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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic solution that draws water into the colon, producing a bowel movement through osmotic action.
### Primary Indications
* Bowel preparation for colonoscopy or surgery.
* Relief of occasional constipation.
### Adult Dosing
* **Constipation:** Typically, one 4.5 oz (133 mL) bottle administered rectally as a single dose.
* **Bowel Preparation:** One 4.5 oz (133 mL) bottle administered rectally, usually the evening before the procedure, or as per specific protocol (may involve a second dose).
### Pediatric Dosing
* **Children 2-11 years:** One-half the adult dose (approximately 2.25 oz or 66.5 mL) administered rectally.
* **Children < 2 years:** Generally not recommended. Safety and efficacy are not established, and there is a higher risk of severe electrolyte imbalance.
### Dose Adjustments
* No dose adjustments are typically required based on renal or hepatic impairment, but caution is advised due to the risk of electrolyte abnormalities.
### Contraindications
* Congestive heart failure.
* Acute renal failure.
* Intestinal obstruction or perforation.
* Congenital megacolon.
* Children under 2 years of age.
* Patients with ileostomy or colostomy.
* Hypersensitivity to sodium phosphate.
* Patients with conditions that increase risk of electrolyte imbalance (e.g., anorexia, nausea, vomiting, dehydration).
### Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, renal failure, cardiac arrhythmias, seizures. Risk is increased with overuse, rapid administration, or in susceptible populations.
### Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia and renal impairment.
* **Calcium-containing medications:** Potential for calcium-phosphate product formation.
### Monitoring
* Electrolytes (phosphate, calcium, sodium) especially in children, elderly, or patients with renal impairment.
* Renal function (creatinine) if risk factors are present.
* Signs of dehydration.
### Clinical Pearls
* Do not use more than one 4.5 oz bottle in 24 hours, or two bottles within the prescribed bowel preparation regimen.
* Patient education is critical regarding administration, potential side effects, and contraindications.
* Ensure adequate hydration before and after administration.
* Use with caution in elderly patients and those with known renal disease.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making treatment decisions.*
