Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. These two drugs are used for different purposes, one for osteoporosis (low bone density) and one as a diuretic. The only interaction within these is hypocalcemia which is reduced calcium levels. It is a minor interaction which means is not often and is not severe. It is true that the doctor who prescribed them should have already balanced the benefits and risks of using them both and has thought that it is good to take it in your case. If you develop any symptoms or have any concerns please contact your doctor. Hope I have answered your query. Let me know if I can assist you further. Regards, Antoneta Zotaj