ELIPHOS — calcium acetate tablet
Hawthorn Pharmaceutical, Inc.
ELIPHOS® is a phosphate binder indicated to reduce serum phosphorus in patients with end stage renal disease (ESRD).
The recommended initial dose of ELIPHOS ® for the adult dialysis patient is 2 tablets with each meal. Increase the dose gradually to lower serum phosphorus levels to the target range, as long as hypercalcemia does not develop. Most patients require 3-4 tablets with each meal.
Tablet: 667 mg calcium acetate per tablet.
Patients with hypercalcemia.
Patients with end stage renal disease may develop hypercalcemia when treated with calcium, including calcium acetate (ELIPHOS® ). Avoid the use of calcium supplements, including calcium-based nonprescription antacids, concurrently with ELIPHOS®.
An overdose of ELIPHOS® may lead to progressive hypercalcemia, which may require emergency measures. Therefore, early in the treatment phase during the dosage adjustment period, monitor serum calcium levels twice weekly. Should hypercalcemia develop, reduce the ELIPHOS® dosage, or discontinue the treatment, depending on the severity of hypercalcemia.
More severe hypercalcemia (Ca >12 mg/dL) is associated with confusion, delirium, stupor and coma. Severe hypercalcemia can be treated by acute hemodialysis and discontinuing ELIPHOS® therapy.
Mild hypercalcemia (10.5 to 11.9 mg/dL) may be asymptomatic or manifest as constipation, anorexia, nausea, and vomiting. Mild hypercalcemia is usually controlled by reducing the ELIPHOS® dose or temporarily discontinuing therapy. Decreasing or discontinuing Vitamin D therapy is recommended as well.
Chronic hypercalcemia may lead to vascular calcification and other soft-tissue calcification. Radiographic evaluation of suspected anatomical regions may be helpful in early detection of soft tissue calcification. The long term effect of ELIPHOS® on the progression of vascular or soft tissue calcification has not been determined.
Hypercalcemia (>11 mg/dL) was reported in 16% of patients in a 3-month study of solid dose formulation of calcium acetate; all cases resolved upon lowering the dose or discontinuing treatment.
Maintain the serum calcium-phosphorus (Ca × P) product below 55 mg2 /dL2 .
Hypercalcemia may aggravate digitalis toxicity.
Hypercalcemia is discussed elsewhere [see Warnings and Precautions (5.1)]
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
In clinical studies, calcium acetate has been generally well tolerated.
Calcium acetate was studied in a 3-month, open-label, non-randomized study of 98 enrolled ESRD hemodialysis patients and an alternate liquid formulation of calcium acetate was studied in a two week double-blind, placebo-controlled, cross-over study with 69 enrolled ESRD hemodialysis patients. Adverse reactions (>2% on treatment) from these trials are presented in Table 1.
|Preferred Term||Total adverse reactions reported for calcium acetate |
|3-mo, open-label study of calcium acetate |
|Double blind, placebo-controlled, cross-over study of liquid calcium acetate |
|Calcium acetate |
|Nausea||6 (3.6)||6 (6.1)||0 (0.0)||0 (0.0)|
|Vomiting||4 (2.4)||4 (4.1)||0 (0.0)||0 (0.0)|
|Hypercalcemia||21 (12.6)||16 (16.3)||5 (7.2)||0 (0.0)|
Mild hypercalcemia may be asymptomatic or manifest itself as constipation, anorexia, nausea, and vomiting. More severe hypercalcemia is associated with confusion, delirium, stupor, and coma. Decreasing dialysate calcium concentration could reduce the incidence and severity of ELIPHOS® - induced hypercalcemia. Isolated cases of pruritus have been reported, which may represent allergic reactions.
Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency or to establish a causal relationship to drug exposure.
The following additional adverse reactions have been identified during post-approval of calcium acetate: dizziness, edema, and weakness.
The drug interaction of ELIPHOS® is characterized by the potential of calcium to bind to drugs with anionic functions (e.g., carboxyl, and hydroxyl groups). ELIPHOS® may decrease the bioavailability of tetracyclines or fluoroquinolones via this mechanism.
There are no empirical data on avoiding drug interactions between calcium acetate or ELIPHOS® and most concomitant drugs. When administering an oral medication with ELIPHOS® where a reduction in the bioavailability of that medication would have a clinically significant effect on its safety or efficacy, administer the drug one hour before or three hours after ELIPHOS® or calcium acetate. Monitor blood levels of the concomitant drugs that have a narrow therapeutic range. Patients taking anti-arrhythmic medications for the control of arrhythmias and anti-seizure medications for the control of seizure disorders were excluded from the clinical trials with all forms of calcium acetate.
In a study of 15 healthy subjects, a co-administered single dose of 4 calcium acetate tablets, approximately 2.7g, decreased the bioavailability of ciprofloxacin by approximately 50%.
Pregnancy Category C
ELIPHOS® contains calcium acetate. Animal reproduction studies have not been conducted with calcium acetate tablets, and there are no adequate and well controlled studies of calcium acetate tablets use in pregnant women. Patients with end stage renal disease may develop hypercalcemia with calcium acetate treatment [see Warnings and Precautions (5.1)]. Maintenance of normal serum calcium levels is important for maternal and fetal well being. Hypercalcemia during pregnancy may increase the risk for maternal and neonatal complications such as stillbirth, preterm delivery, and neonatal hypocalcemia and hypoparathyroidism. ELIPHOS® treatment, as recommended, is not expected to harm a fetus if maternal calcium levels are properly monitored during and following treatment.
The effects of ELIPHOS® on labor and delivery are unknown.
ELIPHOS® contains calcium acetate and is excreted in human milk. Human milk feeding by a mother receiving ELIPHOS® is not expected to harm an infant, provided maternal serum calcium levels are appropriately monitored.
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