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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 diagnostic procedures or surgical procedures, and for the short-term treatment of occasional constipation.
## Primary Indications
* Bowel preparation for colonoscopy or surgery.
* Short-term treatment of constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema administered once, 3-12 hours before the procedure. A second dose may be administered if recommended by the healthcare provider or protocol.
* **Constipation:** One 2.25 oz (66 mL) enema administered once every 24 hours as needed.
## Pediatric Dosing
* **Bowel Preparation:**
* Age 2 to under 6 years: 1.125 oz (33 mL) enema once, 3-12 hours before procedure.
* Age 6 to under 12 years: 2.25 oz (66 mL) enema once, 3-12 hours before procedure.
* **Constipation:**
* Age 2 to under 6 years: 1.125 oz (33 mL) enema once every 24 hours as needed.
* Age 6 to under 12 years: 2.25 oz (66 mL) enema once every 24 hours as needed.
* **Children under 2 years:** Use is not recommended due to increased risk of electrolyte disturbances. Consult a pediatrician for alternative treatments.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment, however, caution is advised due to the risk of electrolyte imbalances.
## Contraindications
* Congenital or acquired megacolon.
* Anuria, oliguria, or significant renal impairment.
* Congestive heart failure.
* Ascites.
* Intestinal obstruction or perforation.
* Marked constipation with delayed transit time.
* Children under 2 years of age.
* Patients on medications that affect electrolyte balance (e.g., diuretics, ACE inhibitors).
* Known hypersensitivity to sodium phosphate.
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, renal damage (including acute kidney injury and nephrocalcinosis), seizures, cardiac arrhythmias, and even death, particularly in patients with contraindications or in children.
## Key Drug Interactions
* **Diuretics, ACE Inhibitors, ARBs:** Increased risk of hyperphosphatemia and hypocalcemia.
* **Medications affecting renal function:** Increased risk of renal toxicity.
## Monitoring
* Electrolyte levels (phosphate, calcium, sodium, potassium), especially in patients with risk factors or in children.
* Renal function (BUN, creatinine).
* Signs and symptoms of dehydration.
## Clinical Pearls
* Administer the enema slowly and as high into the rectum as possible.
* Retain the enema for the prescribed duration (usually 5-15 minutes) to ensure effectiveness.
* Avoid if bowel obstruction is suspected.
* Ensure adequate hydration before and after administration.
* Due to serious risks, particularly in children and those with renal impairment, alternative bowel preparation methods are often preferred.
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*Disclaimer: This information is intended for healthcare professionals and does not replace current prescribing information. Always consult the official product labeling and institutional protocols for definitive guidance.*
