2.B receptor antagonists n(2) Intrinsic sympathomimetic effects Some drugs:HR↑, output个 d 3) Membrane-stabilizing effects n Larger doses of some drugs: quinidine-like effects due to nat channel block n(4)Others u Lowering intraocular pressure Inhibiting platelet aggregation(2) Intrinsic sympathomimetic effects Some drugs: HR , output  (3) Membrane-stabilizing effects Larger doses of some drugs: quinidine-like effects due to Na+ channel block (4) Others Lowering intraocular pressure; Inhibiting platelet aggregation 2.  receptor antagonists