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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a stimulant laxative for the evacuation of the bowel. It works by drawing water into the colon, softening stool and stimulating peristalsis.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, barium enema).
* Relief of occasional constipation.
## Adult Dosing
* **Constipation:** Typically, a single dose of 4.5 ounces (133 mL) of the 15% solution.
* **Bowel Preparation:** Typically, a single dose of 4.5 ounces (133 mL) of the 15% solution, administered 2-5 hours before the procedure. Some protocols may use 2.5 ounces (75 mL) for less intensive cleansing.
## Pediatric Dosing
* **Constipation:**
* Ages 0-2 years: Not recommended due to risk of severe toxicity.
* Ages 2-5 years: 1/4 of adult dose (approximately 1.1 ounces or 33 mL).
* Ages 6-11 years: 1/2 of adult dose (approximately 2.25 ounces or 66 mL).
* Ages 12 years and older: Full adult dose (4.5 ounces or 133 mL).
* **Bowel Preparation:** Dosing for pediatric patients should follow specific institutional protocols, as there is less established guidance and higher risk.
## Dose Adjustments
* No dose adjustments are typically needed for renal or hepatic impairment, but caution is warranted due to electrolyte imbalance risks.
## Contraindications
* Congestive heart failure.
* Renal impairment (severe).
* Ascites.
* Intestinal obstruction.
* Congenital megacolon.
* Ileus.
* Children under 2 years of age.
* Patients with impaired gag reflex.
* Patients with known or suspected hypersensitivity to sodium phosphate.
* Patients on medications that prolong the QT interval.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte imbalances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, metabolic acidosis. This can lead to cardiac arrhythmias, seizures, tetany, and renal failure.
* **Dehydration.**
* **Hypersensitivity reactions.**
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte depletion.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia.
* **Medications prolonging QT interval:** Increased risk of cardiac arrhythmias due to electrolyte disturbances.
* **Calcium supplements/Antacids:** May reduce the efficacy of the enema.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalances (e.g., nausea, vomiting, dizziness, muscle cramps, confusion, changes in heart rate or rhythm).
* Electrolyte panels (phosphate, calcium, sodium, potassium) may be warranted in patients with risk factors for imbalance, especially pediatric patients or those with renal impairment.
## Clinical Pearls
* Administer slowly and ensure the patient retains the enema for the prescribed duration (typically 5-10 minutes or as tolerated).
* Educate patients on potential side effects and signs of dehydration or electrolyte imbalance.
* Due to the risk of severe electrolyte disturbances and renal injury, particularly in susceptible populations, alternatives are often preferred for bowel preparation when possible.
* Refrigerating the enema may improve comfort during administration.
* Avoid use in patients with significant underlying gastrointestinal conditions or those taking other bowel-altering medications without careful consideration.
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*This information is intended for healthcare professionals. Please consult the most current prescribing information and institutional protocols for complete details.*
