thymoxamine is a selective alpha sympathetic blocking agent which may be used to stop the mydriasis induces by phenylephrine , ( `` '' safe mydriasis '' '' ) , to differentiate an open but narrow angle glaucoma from an angle closure glaucoma , to treat an acute closure and to induce miosis without shallowing of the anterior chamber before laser trabeculoplasty .
C0031469
phenylephrine
C0026961
mydriasi