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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a stimulant laxative for bowel preparation before diagnostic procedures or surgery, and for the treatment of occasional constipation.
## Primary Indications
* Bowel preparation for colonoscopy or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema is administered. For obese patients or those with severe constipation, a second dose may be administered within 24 hours. Follow specific institutional protocols.
* **Constipation:** One 2.25 oz (66 mL) enema.
## Pediatric Dosing
* **Ages 2-11 years:** One 2.25 oz (66 mL) enema.
* **Under 2 years:** Contraindicated due to risk of severe dehydration and electrolyte disturbances.
## Dose Adjustments
No dose adjustments are typically needed for renal or hepatic impairment, but caution is advised. Use with extreme caution in patients with compromised renal function, cardiac failure, or other conditions where fluid retention is a concern.
## Contraindications
* Congenital megacolon.
* Intestinal obstruction or perforation.
* Severe renal impairment (CrCl < 30 mL/min).
* Congestive heart failure.
* Acute liver failure.
* Children under 2 years of age.
* Patients with ileostomy or colostomy.
* Patients with nausea, vomiting, abdominal pain, or other symptoms of appendicitis.
## Adverse Effects
**Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
**Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, electrolyte imbalances, cardiac arrhythmias, renal failure, mucosal damage, seizures.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hypernatremia and renal impairment.
* **Calcium-containing medications:** May increase the risk of hyperphosphatemia and nephrocalcinosis.
* **Other laxatives:** May potentiate electrolyte disturbances.
## Monitoring
* Monitor for signs of dehydration and electrolyte imbalance (e.g., thirst, dry mouth, decreased urine output, fatigue, confusion, arrhythmias).
* Electrolyte levels (phosphate, calcium, sodium, potassium) may be monitored in patients at high risk for disturbances, especially with repeated use or in patients with underlying renal or cardiac disease.
* Renal function (BUN, creatinine) may be monitored.
## Clinical Pearls
* Administer slowly to minimize cramping and discomfort.
* Instruct patients to retain the enema for 5-10 minutes or as long as possible.
* Ensure adequate hydration before and after administration, especially in pediatric patients and the elderly.
* Avoid use in patients with any condition that could impede rectal passage or increase absorption.
* Repeated or prolonged use can lead to electrolyte imbalances and dependence.
* Consider alternatives for patients with contraindications or significant risk factors.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before administering any medication.*
