CRF, Asthma with uncontrolled BP

70 years female, a diagnosed case of Chronic renal failure, Hypertension, Ischemic heart disease, Diabetes mellitus II, Bronchial Asthma. She is getting S-Amlodipine 5 mg twice daily, Prazosin 5 mg twice daily and Frusemide 40mg twice daily. Her BP is still 170/100 mm Hg with above medications. Beta blockers and ACE-I couldn't be added for Bronchial asthma and Renal failure respectively. What other anti-hypertensives can be added to her treatment for better control of BP?