PHOSEX Tablet Ref.[49966] Active ingredients: Calcium acetate

The use of phosphate binders in renal failure should be in conjunction with dietary advice regarding phosphate intake and methods of dialysis appropriate to the patient.

The dose will need to be adjusted depending on phosphate intake or removal by dialysis and on the ensuing effect on serum calcium. This requires regular monitoring, for example weekly, of both the serum phosphate and calcium levels to determine efficacy and prevent hypercalcaemia.

If hypercalcaemia occurs, the dosage should be reduced or the treatment withdrawn temporarily, depending on the degree of hypercalcaemia. The risk of hypercalcaemia needs to be considered particularly during concomitant treatment with Vitamin D preparations.

The concomitant administration of calcium and vitamin D derivatives is to be made under the supervision of a physician.

Patients suffering with progressive renal failure may exhibit signs of, and should be warned of the symptoms of, hypercalcaemia, ectopic or vascular calcification, or adynamic bone disease. Regular monitoring is required since caution is needed in administering Phosex under these circumstances.

The long-term toxicity of Phosex has not been evaluated in clinical trials. In particular during long-term phosphate binding therapy with calcium salts there have been reports of tissue calcifications. It is not known whether the risk of calcification is higher with Phosex than with other calcium salts.

Patients should be advised to seek medical advice before taking non-prescription antacids containing calcium carbonate or other calcium salts to avoid adding to the calcium load.

Calcium interacts with several drugs:

• The absorption of antibiotics such as ciprofloxacin, enoxacin, norfloxacin, tetracyclines (PO) can be affected and consequently, the intake of Phosex should be made 3 hours before or after the antimicrobial treatment.
• Vitamin D preparations may require dosage modification to avoid hypercalcaemia.
• Digitalis glycosides, verapamil and gallopamil in the presence of hypercalcaemia can enhance cardiac effects and can lead to cardiac toxicity. Therefore, special precautions for use (ECG and biological surveillance) are to be taken.

No data available. It is not known whether Phosex can cause foetal effects when administered during pregnancy or whether it can affect reproductive capacity.

Phosex should only be administered to pregnant or lactating women if it is clearly indicated.

No effects on the ability to drive and use machines have been observed.

Uncommon (0.1% - 1%) Undesirable effects are nausea, vomiting, diarrhoea and constipation.

Hypercalcaemia can occur and the serum levels of total and ionised calcium should be monitored. Mild hypercalcaemia (Ca >2.6 mmol/L) may occur in about 1% of patients and may be asymptomatic or manifest itself as constipation, anorexia, nausea and vomiting. More severe hypercalcaemia (Ca >3.0 mmol/L) may occur in about 0.1% of patients and can be associated with confusion, delirium, stupor and in very severe cases coma. Patients should be advised to consult their doctor if any of these symptoms occur.

Not applicable.