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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution that acts as a saline laxative by drawing water into the colon, which softens stool and stimulates bowel evacuation.
## Primary Indications
Bowel preparation prior to colonoscopy or surgery. Relief of occasional constipation.
## Adult Dosing
**Bowel Preparation:** Typically 1 (4.5 fl oz) enema administered 2-5 hours before the procedure. Some protocols may recommend a second dose.
**Constipation:** Typically 1 (4.5 fl fl oz) enema administered as a single dose. Do not use more than one enema in a 24-hour period.
## Pediatric Dosing
**Children 2-11 years:** Use with caution. A typical dose is 2.25 fl oz. Consult product labeling or prescriber for specific guidance.
**Children under 2 years:** Contraindicated.
## Dose Adjustments
No dose adjustment recommendations are typically made based on renal or hepatic impairment for this short-term, acute use medication. However, caution is advised in patients with pre-existing renal impairment due to the risk of electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon
* Heart failure
* Gastric retention
* Intestinal obstruction or perforation
* Young children (under 2 years)
* Patients with impaired renal function (caution advised)
* Patients with ileostomy or colostomy
* Anuria
* Concurrent use of other sodium-raising medications.
## Adverse Effects
Common: Abdominal pain, nausea, vomiting, bloating, cramping, diarrhea.
Serious: Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, dehydration, renal failure, cardiac arrhythmias, CNS depression, seizures, anaphylaxis.
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte imbalances (hypokalemia, hypernatremia).
* **ACE inhibitors and ARBs:** Increased risk of hyperkalemia.
* **Lithium:** Decreased lithium absorption.
* **Medications requiring specific GI transit time:** May alter absorption or efficacy.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalances (e.g., thirst, dry mouth, dizziness, muscle cramps, confusion, fatigue, changes in urination).
* Monitor renal function and electrolytes in patients with risk factors (e.g., renal impairment, elderly, concurrent use of nephrotoxic drugs).
## Clinical Pearls
* Ensure adequate hydration before and after administration.
* Patient should remain near a toilet after administration.
* Do not use if rectal bleeding is present or if bowel movements have not occurred after using a laxative.
* Cases of severe hyperphosphatemia, hypocalcemia, and renal failure have been reported, particularly in children and elderly patients, and those with renal impairment or concurrent use of other sodium-raising agents.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the official prescribing information and relevant guidelines for complete and up-to-date details before making clinical decisions.
