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## Calcium Acetate
### Overview
Calcium acetate is a phosphate binder used to reduce serum phosphorus levels in patients with hyperphosphatemia, most commonly associated with chronic kidney disease (CKD). It works by binding to dietary phosphate in the gastrointestinal tract, preventing its absorption.
### Primary Indications
* Management of hyperphosphatemia in patients with end-stage renal disease (ESRD).
### Adult Dosing
* **Dosage Range:** 2 to 4 tablets (667 mg to 1333 mg of calcium acetate) with each meal.
* **Typical Starting Dose:** 2 tablets (667 mg) with each meal.
* **Titration:** Dose should be adjusted based on serum phosphorus levels. The goal is to maintain serum phosphorus below 6 mg/dL.
* **Maximum Dose:** The total daily elemental calcium intake from calcium acetate should not exceed the recommended daily allowance (RDA) for calcium in CKD patients or result in hypercalcemia. The maximum recommended dose is typically around 4 grams of calcium acetate (12 tablets) per day, divided among meals, but this can vary based on individual patient response and tolerance.
### Pediatric Dosing
* Limited data exists for pediatric use. Dosing should be individualized and guided by serum phosphorus levels. Consult specialized pediatric nephrology resources for specific recommendations.
### Dose Adjustments
* **Renal Impairment:** Dose reduction is generally not applicable as the primary indication is in patients with significant renal impairment. However, careful monitoring for hypercalcemia is crucial.
* **Hepatic Impairment:** No specific dose adjustments are typically required.
### Contraindications
* Hypercalcemia.
* Hypersensitivity to calcium acetate or any component of the formulation.
* In patients with elevated serum calcium levels, particularly those undergoing dialysis.
### Adverse Effects
* **Common:** Gastrointestinal disturbances such as nausea, vomiting, constipation, diarrhea.
* **Serious:** Hypercalcemia (symptoms include lethargy, confusion, anorexia, polyuria, polydipsia, constipation, abdominal pain, nausea, vomiting, muscle weakness, bone pain, cardiac arrhythmias). Development of calcium-containing kidney stones or other calcifications.
### Key Drug Interactions
* **Tetracyclines and Fluoroquinolones:** Calcium acetate can decrease the absorption of these antibiotics. Administer them at least 2 hours before or 3 hours after calcium acetate.
* **Thyroid Hormones (e.g., Levothyroxine):** Calcium acetate can impair the absorption of thyroid hormones. Separate administration by at least 4 hours.
* **Certain Antiretrovirals:** Calcium acetate may decrease the absorption of some antiretroviral medications. Consult specific drug information.
* **Vitamin D and its analogues:** May increase the risk of hypercalcemia. Use with caution and monitor calcium levels closely.
### Monitoring
* **Serum Phosphorus:** Monitor regularly (frequency determined by clinical status and response, often weekly initially, then monthly).
* **Serum Calcium:** Monitor regularly to detect and prevent hypercalcemia.
* **Alkaline Phosphatase:** May be monitored as an indicator of bone disease.
* **BUN and Creatinine:** Monitor in patients with CKD.
### Clinical Pearls
* Calcium acetate is most effective when taken with meals to bind dietary phosphate.
* The target serum phosphorus level is typically less than 6 mg/dL.
* Hypercalcemia is a significant risk, especially in patients with CKD and those taking vitamin D supplements. Monitor calcium levels closely.
* Patients should be educated on signs and symptoms of hypercalcemia.
* Different formulations (e.g., capsules, tablets) may have varying amounts of elemental calcium per dosage unit; always verify the amount of elemental calcium.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines for definitive guidance. Clinical decisions should be based on individual patient assessment and current evidence-based practice.*
