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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a stimulant laxative for bowel evacuation.
## Primary Indications
Bowel preparation before colonoscopy, barium enema, or other intestinal procedures. Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) bottle administered rectally as a single dose. May be repeated in 24 hours if necessary, but caution is advised due to risk of electrolyte imbalance.
* **Constipation:** One 2.25 oz (66 mL) bottle administered rectally as a single dose.
## Pediatric Dosing
* **Children 2 to <12 years:** Use with caution. One 2.25 oz (66 mL) bottle administered rectally as a single dose.
* **Children <2 years:** Not recommended due to increased risk of serious adverse events, including hypernatremia, dehydration, and cardiac arrest.
## Dose Adjustments
* No specific dose adjustments are typically required for renal or hepatic impairment, but use with extreme caution and consider alternative agents in patients with compromised kidney function or those on sodium-restricted diets.
## Contraindications
* Congenital megacolon.
* Congestive heart failure.
* Children less than 2 years of age.
* Patients with ileus, bowel obstruction, or anal atresia.
* Patients with severe renal impairment (CrCl <30 mL/min).
* Patients with significant vomiting or nausea.
* Patients with anuria.
* Patients with newly diagnosed or existing inflammatory bowel disease (e.g., Crohn's disease, ulcerative colitis), or other conditions predisposing to toxic megacolon.
* Patients with a history of rectal surgery or significant rectal disease.
## Adverse Effects
The most significant adverse effects are related to fluid and electrolyte disturbances, including hypernatremia, hypocalcemia, hyperphosphatemia, hypokalemia, and metabolic acidosis. Dehydration, abdominal cramping, nausea, vomiting, rectal irritation, and anal irritation can also occur. Serious cases can lead to arrhythmias, seizures, kidney injury, and death.
## Key Drug Interactions
* **Diuretics, ACE Inhibitors, ARBs:** Increased risk of hyperkalemia and acute kidney injury.
* **Calcium-containing medications:** Increased risk of hyperphosphatemia and hypocalcemia.
* **Drugs affecting gastrointestinal motility:** May alter absorption or efficacy of other medications.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, dry mouth, decreased urine output, dizziness, muscle weakness, confusion, arrhythmias).
* Consider serum electrolytes and renal function, especially in pediatric patients, the elderly, and those with underlying medical conditions or at risk for fluid/electrolyte disturbances.
## Clinical Pearls
* Use with caution in elderly patients, patients with impaired renal function, and those on sodium-restricted diets.
* Ensure adequate fluid intake before and after administration.
* Do not administer to patients experiencing nausea, vomiting, or abdominal pain without a clear diagnosis.
* Educate patients on proper administration technique and potential side effects.
* For bowel preparation, it is crucial to follow specific pre-procedure instructions from the healthcare provider regarding diet and fluid intake.
Please verify current prescribing information for the most up-to-date details.
