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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-ounce (133 mL) enema administered 2-5 hours prior to the procedure. Do not administer more than one dose in 24 hours.
* **Constipation:** One 4.5-ounce (133 mL) enema as a single dose. Do not administer more than one dose in 24 hours.
## Pediatric Dosing
* **Ages 2-11 years:** Half the adult dose (approximately 2.25 ounces or 66.5 mL).
* **Under 2 years:** Generally not recommended. Use with extreme caution and under strict medical supervision, if at all. Specific dosing is not established and depends on clinical judgment and local protocol.
## Dose Adjustments
No dose adjustments are typically needed based on renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Gastrointestinal obstruction or perforation.
* Severe renal impairment.
* Congestive heart failure.
* Patients with ileostomy or colostomy (unless specifically directed by a physician).
* Patients with anorexia, nausea, vomiting, or abdominal pain of unknown origin.
* Children under 2 years of age (relative contraindication).
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, anal irritation.
* **Serious:**
* **Electrolyte Imbalances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, metabolic acidosis. These can lead to seizures, cardiac arrhythmias, tetany, renal failure, and even death, particularly in children, the elderly, and those with renal impairment.
* **Dehydration.**
* **Rectal irritation or bleeding.**
* **Rare:** Allergic reactions.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperkalemia and renal dysfunction.
* **Calcium-containing medications:** May increase risk of hyperphosphatemia and hypocalcemia.
* **Drugs affecting kidney function:** Increased risk of renal toxicity and electrolyte disturbances.
## Monitoring
* **Electrolytes:** Particularly important in pediatric patients, elderly patients, those with renal impairment, or if multiple doses are administered. Monitor for signs and symptoms of electrolyte imbalance (e.g., muscle twitching, irregular heartbeat, confusion, seizures).
* **Renal function:** Especially in patients with pre-existing renal disease.
* **Hydration status.**
## Clinical Pearls
* Sodium phosphate enemas are effective but carry a significant risk of severe electrolyte disturbances and dehydration.
* Use with caution and only as directed by a healthcare professional.
* Ensure adequate hydration before and after administration.
* The risk of adverse events is higher in pediatric patients, the elderly, and those with impaired renal function.
* Alternative bowel preparation agents may be preferred in high-risk populations.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and relevant literature before making clinical decisions. Dosing and recommendations may vary based on individual patient factors and institutional protocols.*
