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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline laxative that works by drawing water into the colon, softening stool and stimulating bowel evacuation.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, barium enema).
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema is administered rectally as directed by the prescribing physician, usually within 3-5 hours before the procedure.
* **Constipation:** One 2.25 oz (66 mL) enema administered rectally. May repeat after 24 hours if needed.
## Pediatric Dosing
* **Ages 2-11 years:** One 1.125 oz (33 mL) enema. Do not exceed one dose in 24 hours.
* **Under 2 years:** Contraindicated.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment. However, caution is advised in patients with pre-existing renal or cardiac conditions due to the potential for electrolyte shifts.
## Contraindications
* Congenital megacolon
* Heart failure
* Intestinal obstruction
* Perforated bowel
* Severe renal impairment (CrCl < 30 mL/min)
* Young children (< 2 years of age)
* Patients with impaired water absorption or elimination
* Patients on medications known to affect electrolyte balance (e.g., diuretics, ACE inhibitors)
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, electrolyte imbalance, renal damage, cardiac arrhythmias.
## Key Drug Interactions
* Diuretics: Increased risk of dehydration and electrolyte imbalance.
* ACE inhibitors, Angiotensin receptor blockers (ARBs), Potassium-sparing diuretics: Increased risk of hyperkalemia.
* Lithium: May decrease lithium excretion.
## Monitoring
* Electrolytes (sodium, phosphate, calcium, potassium)
* Renal function (BUN, creatinine)
* Signs and symptoms of dehydration or electrolyte imbalance (dizziness, weakness, confusion, irregular heartbeat)
## Clinical Pearls
* Ensure adequate hydration before and after administration.
* Administer slowly and retain for the recommended duration to maximize effectiveness and minimize irritation.
* Avoid use in patients at risk for electrolyte disturbances or renal impairment.
* This product should not be used for chronic constipation due to the risk of electrolyte imbalance and dependence.
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**Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and institutional protocols for complete details and to ensure patient safety.
