<prompt> A patient came to the casualty with acute bronchial asthma after treatment of glaucoma. The probable drug may beTimololBetaxololLatanoprostAnticholinesterase  <response>: Timolol is a non selective β blocker act on β1 β2 . β2 blocking effect of Timolol cause blockage of dilator β2 receptor so it can precipitate asthma. Whereas Betaxolol is cardioselective beta blocker that acts only on β2 receptor. 