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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a saline laxative used for bowel cleansing prior to colonoscopy, surgery, or radiographic examination. It acts by drawing water into the colon, which softens stool and stimulates bowel movement.
## Primary Indications
* Bowel evacuation for constipation.
* Pre-procedure bowel preparation.
## Adult Dosing
* **Constipation:** 1 enema (typically 4.5 oz or 118 mL) administered rectally.
* **Bowel Preparation:** 1 enema (typically 4.5 oz or 118 mL) administered rectally, usually the evening before or morning of the procedure. Follow specific institutional or procedural guidelines. Some protocols may involve a second dose.
## Pediatric Dosing
* **Children 2 to under 6 years:** 1/4 to 1/2 of the adult dose (2 to 4 oz or 59 to 118 mL), administered rectally. **Caution is advised due to increased risk of electrolyte imbalance.**
* **Children under 2 years:** Generally not recommended due to a higher risk of toxicity. Use with extreme caution and under strict medical supervision if deemed necessary.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment, but caution is warranted due to the risk of electrolyte disturbances. Avoid in patients with existing electrolyte imbalances or renal dysfunction.
## Contraindications
* Congestive heart failure.
* Recent myocardial infarction.
* Ascites.
* Ileus.
* Bowel obstruction.
* Congenital or acquired megacolon.
* Severe renal impairment.
* Hyperphosphatemia.
* Hypocalcemia.
* Concurrent use of other sodium phosphate preparations.
* Patients unable to retain the enema.
* Children under 2 years of age, except under strict medical supervision.
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia. Symptoms can include tetany, muscle cramps, paresthesias, cardiac arrhythmias, seizures.
* **Renal injury:** Acute kidney injury, especially in patients with pre-existing renal disease or dehydration.
* **Dehydration.**
* **Rectal perforation or ulceration** (rare, more common with overuse or in susceptible patients).
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte imbalances.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia and renal dysfunction.
* **NSAIDs:** Increased risk of renal dysfunction.
* **Other laxatives:** Can potentiate fluid and electrolyte loss.
## Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., nausea, vomiting, dizziness, muscle weakness, paresthesias, confusion, cardiac arrhythmias).
* Consider baseline and post-administration electrolytes and renal function in patients at risk (elderly, renal impairment, cardiac disease).
## Clinical Pearls
* Ensure adequate hydration before and after administration.
* Administer slowly and as low as possible into the rectum to minimize cramping and promote retention.
* The risk of serious adverse events, particularly electrolyte abnormalities and renal injury, is higher in children, the elderly, and patients with renal insufficiency or cardiac disease.
* Advise patients to contact their healthcare provider if they experience severe cramping, vomiting, or signs of dehydration or electrolyte imbalance.
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*This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult current prescribing information and institutional protocols for complete details.*
