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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a saline laxative for the relief of occasional constipation. It works by drawing water into the bowel, softening stool and stimulating bowel movements.
## Primary Indications
* Relief of occasional constipation.
* Bowel preparation prior to endoscopic or radiologic procedures.
## Adult Dosing
**Constipation:** Typically, one 4.5 fl oz (133 mL) enema administered rectally as a single dose.
**Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) enema administered rectally, to be administered 2-5 hours before the scheduled procedure. Specific timing and adjuncts may vary per institutional protocol.
## Pediatric Dosing
**Constipation:**
* **6-11 years:** One 2.25 fl oz (66.5 mL) enema administered rectally as a single dose.
* **Under 6 years:** Not recommended. Safety and efficacy have not been established. Use with extreme caution and under close medical supervision if indicated.
## Dose Adjustments
No dose adjustments are typically needed for renal or hepatic impairment, however, caution is advised in patients with impaired kidney function due to the risk of hyperphosphatemia and hypocalcemia.
## Contraindications
* Congenital or acquired megacolon.
* Bowel obstruction or perforation.
* Gastric retention.
* Abdominal pain of unknown etiology.
* Acute appendicitis.
* Severe renal impairment.
* Heart failure, severe renal disease, or conditions where increased sodium absorption may be detrimental.
* Patients with hyperphosphatemia or hypocalcemia.
* Children under 6 years of age.
## Adverse Effects
* **Common:** Abdominal discomfort, nausea, vomiting, rectal irritation, cramping.
* **Serious:** Electrolyte imbalances (hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia), dehydration, renal failure, seizures, cardiac arrhythmias, gastrointestinal perforation.
## Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalances.
* **Drugs affecting electrolyte balance:** Concurrent use with other medications that can cause electrolyte disturbances should be approached with caution.
* **Calcium-containing medications:** May increase the risk of hyperphosphatemia.
## Monitoring
* Monitor for signs of dehydration (thirst, dry mouth, decreased urine output).
* Monitor for signs of electrolyte imbalance (muscle cramps, weakness, confusion, irregular heartbeat).
* In patients with risk factors for renal impairment, monitor renal function and electrolytes.
## Clinical Pearls
* Advise patients to retain the enema for the recommended duration (typically 5-15 minutes) for optimal effect.
* Instruct patients to discontinue use and seek medical attention if they experience severe abdominal pain, rectal bleeding, or no bowel movement after use.
* Due to the risk of severe electrolyte abnormalities and dehydration, particularly in children and elderly patients, sodium phosphate enemas should be used judiciously and avoided in patients with contraindications.
* Ensure adequate hydration before and after administration.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before administering this medication.
