hypatia is right, he needs to talk with his doc. FOr the record, betablockers are losing its appeal for treatment for primary hypertension.
http://cardiology.jwatch.org/cgi/content/full/2005/1125/1
Compared to ace inhibitiors and calcium channel blockers it does not prevent strokes as well, ( this only applies to first generation beta blockers like atenol)
ace inhibitors have a role in preventing renal disease if someone is diabetic with microalbuminuria
it is a very complicated subject and even though i am a doctor, you can't verify I am. Also, I would never treat or tell another doc how to manage another patient without examining him or knowing his creatinine, or does he have prediabetes ( in which case aces are the best) , african american, or possible development of renal artery stenosis, in which case aces are relatively contraindicated, does he have diastolic dysfunction, ( in which case a role for beta blockers is indicated again) , systolic heart failure, in which case aces and third generation beta blockers are the best etc. etc. etc.
it is not a black and white area
his urine may be more yellow because he is developing hyperbilirubinemia and in which case his liver is the problem