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# Sodium Phosphate Enema
## Overview
Sodium phosphate enemas are hypertonic saline solutions that act as osmotic laxatives by drawing water into the colon, softening stool and stimulating bowel evacuation.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy) or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5-ounce (133 mL) bottle administered as a single dose. The dose may be repeated if necessary, but the total daily dose should not exceed one bottle (133 mL). Some protocols may recommend administering half the dose the evening before and the other half on the morning of the procedure. **Consult local protocol.**
* **Constipation:** One 2.25-ounce (66 mL) bottle administered as a single dose.
## Pediatric Dosing
* **Ages 5-11 years:** 2.25 ounces (66 mL) administered as a single dose.
* **Under 5 years:** Safety and efficacy not established. Use with extreme caution and only under strict medical supervision. **Consult local protocol.**
## Dose Adjustments
No specific dose adjustments for renal or hepatic impairment are commonly recommended due to the limited systemic absorption with enema administration. However, patients with impaired renal function are at increased risk of hyperphosphatemia and hypocalcemia.
## Contraindications
* Congestive heart failure
* Anuria
* Renal insufficiency
* Myocardial damage
* Megacolon
* Intestinal obstruction
* Congenital or acquired megacolon
* Bowel perforation
* Acute hepatitis
* Ileus
* Children under 2 years of age (due to increased risk of toxicity)
* Patients with conditions that increase the risk of electrolyte imbalance or fluid retention (e.g., Hirschsprung disease, severe abdominal pain, nausea, vomiting, abdominal distention).
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation, diarrhea.
* **Serious:** Severe electrolyte abnormalities (hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia), renal tubular damage, cardiac arrhythmias, dehydration, hypothermia, seizures, coma. The risk is higher in pediatric patients, the elderly, and those with renal impairment.
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte disturbances.
* **ACE inhibitors and ARBs:** May increase the risk of hyperkalemia.
* **Lithium:** May alter lithium levels due to altered renal excretion.
* **Drugs affecting renal function:** Concurrent use may increase the risk of renal toxicity.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalances (e.g., thirst, dry mouth, decreased urine output, dizziness, muscle weakness or cramps, confusion, irregular heartbeat).
* Electrolyte levels (phosphate, calcium, sodium, potassium) should be monitored, especially in at-risk populations (pediatrics, elderly, renal impairment).
* Renal function should be assessed in at-risk individuals.
## Clinical Pearls
* Administer slowly and ensure the patient retains the fluid for the recommended time (typically 5-15 minutes).
* Avoid use in children under 2 years of age due to significant risks.
* Counsel patients on the potential for severe electrolyte imbalances and the importance of hydration.
* Consider alternative bowel preparation agents for patients with contraindications or risk factors for electrolyte disturbances.
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***Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and relevant literature for complete and up-to-date guidance before making clinical decisions.*
