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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used for bowel cleansing.
### Primary Indications
* Bowel preparation for diagnostic procedures or surgery.
* Relief of occasional constipation.
### Adult Dosing
* **Constipation:** Typically one 4.5 oz (133 mL) enema administered rectally.
* **Bowel Preparation:** One 4.5 oz (133 mL) enema administered rectally, usually followed by a second dose 5-10 minutes later, or as per specific protocol. Total dose should not exceed 9 oz (266 mL) in 24 hours.
### Pediatric Dosing
* **Children 2-11 years:** One 2.25 oz (66 mL) enema administered rectally.
* **Children < 2 years:** Not recommended due to increased risk of severe electrolyte disturbances and dehydration.
### Dose Adjustments
No specific dose adjustments are typically required based on renal or hepatic impairment, but caution is advised in patients with these conditions due to potential for altered fluid and electrolyte balance.
### Contraindications
* Congenital megacolon.
* Heart failure.
* Hyperphosphatemia.
* Hypernatremia.
* Hypertension.
* Intestinal obstruction or perforation.
* Renal impairment.
* Severe dehydration.
* Young children (< 2 years).
* Patients on medications that may affect renal function (e.g., ACE inhibitors, ARBs, diuretics, NSAIDs).
### Adverse Effects
Common: Abdominal discomfort, nausea, vomiting, bloating, rectal irritation.
Serious: Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, renal failure, seizures.
### Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia, hyponatremia, and acute kidney injury.
* **Calcium-containing products:** May increase the risk of calcium phosphate deposition in renal tubules.
### Monitoring
* Monitor for signs and symptoms of dehydration (thirst, dry mouth, decreased urine output, dizziness).
* Monitor for signs and symptoms of electrolyte imbalances (weakness, cramps, confusion, arrhythmias).
* Consider baseline and post-enema electrolytes (sodium, phosphate, calcium) in patients at high risk for imbalances, especially in pediatric patients or those with renal impairment.
### Clinical Pearls
* Instruct patients to retain the enema for 5-10 minutes or as long as possible to allow for adequate bowel cleansing.
* Do not administer if rectal irritation or bleeding is present.
* Use with caution in elderly patients and those with pre-existing renal or cardiac conditions.
* This product can cause serious electrolyte disturbances and dehydration, especially if used improperly or in contra-indicated patients. Adhere strictly to dosing recommendations.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information or a pharmacist for complete drug details and to verify dosing and safety in a specific patient.*
