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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline laxative used for bowel evacuation. It works by drawing water into the colon, which softens stool and stimulates bowel movement.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., sigmoidoscopy, colonoscopy) or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema is administered as a single dose, usually within 2-5 hours before the procedure or as directed by the physician. The maximum frequency is one dose in 24 hours.
* **Constipation:** One 4.5 oz (133 mL) enema as a single dose.
## Pediatric Dosing
* **Children 2 to under 12 years:** One-half of the adult dose (approximately 2.25 oz or 66.5 mL) may be administered.
* **Children under 2 years:** Not recommended due to the risk of serious adverse events, including hypernatremia, dehydration, and cardiac arrest. Use with extreme caution and under strict medical supervision only if absolutely necessary, and only with a reduced dose as determined by a healthcare provider.
## Dose Adjustments
* No specific dose adjustments are typically required for renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
## Contraindications
* Congestive heart failure
* Hypernatremia
* Renal impairment (severe)
* Intestinal obstruction or perforation
* Congenital or acquired megacolon
* Anuria
* Children under 2 years of age
* Patients with ileostomy or colostomy
* Concurrent use of other sodium phosphate products.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, diarrhea.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hyponatremia, hypokalemia. This is a significant concern, especially in patients with renal impairment, children, or with frequent/excessive use.
* **Renal injury:** Acute kidney injury can occur, particularly in patients with pre-existing renal disease.
* **Cardiac effects:** Arrhythmias, QT prolongation, and cardiac arrest have been reported, often secondary to electrolyte imbalances.
* **Dehydration.**
* **Rectal irritation or bleeding.**
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte depletion and dehydration.
* **ACE inhibitors and ARBs:** May increase the risk of hyperkalemia.
* **Drugs affecting renal function:** Concurrent use with NSAIDs or other nephrotoxic agents may increase the risk of renal injury.
* **Calcium channel blockers:** May increase the risk of hyperkalemia.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalances (e.g., thirst, dry mouth, decreased urine output, muscle cramps, weakness, dizziness, confusion, irregular heartbeat).
* Electrolyte levels (sodium, potassium, phosphate, calcium) and renal function (creatinine, BUN) should be monitored, particularly in at-risk populations.
## Clinical Pearls
* Instruct patients to consume clear liquids before and after administration to prevent dehydration.
* Do not use if patient has nausea, vomiting, abdominal pain, or other signs of appendicitis, intestinal obstruction, or undiagnosed abdominal pain.
* This product should be used with extreme caution in the elderly, very young, and patients with impaired renal function, heart failure, or other conditions that increase the risk of electrolyte imbalances.
* Limit use to a single dose within a 24-hour period.
* Avoid concurrent use of other sodium phosphate preparations.
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*This information is intended for healthcare professionals. Always consult the official prescribing information and your institution's guidelines for the most current and complete drug information.*
