Metropolol and now coreg (carvedilol)...sinus issues...why do beta blockers cause this ....any suggestions as to one that may not?

Beta 1 selective: Beta 1 is found in the heart b2 receptors are found in the lungs and respiratory system.If one takes a beta blocker that it nonselective it can act on the heart and lower the blood pressure but can act on the lung and potentially cause a cough. This is why beta blocker can potentially cause coughing in asthmatics. You should talk to your pcp if symptoms or side effects continue. Good luck.