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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a stimulant laxative for bowel preparation and relief of occasional constipation.
### Primary Indications
* Bowel preparation prior to colonoscopy or surgery.
* Relief of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically, a single 4.5 oz (133 mL) enema is administered. The timing relative to the procedure is often guided by specific protocols.
* **Constipation:** A single 4.5 oz (133 mL) enema may be administered as needed. A second dose may be given if the first is ineffective, but not within 24 hours. Maximum of one dose per day.
### Pediatric Dosing
* **Ages 2-11 years:** 2.3 oz (67.5 mL) enema.
* **Under 2 years:** Not recommended due to risk of electrolyte imbalance and dehydration.
### Dose Adjustments
No dose adjustments are typically needed for renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
### Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Anuresis.
* Congestive heart failure.
* Acute liver failure.
* Use with other phosphate-containing medications.
* Children under 2 years of age.
* Patients with impaired renal function.
* Patients with existing electrolyte abnormalities (e.g., hyperphosphatemia, hypocalcemia).
### Adverse Effects
* Nausea, vomiting, abdominal cramping, bloating.
* Electrolyte disturbances (hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia), which can be severe and life-threatening, especially in patients with renal impairment or those who receive multiple doses.
* Rectal irritation or pain.
* Dehydration.
* Rarely, seizures, cardiac arrhythmias, renal failure.
### Key Drug Interactions
* Concurrent use with other sodium phosphate preparations may increase the risk of phosphate toxicity.
* Diuretic use may increase the risk of dehydration and electrolyte imbalances.
* Medications affecting electrolyte balance (e.g., ACE inhibitors, ARBs) may exacerbate electrolyte disturbances.
### Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte abnormalities (e.g., muscle weakness, dizziness, confusion, decreased urine output, irregular heartbeat).
* Electrolyte levels (phosphate, calcium, sodium, potassium) may be considered in patients at high risk for disturbances, especially with repeated use or in those with underlying conditions.
### Clinical Pearls
* This product is for rectal administration only.
* Do not administer to patients who cannot retain the enema.
* Ensure adequate hydration before and after administration.
* Use with extreme caution or avoid in elderly patients, patients with heart disease, and those with pre-existing renal or electrolyte abnormalities.
* The risk of serious adverse events is increased with repeated use or in patients with risk factors.
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*Please verify this information with the current prescribing information or other reliable resources before making clinical decisions.*
