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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema (saline laxative) is a hypertonic osmotic agent that acts by drawing water into the colon, promoting distension and peristalsis. It is intended for short-term relief of constipation or bowel preparation.
## Primary Indications
* Constipation (occasional relief)
* Bowel evacuation prior to diagnostic or surgical procedures
## Adult Dosing
* **Standard dose:** 118 mL (one ready-to-use bottle) administered rectally as a single dose. Do not exceed one dose per 24 hours.
## Pediatric Dosing
* **Children 2 to 11 years:** 59 mL (pediatric size) administered rectally as a single dose.
* **Children < 2 years:** Generally contraindicated due to high risk of electrolyte disturbances.
* *Note: Always use age-appropriate formulations.*
## Dose Adjustments
* **Renal Impairment:** Use with extreme caution. Severe hyperphosphatemia and hypocalcemia have been reported in patients with renal insufficiency.
* **Dehydration:** Correct fluid/electrolyte imbalances prior to administration.
## Contraindications
* Hypersensitivity to sodium phosphate.
* Known or suspected bowel obstruction, megacolon, imperforate anus, or inflammatory bowel disease (ulcerative colitis).
* Congestive heart failure, clinically significant renal impairment, or ascites (risk of fluid/electrolyte shift).
## Adverse Effects
* **Common:** Abdominal pain, cramping, nausea, irritation of the rectal mucosa.
* **Serious:** Severe electrolyte disturbances (hyperphosphatemia, hypocalcemia, hypokalemia, hypernatremia), dehydration, metabolic acidosis, and cardiovascular collapse (rare).
## Key Drug Interactions
* **Calcium Channel Blockers/Diuretics:** Potentiates risk of electrolyte imbalances or renal impairment.
* **Parathyroid medications:** May be affected by significantly altered serum phosphate/calcium levels.
* **Avoid** concurrent use with oral sodium phosphate purgatives or other laxatives to prevent toxic electrolyte accumulation.
## Monitoring
* Monitor serum electrolytes (phosphate, calcium, potassium, sodium) and renal function tests (BUN/SCr) in high-risk patients.
* Monitor for clinical signs of dehydration or electrolyte toxicity (e.g., muscle tetany, altered mental status).
## Clinical Pearls
* **Administration:** Patient should be in the left lateral decubitus position (Sims' position) for insertion. Lubricate the tip before insertion to prevent mucosal trauma.
* **Effect time:** Usually effective within 2 to 15 minutes.
* **Safety Warning:** Frequent or prolonged use is contraindicated as it may lead to dependency or serious electrolyte derangements.
* **Dehydration Mitigation:** Encourage intake of clear liquids prior to and after administration to prevent hypovolemia.
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*Disclaimer: This information is for educational purposes and is not a substitute for professional clinical judgment. Always verify current prescribing information, institutional protocols, and patient-specific factors before administration.*
