You are 23 years old and your serum
creatinine level is high (3.4 mg/dL). I am assuming you have seen a doctor to find out what caused your
kidney damage. To answer your question, yes, you could take a supplement with
calcium and
vitamin D3 along with Ivabradine. You can take both medicines at the same time without any major side effects. Check your calcium, phosphorus,
alkaline phosphatase, and PTH levels in your blood on a regular basis so that you can adjust the amount of calcium and vitamin D3 you take.
Ivabradine slows down your heart rate and reduces the work load on your heart. It is given to you based on the condition of your heart.
You also said that your blood pressure remains high. It is recommended that you keep your blood pressure under control by consulting your doctor to find the best dose of BP-lowering medicine together with dietary and life-style modifications.
Next Steps
Follow-up with the local nephrologist