<prompt> A patient of glaucoma with bronchial asthma presents to the emergency with status asthamaticus, causative agent might have beenPilocarpine eye dropTimolol eye dropBetaxolol eye dropLevobunolol eye drop  <response>: Ans. is b i.e. Timolol eye drops Timolol maleate is the most widely used drug for open angle glaucoma.It is non-selective B blocker Blocks both B1 and B2B2 is responsible for bronchodilation, therefore blocking B2 would aggravate asthma.Instead of Timolol, Betaxolol can be used because it is a selective B1 blocker and causes less respiratory side effects. 