Polycystic Kidney Disease (PKD) Support Group
Polycystic kidney disease (PKD) is a progressive, genetic disorder of the kidneys. It occurs in humans and other organisms. PKD is characterised by the presence of multiple cysts (polycystic) in both kidneys. The disease can also damage the liver, pancreas and rarely the heart and brain.
http://www.healthline.com/health/pregnancy/chronic-hypertension-medicine
The other thing to consider is whether you are doing all you can with diet and exercise to keep your BP down. I managed to keep off BP meds for years by strictly eliminating sodium from my diet and still keep to this diet. My kidney function is at 30% and I still only take a tiny dose of Losartan.