Assess patients prior to administration to ensure adequate hydration. Avoid overhydration in patients at risk of cardiac failure. Carefully monitor serum levels of Ca, phosphate & Mg after initiating therapy. Reports of renal dysfunction; osteonecrosis of the jaw (ONJ); osteonecrosis of the external auditory canal, mainly in association w/ long-term therapy; osteonecrosis of other sites, including hip & femur, predominantly in adult cancer patients; severe & occasionally incapacitating bone, joint, &/or muscle pain; atypical subtrochanteric & diaphyseal femoral fractures, primarily in patients receiving long-term treatment for osteoporosis; hypocalcaemia. Assess serum creatinine levels prior to each dose. W/hold treatment in patients who show evidence of renal deterioration during treatment. Delay start of treatment or new course of treatment in patients w/ unhealed open soft tissue lesions in the mouth, except in medical emergency situations. Avoid invasive dental procedures in close proximity to zoledronic acid administration. Do not concomitantly use w/ other zoledronic acid or any other bisphosphonate. Caution when administered w/ medicinal products known to cause hypocalcaemia. Patients should be adequately supplemented w/ Ca & vit D. May influence ability to drive or use machine. Not recommended in patients w/ severe renal impairment. Should not be used during pregnancy.