I have pain in my kidneys when walking longer distances (6 to 8 km). I am currently taking nitrofurantoin and ciprinol. Can I keep walking?

Pain. How you know that the pain is related to your kidneys is the obvious question. If you have had kidney stones previously you need to be seen by a nephrologist or urologist and evaluated thoroughly. Hopefully you are not on chronic nitrofurantoin. This is a potentially quite dangerous medication, and if you have kidney infection it will do nothing for you. Ciprofloxacin may or may not be helpful.