Primary:

To determine the duration of use of zoledronic acid in improving Bone mineral density in patients with prostate cancer who are on hormones intermittently.

Secondary Objectives:

To describe the safety and tolerability at this dose and schedule

Inclusion Criteria:Patients: Who are 18 years of age and older Who have histologically documented adenocarcinoma of prostate Who are currently receiving LHRH agonists KPS greater than 80%Life expectancy greater than 6 months Provide written consent pursuant to regulatory requirements prior to initiation of study procedure Exclusion Criteria:Exclusion Criteria: Patients: Any patient requiring continuous LHRH Any patient who has had an orchiectomy Any patient with painful bone metastases Who have received chemotherapy for prostate cancer Who have a abnormal serum creatine >2.5 Receiving any investigational drug within the last 28 days Severe uncontrolled infection, diabetes, cardiac disease Patients with fragility fractures, hyperparathyroidism, Pagets renal osteodystrophy will be excluded History of non compliance to medical regimens or unwillingness to return for medical visits