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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel cleansing prior to colonoscopy, barium enema, or surgical procedures. It acts by drawing water into the colon, stimulating peristalsis and promoting defecation.
### Primary Indications
* Bowel preparation for diagnostic or surgical procedures.
### Adult Dosing
* **Single dose:** Typically 4.5 ounces (133 mL) administered rectally as a single dose. Administer slowly.
* **Maximum:** Do not administer more than one full-strength dose within 24 hours.
### Pediatric Dosing
* **Ages 2-11 years:** 2.5 ounces (75 mL) administered rectally as a single dose.
* **Ages under 2 years:** Not recommended due to increased risk of serious adverse events.
### Dose Adjustments
* No specific dose adjustments are typically required based on renal or hepatic impairment, but caution is warranted in patients with pre-existing electrolyte imbalances or renal disease.
### Contraindications
* Congenital megacolon.
* Heart failure.
* Renal impairment.
* Constrictive pericarditis.
* Anuria or oliguria.
* Hyperphosphatemia.
* Hypocalcemia.
* Electrolyte disturbances.
* Patients with significant renal impairment or those on medications that may affect renal function (e.g., diuretics, ACE inhibitors, ARBs, NSAIDs).
* Children under 2 years of age.
* Patients with bowel obstruction or perforation.
### Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hyponatremia, hypokalemia. This can lead to cardiac arrhythmias, tetany, seizures, and renal failure.
* **Dehydration:** Due to osmotic fluid shifts.
* **Renal toxicity:** Acute kidney injury, especially in patients with pre-existing renal disease or risk factors.
* **Colitis:** Inflammation of the colon.
### Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of renal toxicity and electrolyte imbalances.
* **Medications affecting electrolytes (e.g., calcium, potassium supplements):** May exacerbate electrolyte disturbances.
### Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalances (e.g., thirst, dry mouth, decreased urine output, confusion, muscle weakness, cardiac palpitations).
* Electrolyte levels (phosphate, calcium, sodium, potassium) may be considered in patients at high risk for disturbances.
* Renal function (e.g., serum creatinine) may be monitored in patients with risk factors.
### Clinical Pearls
* This product is a hypertonic solution and should be administered as directed to minimize systemic absorption and electrolyte disturbances.
* Patients should be instructed to drink clear liquids before and after administration to prevent dehydration.
* Avoid repeated use or prolonged administration.
* Use with caution in elderly patients and those with pre-existing conditions that predispose them to fluid and electrolyte imbalances or renal impairment.
* For pediatric use, ensure accurate measurement of the reduced volume.
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*Please verify current prescribing information for the most up-to-date details, including specific product formulations and warnings.*
