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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline laxative that works by drawing water into the colon, softening stool and stimulating bowel evacuation.
## Primary Indications
* Bowel preparation for colonoscopy or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema is administered rectally. For some protocols, a second dose may be given 4-12 hours after the first. Strict adherence to specific pre-procedure instructions is critical.
* **Constipation:** One 4.5 oz (133 mL) enema administered rectally.
## Pediatric Dosing
* **Children 5-11 years:** One 2.25 oz (66.5 mL) enema administered rectally.
* **Children under 5 years:** Contraindicated due to risk of severe electrolyte abnormalities and toxicity.
## Dose Adjustments
No dose adjustments are typically needed in patients with renal or hepatic impairment, but caution is advised due to potential for electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Severe renal impairment (CrCl < 30 mL/min).
* Congestive heart failure.
* Gastric retention.
* Children under 5 years of age.
* Patients on medications that may affect renal function or hydration (e.g., diuretics, ACE inhibitors, ARBs).
* Use with caution in elderly patients and those with impaired kidney function.
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, rectal irritation, bloating.
* **Serious:** Severe electrolyte disturbances including hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, dehydration, cardiac arrhythmias, kidney damage (acute tubular necrosis, renal failure), seizures, and rarely death. These risks are significantly increased with overuse, rapid administration, or in patients with contraindications.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia and acute kidney injury due to volume depletion.
* **Calcium supplements, antacids containing calcium or magnesium:** May exacerbate hyperphosphatemia.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, dry mouth, decreased urine output, dizziness, confusion, muscle cramps, irregular heartbeat).
* Consider serum electrolytes and renal function, especially in patients with risk factors or if multiple doses are administered.
## Clinical Pearls
* This medication should be used as a single-use rectal enema only.
* Ensure patients understand and follow administration instructions precisely to minimize risks.
* Do not use if rectal bleeding occurs or if bowel movements do not occur after use.
* Patient education on fluid intake is crucial, particularly for bowel preparation.
* The potential for serious electrolyte abnormalities and renal injury cannot be overstated, especially in at-risk populations.
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*Please verify the current prescribing information for definitive details.*
