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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline laxative used for bowel evacuation.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Treatment of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically 1 (4.5 fl oz) prefilled enema administered 3-5 hours before the procedure. Some protocols may recommend a second dose if needed.
* **Constipation:** Typically 1 (4.5 fl oz) prefilled enema as a single dose.
## Pediatric Dosing
* **Ages 5-11 years:** 1/2 (2.25 fl oz) of the adult dose (2.25 fl oz) administered as a single dose.
* **Under 5 years:** Not generally recommended due to increased risk of electrolyte abnormalities. Consult pediatrician for specific guidance.
## Dose Adjustments
No dose adjustments are typically needed based on renal or hepatic impairment, but caution is advised in patients with pre-existing electrolyte imbalances or kidney disease.
## Contraindications
* Congenital or acquired megacolon.
* Heart failure, severe renal impairment, ascites, intestinal obstruction, or patients on diuretics or other medications that can affect electrolytes.
* Children younger than 2 years of age.
* Known hypersensitivity to sodium phosphate.
* Patients with ileostomy or colostomy.
## Adverse Effects
Common: Abdominal cramping, nausea, vomiting, bloating, anal irritation.
Serious: Hyperphosphatemia, hypocalcemia, hypokalemia, hypernatremia, dehydration, cardiac arrhythmias, renal failure, seizures.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia and renal dysfunction.
* **Calcium supplements:** May increase the risk of hyperphosphatemia.
## Monitoring
* Electrolytes (phosphate, calcium, sodium, potassium) should be monitored, especially in patients with risk factors for electrolyte imbalances or those receiving repeated doses.
* Renal function.
## Clinical Pearls
* Ensure adequate hydration before and after administration.
* Administer slowly and allow the solution to remain in the rectum for the prescribed time (usually 5-15 minutes).
* Avoid use in elderly, debilitated, or very young patients due to increased risk of electrolyte disturbances.
* Consider alternative agents for bowel preparation in patients with renal insufficiency or heart failure.
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*Please verify current prescribing information before administration.*
