Mr. Rodriguez is a 50-year-old male with diabetes. He has been diagnosed with hypertension and congestive heart failure and is prescribed carvedilol (Coreg) 6.25 mg orally b.i.d.

a. What are the key teaching points for Mr. Rodriguez about carvedilol?
b. Explain why carvedilol is better than guanadrel to treat Mr. Rodriguez for his combined hypertension and congestive heart failure.