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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a stimulant laxative for bowel evacuation.
## Primary Indications
Bowel preparation prior to colonoscopy or surgery. Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) bottle administered as a single dose, usually the evening before or morning of the procedure. Follow specific institutional protocols.
* **Constipation:** One 4.5 oz (133 mL) bottle administered as a single dose.
## Pediatric Dosing
* **Under 2 years:** Contraindicated.
* **2-5 years:** 2.5 oz (75 mL) rectally, as a single dose. Monitor closely for dehydration and electrolyte imbalance.
* **6-11 years:** 5 oz (150 mL) rectally, as a single dose.
* **12 years and older:** Adult dose.
Dosing in pediatrics should be carefully considered due to the risk of electrolyte disturbances. Consult pediatric guidelines or specialists for specific situations.
## Dose Adjustments
No specific dose adjustments are routinely recommended for hepatic or renal impairment, but caution is advised due to the risk of hyperphosphatemia and hypocalcemia, especially in patients with pre-existing renal dysfunction.
## Contraindications
* Congestive heart failure
* Acute renal failure
* Pre-existing hypocalcemia
* Intestinal obstruction
* Gastrointestinal perforation
* Children under 2 years of age
* Patients with ileostomy or colostomy (risk of significant fluid and electrolyte loss)
* Patients with megacolon or reduced bowel motility
## Adverse Effects
* Nausea, vomiting, abdominal cramping, bloating
* Electrolyte disturbances: Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia. Severe cases can lead to cardiac arrhythmias, tetany, seizures, and renal failure.
* Rectal irritation or burning
* Dehydration
## Key Drug Interactions
* **Diuretics (e.g., thiazides, loop diuretics):** Increased risk of electrolyte imbalances.
* **Drugs affecting renal function (e.g., NSAIDs, ACE inhibitors, ARBs):** Increased risk of renal toxicity and electrolyte disturbances.
* **Calcium supplements:** May exacerbate hyperphosphatemia.
## Monitoring
* Electrolytes (phosphate, calcium, sodium, potassium)
* Renal function (BUN, creatinine)
* Signs of dehydration
## Clinical Pearls
* Ensure adequate hydration before and after administration.
* Advise patients to remain near a toilet after administration.
* Use with extreme caution in elderly patients, patients with renal impairment, and those with cardiac conditions due to the risk of severe electrolyte and fluid shifts.
* The risk of serious toxicity is higher in children than adults.
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*Disclaimer: This information is intended for clinical use and is not a substitute for professional medical advice. Always verify current prescribing information and consult with a qualified healthcare provider.*
