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# Calcium Acetate
## Overview
Calcium acetate is a phosphate binder used to control hyperphosphatemia in patients with chronic kidney disease (CKD). It binds to dietary phosphate in the gastrointestinal tract, forming an insoluble calcium phosphate precipitate that is then eliminated in the feces.
## Primary Indications
* Treatment of hyperphosphatemia in patients with end-stage renal disease (ESRD).
## Adult Dosing
The goal is to reduce serum phosphate levels. Dosing is individualized based on serum phosphate levels and patient tolerance.
* **Initial Dose:** Start with 2 tablets (approximately 1334 mg elemental calcium) with meals.
* **Titration:** Increase dose gradually as needed.
* **Maximum Dose:** Generally not to exceed 16 tablets (approximately 10,672 mg elemental calcium) per day.
## Pediatric Dosing
Dosing in pediatric patients is not well-established and should be individualized by a specialist.
## Dose Adjustments
* **Renal Impairment:** Dose should be adjusted to maintain serum calcium levels within the normal range. Patients with CKD may require lower doses due to impaired calcium excretion.
* **Hypercalcemia:** If hypercalcemia occurs, the dose of calcium acetate should be reduced or discontinued.
## Contraindications
* Hypercalcemia.
* Hypersensitivity to calcium acetate or any component of the formulation.
* Patients with elevated serum calcium levels.
## Adverse Effects
The most common adverse effects are related to hypercalcemia, including:
* **Common:** Constipation, nausea, vomiting, hypercalcemia.
* **Serious:** Severe hypercalcemia (symptoms include anorexia, nausea, vomiting, constipation, abdominal pain, frequent urination, thirst, muscle weakness, headache, confusion, lethargy, cardiac arrhythmias). Vascular calcification.
## Key Drug Interactions
* **Tetracyclines and Fluoroquinolones:** Calcium acetate can decrease the absorption of these antibiotics. Administer them at least 2 hours before or 6 hours after calcium acetate.
* **Thyroid Hormones (e.g., Levothyroxine):** Calcium acetate can reduce the absorption of thyroid hormones. Separate administration by at least 4 hours.
* **Biphosphonates:** Calcium can interfere with the absorption of biphosphonates. Separate administration by at least 2 hours.
* **Digitalis Glycosides:** Hypercalcemia can increase the risk of digitalis toxicity.
* **Certain Antacids:** Concurrent use may increase the risk of hypercalcemia.
## Monitoring
* **Serum Phosphate:** Monitor regularly to assess efficacy.
* **Serum Calcium:** Monitor frequently, especially during dose titration, to prevent and detect hypercalcemia. Aim for serum calcium levels within the normal laboratory range.
* **Electrolytes:** Monitor other electrolytes as clinically indicated.
* **Alkaline Phosphatase:** May be monitored.
## Clinical Pearls
* Administer calcium acetate with meals to maximize phosphate binding.
* Individualize dosing based on frequent monitoring of serum phosphate and calcium levels.
* Be aware of the signs and symptoms of hypercalcemia and hyperphosphatemia.
* Educate patients on the importance of taking medication with meals and reporting any side effects.
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*This information is intended for healthcare professionals and does not substitute for professional medical advice. Always consult the current prescribing information and relevant guidelines before making any clinical decisions.*
