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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline laxative that works by drawing water into the colon, which softens stool and stimulates bowel movement.
## Primary Indications
* Bowel preparation prior to colonoscopy or other colonic procedures.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically a single 4.5 oz (133 mL) enema administered rectally. The dose may be repeated if bowel cleansing is inadequate, but this should be guided by specific protocol.
* **Constipation:** 2.25 oz (66 mL) to 4.5 oz (133 mL) administered rectally as a single dose.
## Pediatric Dosing
* **Children 2-12 years:** 2.25 oz (66 mL) enema administered rectally as a single dose.
* **Children under 2 years:** Use is generally not recommended due to increased risk of electrolyte imbalance and dehydration. Consult with a pediatrician.
## Dose Adjustments
No dose adjustments are typically required for renal or hepatic impairment, but caution is advised due to potential for electrolyte disturbances.
## Contraindications
* Congestive heart failure.
* Gastrointestinal obstruction.
* Appendicitis.
* Intestinal perforation.
* Severe renal impairment.
* Hyperphosphatemia.
* Hypocalcemia.
* Children under 2 years of age.
* Patients with a colostomy or ileostomy.
* Patients with megacolon or any condition that may lead to anal sphincter incompetence.
## Adverse Effects
* Nausea, vomiting, abdominal cramping, bloating.
* Electrolyte disturbances (hyperphosphatemia, hypocalcemia, hypernatremia, hyponatremia, hypokalemia) leading to cardiac arrhythmias, seizures, renal failure.
* Rectal irritation, anal discomfort.
* Dehydration.
## Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalances.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia.
* **Calcium channel blockers:** Increased risk of hyperkalemia.
* **Lithium:** Increased risk of lithium toxicity due to altered absorption.
## Monitoring
* Electrolytes (especially phosphate, calcium, sodium, potassium) in patients with risk factors for imbalance, renal impairment, or frequent use.
* Renal function.
* Signs of dehydration.
## Clinical Pearls
* Ensure patient is well-hydrated before and after administration.
* Advise patients to retain the enema for the recommended time (usually 5 minutes or as long as possible) for optimal efficacy.
* Do not use for prolonged periods or more frequently than recommended due to risk of electrolyte disturbances.
* Risk of severe hyperphosphatemia and hypocalcemia, particularly in children and those with renal impairment.
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*Disclaimer: This information is for educational purposes only and does not substitute for professional medical advice. Always consult the most current prescribing information and a healthcare professional for any medication-related questions or before making any decisions related to patient care.*
