Hello, Thank you for your contact to healthcare magic. I understand your health concern, if I am your doctor I suggest you that since your father has diabetes and high blood pressure. Such chronic illness can cause chronic damage to the kidney. Once the kidney function is compromised it leads to rise in the creatinine which is usually filtered by the kidney. To remove the creatinine out of body it is necessary to take the diuretics under your local doctors guidance. I will be happy to answer all your future concern. Thank you, Dr Arun Tank Infectious disease specialist. Wish you a best health at health care magic.