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# Calcium Acetate
## Overview
Calcium acetate is a phosphate binder used to reduce serum phosphate levels in patients with hyperphosphatemia, particularly those with chronic kidney disease (CKD) on dialysis.
## Primary Indications
* Management of hyperphosphatemia in patients with end-stage renal disease (ESRD).
## Adult Dosing
* **Initiation:** Typically 667 mg to 1332 mg (1-2 grams) of elemental calcium taken orally with meals.
* **Titration:** Doses should be adjusted based on serum phosphate levels. The goal is to maintain serum phosphate below 5.5 mg/dL.
* **Maximum dose:** While not definitively established in all guidelines, a commonly cited practical limit is around 3000 mg of elemental calcium per day (approximately 6 grams of calcium acetate). Higher doses increase the risk of hypercalcemia.
## Pediatric Dosing
* **Age 6 years and older:** Dosing varies based on patient weight and serum phosphate levels. Refer to specific pediatric guidelines or institutional protocols. For example, some sources suggest an initial dose of 10-15 mg/kg/day elemental calcium divided into 3 doses with meals, titrated up to a maximum of 100 mg/kg/day elemental calcium (not to exceed 3000 mg/day elemental calcium).
## Dose Adjustments
* **Renal Impairment:** This drug is used in patients with impaired renal function. However, caution is required, and careful monitoring of calcium and phosphate levels is essential.
* **Hepatic Impairment:** No specific dose adjustments are typically required, but monitoring is still important.
## Contraindications
* Hypercalcemia.
* Hypersensitivity to calcium acetate.
* Concomitant use with certain medications that can increase calcium levels (e.g., calcium supplements, vitamin D analogues).
## Adverse Effects
* **Common:** Hypercalcemia (especially with overdose or in susceptible patients), constipation, nausea, vomiting, abdominal pain, dry mouth.
* **Serious:** Severe hypercalcemia can lead to arrhythmias, confusion, coma, dehydration, kidney stones, and calcification of soft tissues.
## Key Drug Interactions
* **Antacids:** Concurrent use can increase calcium absorption and risk of hypercalcemia.
* **Digoxin:** Hypercalcemia can potentiate digoxin toxicity.
* **Tetracyclines and Quinolones:** Calcium acetate can chelate with these antibiotics, reducing their absorption. Administer at least 1 hour before or 3 hours after these antibiotics.
* **Vitamin D and analogues:** Concomitant use increases the risk of hypercalcemia.
* **Thiazide Diuretics:** May decrease urinary calcium excretion and increase the risk of hypercalcemia.
## Monitoring
* **Serum Calcium:** Monitor frequently, especially during initiation and dose titration, and periodically thereafter. Aim for serum calcium within the normal range, considering ionized calcium if available.
* **Serum Phosphate:** Monitor regularly to assess efficacy and guide dosing.
* **Alkaline Phosphatase:** May be monitored in patients with bone disease.
* **Renal function:** Monitor as clinically indicated.
## Clinical Pearls
* Calcium acetate must be taken with meals to effectively bind dietary phosphate.
* Ensure patients are aware of the signs and symptoms of hypercalcemia.
* The actual elemental calcium content varies by formulation; check product labeling. For example, calcium acetate 667 mg contains approximately 169 mg of elemental calcium.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and/or consult with a qualified healthcare provider before making any decisions about drug therapy. Dosing recommendations can vary based on institutional protocols, patient-specific factors, and evolving clinical guidelines.*
