my father is 85, had ugi bleed, resolved, his bun has gradually gone from 45 to 83 in a month and his creatinine is 1.4,he is urinating normally, normal prostate, normal renal perfusion scan, he is on enalapril 5 mg, irbesartan 150/hctz12.5 and atenelol 50, on 2 medication for mild parkinson and atorvastatin for cholesterol, he weighs about 140 pounds, please advise how to bring his urea down, he also has 2 to 3 normal bowel movements per day