Hypersensitivity. Confirm malignancy of tumour prior to administration. Increased risk of GI tract infection. Risk for osteoporosis-related fractures of the hip, wrist or spine in patients receiving high-doses & long-term therapy (≥1 yr). Monitor Mg levels prior to treatment & periodically for patients on prolonged treatment or medications drugs that cause hypomagnesemia (eg, diuretics). May cause false +ve results in diagnostic investigations for neuroendocrine tumors. Hepatic or renal impairment. Pregnancy & lactation. Childn. Elderly.