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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 works by binding to dietary phosphate in the gastrointestinal tract, forming insoluble calcium phosphate, which is then excreted.
## Primary Indications
* Hyperphosphatemia in patients with chronic kidney disease on dialysis.
## Adult Dosing
* **Initiation:** Typically start at 1-2 tablets with each meal.
* **Titration:** Dosage should be individualized based on serum phosphate levels.
* **Maximum:** Generally not to exceed 12 tablets (7.5 g) per day. Titrate upwards as needed to control serum phosphate.
## Pediatric Dosing
* Use in pediatric patients is not well-established. Dosing should be determined by a nephrologist based on individual patient needs and monitoring.
## Dose Adjustments
* No specific dose adjustments are typically required for renal or hepatic impairment, as the drug is primarily used in patients with CKD. However, careful monitoring of calcium levels is crucial.
## Contraindications
* Hypercalcemia.
* Hypersensitivity to calcium acetate or any component of the formulation.
* Conditions that may lead to hypercalcemia (e.g., patients with metastatic bone disease or certain endocrine disorders).
## Adverse Effects
* **Common:** Hypercalcemia (most significant), constipation, nausea, abdominal pain, dry mouth.
* **Serious:** Worsening of hypercalcemia can lead to cardiac arrhythmias, vascular calcification, nephrocalcinosis, and coma.
## Key Drug Interactions
* **Tetracyclines and Fluoroquinolones:** Calcium acetate can decrease the absorption of these antibiotics. Administer at least 2 hours before or 6 hours after calcium acetate.
* **Digoxin:** Hypercalcemia can increase the risk of digoxin toxicity.
* **Thiazide Diuretics:** Can increase the risk of hypercalcemia.
## Monitoring
* **Serum calcium:** Monitor frequently, especially during initiation and dose titration. Target serum calcium levels are variable and depend on clinical guidelines and patient factors.
* **Serum phosphate:** Monitor regularly to assess efficacy.
* **Serum magnesium and alkaline phosphatase:** May be monitored periodically.
## Clinical Pearls
* Administer with meals to ensure effective binding of dietary phosphate.
* Episodes of hypercalcemia must be managed promptly by adjusting the dose or temporarily discontinuing the medication.
* Educate patients on signs and symptoms of hypercalcemia.
* Dosing is highly individualized and requires close monitoring of laboratory parameters.
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*Please verify this information with the most current prescribing information and relevant clinical guidelines before use.*
