One thing the drug company forgot to mention was if one is allergic to penicillin than one can be allergic to keflex. And in this case keflex can cause kidney failure. It just so happens that I am allergic to penicillin. So the likely suspect was keflex. I feel better now the Anemia is almost gone and I can keep calcium levels down with coffee and soda pop. I hope my kidney function returns to normal.