Have had the worst side effects bad back pain severe muscle spasms in legs and feet and other areas of body. Exhausted can't sleep due to spasms. Have been to dr office nobody seems to have an answer except restless leg syndrome and gave me med for that and does not help. Never been so dam miserable in my life and had blood in urine now have to go for ct as culture showed no infection to see if I may have kidney stone and I'm just assuming myself according to researching on my own to much calcium can cause kidney stones as I am taking calcium supplement and presc vitamin D ... Will not be getting another shot ...