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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 excreted in the feces.
## Primary Indications
* Management of hyperphosphatemia in patients with end-stage renal disease (ESRD).
## Adult Dosing
* **Starting Dose:** 667 mg (equivalent to 169 mg elemental calcium) administered orally with each meal.
* **Titration:** Dose should be titrated based on serum phosphate levels. Typical maintenance doses range from 1334 mg to 2668 mg per day, divided among meals.
* **Maximum Dose:** No specific maximum dose is established in product labeling, but doses exceeding 2668 mg/day are generally not recommended due to the risk of hypercalcemia. Titration should aim to achieve target serum phosphate levels (typically < 5.5 mg/dL).
## Pediatric Dosing
* Dosing in pediatric patients is not well-established and should be individualized based on serum phosphate levels, calcium levels, and overall clinical status.
## Dose Adjustments
* **Hypercalcemia:** If hypercalcemia occurs, the dose of calcium acetate should be reduced or temporarily discontinued. Patients with a tendency towards hypercalcemia may require a lower dose.
* **Concurrent Calcium Supplementation:** Caution is advised when administering other calcium-containing products to avoid exceeding the total recommended daily intake of elemental calcium.
## Contraindications
* Hypercalcemia.
* Hypersensitivity to calcium acetate or any component of the formulation.
## Adverse Effects
* **Common:** Hypercalcemia, hypophosphatemia.
* **Less Common:** Nausea, vomiting, constipation, diarrhea, abdominal pain.
* **Serious:** Development of calcium-phosphate product deposition in soft tissues (rare).
## Key Drug Interactions
* **Tetracyclines and Fluoroquinolones:** Calcium acetate can decrease the absorption of these antibiotics. Administer at least 1 hour before or 3 hours after calcium acetate.
* **Thyroid Hormones (Levothyroxine):** Calcium acetate can decrease the absorption of levothyroxine. Administer levothyroxine at least 4 hours before or 4 hours after calcium acetate.
* **Certain Antacids:** Concurrent use may increase the risk of hypercalcemia.
## Monitoring
* **Serum Phosphate:** Monitor regularly (frequency determined by clinical status, typically before initiating therapy, at 1 week, 1 month, and every 3 months thereafter).
* **Serum Calcium:** Monitor regularly to detect and prevent hypercalcemia.
* **Alkaline Phosphatase:** May be monitored in patients with CKD.
## Clinical Pearls
* Administer calcium acetate with meals to maximize phosphate binding.
* The goal of therapy is to control serum phosphate levels, not necessarily to normalize them.
* Monitor for signs and symptoms of hypercalcemia (e.g., constipation, nausea, vomiting, polyuria, polydipsia, weakness, confusion).
* Consider the total calcium load from all sources (diet, supplements, phosphate binders) to avoid exceeding recommended limits.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making treatment decisions. Dosing and management may vary based on individual patient factors and local protocols.*
