Timolol maleate
(S)-timolol maleate is the maleic acid salt of the active (S)-enantiomer of timolol, comprising equimolar amounts of (S)-timolol and maleic acid. It has a role as an antihypertensive agent, an anti-arrhythmia drug, a beta-adrenergic antagonist and an antiglaucoma drug. It contains a (S)-timolol (anhydrous).