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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel cleansing.
### Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy) or surgery.
* Treatment of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically, a single dose of 4.5 ounces (133 mL) is administered. Follow specific institutional protocols; some may recommend a second dose.
* **Constipation:** 2.25 to 4.5 ounces (67 to 133 mL) administered as a single dose.
### Pediatric Dosing
* **Ages 2-12 years:** 2.25 ounces (67 mL) as a single dose.
* **Under 2 years:** Use is generally not recommended due to increased risk of serious adverse events. Consult with a pediatrician.
### Dose Adjustments
No dose adjustments are typically required for renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
### Contraindications
* Congenital megacolon.
* Heart failure.
* Anuria, oliguria, or significant renal impairment.
* Children under 2 years of age.
* Patients with pre-existing electrolyte imbalances (e.g., hyperphosphatemia, hypocalcemia).
* Patients with bowel obstruction or perforation.
* Patients with active inflammatory bowel disease.
### Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hyponatremia, metabolic acidosis. This is a significant concern, especially in pediatric patients, those with renal impairment, or those receiving multiple doses.
* Renal impairment or acute kidney injury.
* Cardiac arrhythmias.
* Seizures.
* Dehydration.
### Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalance.
* **ACE inhibitors and ARBs:** Increased risk of hyperkalemia.
* **Calcium channel blockers:** Potential for altered calcium levels impacting cardiac function.
* **Lithium:** Risk of altered lithium levels due to changes in fluid and electrolyte balance.
### Monitoring
* Monitor for signs and symptoms of electrolyte imbalance (e.g., muscle cramps, paresthesias, confusion, cardiac abnormalities).
* Assess for signs of dehydration.
* Monitor renal function (serum creatinine) especially in at-risk populations.
### Clinical Pearls
* Administer slowly and ensure the patient retains the enema.
* Advise patients to drink plenty of clear fluids before and after use to prevent dehydration.
* Avoid use in elderly, debilitated, or very young patients, and those with impaired renal function, due to the risk of severe electrolyte disturbances.
* Multiple doses or rapid administration increase the risk of adverse events.
* If bowel preparation is required for a procedure, ensure the patient understands the timing and instructions.
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*Disclaimer: This information is intended for healthcare professionals. Always verify the most current prescribing information and local protocols before administering any medication.*
