3. Bone mineral density (BMD) values of less than 1 standard deviations (SD) below the normal adult mean.
4. Willing to participate in this study.
You may not be if
1. Hypersensitivity to zoledronic acid or other bisphosphonate or zoledronic acid formulation (excipients).
2. Secondary osteoporosis.
3. Receiving the following drugs that affect bone metabolism prior to randomization:
(1) intravenous biphosphonates or denosumab. (2) oral biphosphonates, parathyroid hormone or its analogues, strontium, or fluoride within 12 months.
(3) glucocorticoid, steroids, immunosuppressive agents, calcitonin, calcitriol or its analogues, thiazides diuretics, long-acting estrogen/progesterone, or statins within 3 months.
4\. Combine other diseases affect bone metabolism: osteogenesis imperfecta, hyperthyroidism, malignant tumors, Paget's disease, rheumatoid arthritis, osteomalacia, osteopetrosis, ankylosing spondylitis, liver failure, or renal failure.
5\. Hyperthyroidism or hypothyroidism during screening.
6\. Treatment with any investigational drug within the past 3 months.
