti-inflammatory actions of cromoglycate combined in one inhaler remain the successful fixed combination of a disease-modifying and symptomatic drug for the treatment of asthma.