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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel cleansing prior to procedures or for constipation.
## Primary Indications
* Bowel preparation for diagnostic or surgical procedures.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5-ounce (133 mL) enema is administered. Some protocols may recommend a second dose 10-12 hours after the first, depending on patient factors and procedure timing.
* **Constipation:** One 4.5-ounce (133 mL) enema administered as a single dose.
## Pediatric Dosing
* **Children 2 to <12 years:** One-half the adult dose (approximately 2.25 ounces or 67 mL).
* **Children <2 years:** Not generally recommended. Use with extreme caution and only under strict medical supervision due to increased risk of electrolyte disturbances. Dosing is not standardized and depends on clinical judgment.
## Dose Adjustments
* No specific dose adjustments are recommended for renal or hepatic impairment, but caution is advised due to the risk of electrolyte imbalance.
## Contraindications
* Congenital or acquired megacolon.
* Anatomical abnormalities of the colon.
* Bowel obstruction or perforation.
* Severe renal impairment (creatinine clearance <30 mL/min).
* Congestive heart failure.
* Hypertension.
* Ascites.
* Patients on medications that affect electrolytes (e.g., diuretics, ACE inhibitors).
* Young children (<2 years).
* Patients with ileostomy or colostomy.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, dehydration, renal damage (including acute kidney injury), cardiac arrhythmias, seizures, coma, death.
## Key Drug Interactions
* Concurrent use with other sodium phosphate preparations can increase the risk of hypernatremia and hyperphosphatemia.
* Diuretics, ACE inhibitors, ARBs, and NSAIDs can increase the risk of electrolyte imbalance and acute kidney injury.
## Monitoring
* Electrolyte levels (sodium, potassium, phosphate, calcium) should be monitored, especially in children, elderly patients, those with renal impairment, or those receiving multiple doses.
* Renal function (BUN, creatinine) should be assessed.
* Hydration status.
## Clinical Pearls
* This medication should not be used for chronic constipation or if a bowel movement has not occurred for more than a week, or if there is rectal bleeding.
* Patients should be instructed to drink plenty of clear fluids before and after administration to help prevent dehydration and electrolyte imbalance.
* Rapid administration can lead to severe cramping.
* The risk of serious adverse events, including renal failure, is significantly increased with inappropriate use (e.g., contraindications, overdose, overuse).
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*This information is intended for healthcare professionals. Always consult the full prescribing information and consider individual patient factors before making clinical decisions.*
