My Doctor took me off of my Blood Pressure Medicine (Cardura) 4mg because he said I no longer need it. I have lost weight, and exercise regularly, and my BP is about 120/80. However, my creatinine level is 4.3, and he told me that he may start me on an ACEI, if i need it. I heard that these ACEI s can damage your liver and kidneys, and do not feel comfortable with this. Any suggestions. My Blood pressure has been very good even without the medicine.