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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel evacuation.
## Primary Indications
Bowel preparation prior to colonoscopy or surgery; relief of occasional constipation.
## Adult Dosing
* **Bowel preparation:** Typically 1 bottle (4.5 ounces or 133 mL) administered as a single dose. May require a second dose 4-12 hours later if bowel is not clear, as per institutional protocol.
* **Constipation relief:** Typically 2.25 ounces (66 mL) administered as a single dose. Maximum 1 dose in 24 hours.
## Pediatric Dosing
* **Children 2-11 years:** 2.25 ounces (66 mL) as a single dose.
* **Children under 2 years:** Safety and efficacy not established. Use is generally not recommended due to increased risk of fluid and electrolyte disturbances.
## Dose Adjustments
No specific dose adjustments are routinely recommended for renal or hepatic impairment. However, caution is advised in these populations due to potential for electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Bowel obstruction or perforation.
* Ileus.
* Congenital malformations of the colon.
* Severe renal impairment (CrCl < 30 mL/min).
* Heart failure.
* Children under 2 years of age.
* Patients with conditions that increase risk of electrolyte imbalance (e.g., impaired thirst, concurrent diuretic use).
## Adverse Effects
Common: Abdominal pain, bloating, nausea, vomiting, rectal irritation.
Serious: Hyperphosphatemia, hypocalcemia, hypernatremia, metabolic acidosis, dehydration, renal injury, cardiac arrhythmias. Fatalities have been reported.
## Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalance.
* **Drugs affecting renal function (e.g., NSAIDs, ACE inhibitors):** Increased risk of acute kidney injury and electrolyte disturbances.
* **Calcium supplements, antacids:** May bind phosphate, potentially reducing absorption but also increasing risk of hypocalcemia.
## Monitoring
* Assess for signs of dehydration (thirst, dry mouth, decreased urine output).
* Monitor electrolytes (phosphate, calcium, sodium) especially in high-risk patients or with repeat dosing.
* Assess for abdominal distension, severe pain, or rectal bleeding, which may indicate perforation or obstruction.
## Clinical Pearls
* Administer slowly and encourage retention for optimal effect.
* Ensure adequate fluid intake before and after administration.
* Avoid concurrent use with other bowel preparation agents unless specifically directed by a healthcare provider.
* Use with extreme caution in elderly patients, those with renal impairment, or any condition that may affect fluid and electrolyte balance.
**Disclaimer:** This information is intended for healthcare professionals. Always consult the current prescribing information and institutional protocols before making clinical decisions.
