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Arformoterol tartrate is a salt of Arformoterol, the (R,R)-enantiomer of formoterol. Arformoterol is a selective beta 2-adrenergic bronchodilator. It has two-fold greater potency than racemic formoterol which contains both the (S,S) and (R,R)-enantiomers. The (S,S)-enantiomer is about 1,000-fold less potent as a beta2-agonist than the (R,R)-enantiomer. In vitro tests show that arformoterol is an inhibitor of the release of mast cell mediators, such as histamine and leukotrienes, from the human lung.