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# Sodium Phosphate Enema
## Overview
Sodium phosphate enemas are hypertonic saline solutions used for bowel cleansing prior to rectal or colon examination, or for relief of occasional constipation.
## Primary Indications
* Bowel preparation for colonoscopy or sigmoidoscopy.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically one 4.5-ounce (133 mL) enema administered once. May repeat after at least 24 hours if incomplete evacuation occurs, but this is generally not recommended due to risk of electrolyte disturbances.
* **Constipation:** One 4.5-ounce (133 mL) enema administered once.
## Pediatric Dosing
* **Children 2 to under 12 years:** One 2.25-ounce (66 mL) enema administered once.
* **Children under 2 years:** Safety and efficacy not established. Use with extreme caution and under close medical supervision due to increased risk of toxicity. Dosing is highly individualized and not standard.
## Dose Adjustments
No dose adjustments are typically needed based on renal or hepatic impairment, but caution is advised due to the risk of electrolyte imbalances.
## Contraindications
* Congenital or acquired megacolon.
* Bowel obstruction or suspected bowel obstruction.
* Gastric retention.
* Ileus.
* Perforated bowel.
* Severe renal impairment (CrCl < 30 mL/min).
* Heart failure, new or worsening.
* Congenital or acquired megacolon.
* Children under 2 years of age (relative contraindication due to increased risk).
* Patients on medications that affect electrolyte balance or hydration status (e.g., diuretics, ACE inhibitors, ARBs).
* Patients with existing electrolyte abnormalities.
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, rectal irritation, bloating.
* **Serious:**
* **Hyperphosphatemia:** Can lead to hypocalcemia, tetany, cardiac arrhythmias, seizures, and death. Risk is higher in children, elderly, and those with renal impairment.
* **Hypocalcemia:** Can manifest as paresthesias, muscle cramps, carpopedal spasm, and cardiac arrhythmias.
* **Hyponatremia:** Can lead to confusion, seizures, and coma.
* **Dehydration.**
* **Renal injury:** Acute kidney injury, particularly in patients with pre-existing renal disease or those who use it excessively.
* **Arrhythmias.**
* **Hypersensitivity reactions.**
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperkalemia and acute kidney injury.
* **Calcium and Vitamin D supplements:** May exacerbate hyperphosphatemia.
* **Magnesium-containing products:** Potential for additive hypermagnesemia if co-administered.
## Monitoring
* Electrolytes (sodium, potassium, phosphate, calcium) before and after use, especially in at-risk populations.
* Renal function (BUN, creatinine).
* Signs and symptoms of dehydration, electrolyte imbalance, or renal toxicity.
## Clinical Pearls
* Ensure patients understand administration instructions to minimize adverse events.
* Administer slowly to reduce cramping.
* Advise patients to remain on a clear liquid diet for 24 hours prior to use to optimize bowel cleansing.
* Due to the risk of severe electrolyte disturbances and renal injury, alternative bowel preparation agents are generally preferred, especially in pediatric patients and those with renal or cardiac comorbidities.
* This product should not be used for the treatment of chronic constipation.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant guidelines before making any treatment decisions.*
