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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel evacuation.
## Primary Indications
Bowel preparation for colonoscopy or surgery, treatment of constipation.
## Adult Dosing
* **Constipation:** Typically, one 4.5 fl oz (133 mL) enema administered rectally.
* **Bowel Preparation:** One 4.5 fl oz (133 mL) enema administered rectally, usually administered once or twice as per specific protocol (e.g., evening before and morning of procedure).
## Pediatric Dosing
* **Children 2-11 years:** 2.5 fl oz (75 mL) administered rectally.
* **Children < 2 years:** Not recommended due to increased risk of toxicity. Use is generally limited to specific medical indications under close supervision.
## Dose Adjustments
No specific dose adjustments for hepatic or renal impairment are established for enema use, however, caution is advised in patients with renal impairment due to potential for electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Appendicitis symptoms (nausea, vomiting, abdominal pain).
* Anuria.
* Congestive heart failure.
* Known or suspected Hirschsprung disease.
* Hyperphosphatemia, hypocalcemia, hypernatremia, or hyponatremia.
* Patients with inadequate fluid intake or other conditions predisposing to dehydration.
* Use in children under 2 years of age.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia (can lead to tetany), hypernatremia, hyponatremia, dehydration. These are particularly concerning in children, the elderly, and patients with renal impairment.
* **Renal injury:** Acute kidney injury, especially with repeated use or in susceptible individuals.
* **Cardiac arrhythmias:** Secondary to electrolyte imbalances.
* **Hypersensitivity reactions.**
## Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalances.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia and renal impairment.
* **Other sodium-containing medications:** Potential for additive sodium load.
## Monitoring
* Monitor for signs of dehydration (thirst, dry mouth, decreased urine output).
* Monitor for symptoms of electrolyte imbalance (muscle cramps, weakness, dizziness, confusion, irregular heartbeat).
* Electrolyte levels (phosphate, calcium, sodium, potassium) may be monitored, especially in at-risk populations or with repeated use.
* Renal function (serum creatinine) may be monitored in at-risk populations.
## Clinical Pearls
* Administer slowly and only as directed. Retention is crucial for efficacy.
* Instruct patients to retain the enema for the recommended time (usually 2-5 minutes, or as long as possible) to allow for fluid absorption and bowel evacuation.
* Do not use if abdominal pain, nausea, or vomiting are present unless directed by a physician.
* Avoid repeated or excessive use due to the risk of severe electrolyte disturbances and renal injury.
* Pre-mixed solutions (e.g., Fleet Enema) are typically 16% sodium phosphate and 13.8% sodium biphosphate. Concentrations can vary; always check product labeling.
* Oral sodium phosphate preparations carry a higher risk of severe renal injury and are generally discouraged for bowel preparation.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the current prescribing information and relevant clinical guidelines for complete details. Dosing and recommendations may vary based on patient-specific factors and institutional protocols.
