Hello dr, my mother is having upper back and shoulder pain for 5-6 weeks. We initially took painkillers on dr's recommendation. After consulting a pain management specialist, she has recommended vit D injections (arachitol 600 000 IU) for 4 weeks. One per week. Is it safe to take so much Vit D via injections? Her Vit D is around 8. Dr has also prescribed Calcium tablets. Given that my mother has kidney stone, is it ok to take calcium tablets?