I stopped taking Fosamax after 10+ years. Dr. ran urine tests which showed NTX was fine at 21. 24hr urine calcium was high @ 272mg/day (normal 100-200/day); says not retaining calcium; begin HCTZ 12.5mg, 1xday. Why? I have increased my calcium, mag, zinc and added K2, but have not filled the HCTZ. If it's a diuretic, will that not increase the urine calcium I am excreting? Also, I have asthma, listed on the caution list for HCTZ.