Chantix is a relatively new medicine and all the possible side effects are not yet fully determined. It can affect the kidneys so any urinary tract symptoms are important to describe to your medical professional who prescribed the medication. Be sure you are taking it exactly as prescribed, the correct amounts and that you are not taking it for longer than the prescription said to be taking it. Report any unusual symptoms, like blood in the urine, to a medical professional. A pharmacist can also advise you about the side effects of Chantix.