<prompt> The most commonly used drug in open angle glaucoma is-PilocarpinePhysostigmineEpinephrineNone  <response>: Ans. is None Approach to treatment of open angle glaucoma o Sta monotherapy with topical b-blocker or latanoprost. If target i.o.t. is not attained either change over to the alternative drug or use both the above concurrently. o Brimonidinedorazolamidedipivefrine are used only when there are contraindications to PG analogues or b-blockers. o Topical miotics and oral acetazolamide are added only as the last reso. The most commonly used drugs for open angle glaucoma are b-blockers. Because of several drawbacks miotics pilocarpine are now used only as the last option. 