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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic solution used as a saline laxative for bowel preparation. It works by drawing water into the colon, which softens the stool and stimulates bowel evacuation.
## Primary Indications
* Bowel cleansing prior to colonoscopy, sigmoidoscopy, or radiologic examination of the bowel.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) enema administered 2-5 hours before the procedure, or as per institutional protocol.
* **Constipation:** One 4.5 fl oz (133 mL) enema administered as a single dose.
## Pediatric Dosing
* **Children 2-11 years:** Use with caution. Dosing is not well-established and should be guided by institutional protocol or a healthcare provider. A typical dose may be 2.5 fl oz (74 mL), administered 1-5 hours before the procedure.
* **Children under 2 years:** Contraindicated due to risk of severe electrolyte abnormalities and dehydration.
## Dose Adjustments
* No specific dose adjustments are typically required in adults with hepatic or renal impairment, but caution is advised due to the risk of electrolyte imbalances.
## Contraindications
* Congestive heart failure
* Newly diagnosed heart block
* Hyperphosphatemia
* Hypocalcemia
* Hypermagnesemia
* Hypersensitivity to sodium phosphate
* Children under 2 years of age
* Patients with impaired renal function (e.g., renal insufficiency, chronic kidney disease, renal transplant)
* Patients on medications that may affect renal function or electrolyte balance (e.g., diuretics, ACE inhibitors, ARBs)
* Obstruction of the bowel
* Patients with colostomy or ileostomy
* Patients with toxic megacolon or severe abdominal pain, nausea, or vomiting
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, anal irritation.
* **Serious:**
* **Electrolyte abnormalities:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, hypomagnesemia. Symptoms can include tetany, muscle cramps, paresthesias, cardiac arrhythmias, seizures.
* **Dehydration:** Particularly in children or elderly patients.
* **Renal injury:** Acute kidney injury, especially in patients with underlying renal disease or those who are dehydrated.
* **Arrhythmias:** Can be associated with severe electrolyte disturbances.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of renal toxicity and electrolyte disturbances.
* **Medications affecting gastric motility:** May alter the absorption and efficacy of other oral medications administered around the time of bowel preparation.
* **Calcium or magnesium-containing antacids:** May increase the risk of hyperphosphatemia.
## Monitoring
* Electrolytes (sodium, potassium, phosphate, calcium)
* Renal function (BUN, creatinine)
* Hydration status
## Clinical Pearls
* This product should not be used for the treatment of chronic constipation.
* Patients should be advised to drink plenty of clear fluids before and after administration to prevent dehydration.
* Avoid concurrent use of other phosphate-containing medications or laxatives.
* The enema should be administered slowly and retained for the recommended time to ensure efficacy and minimize discomfort.
* Use with extreme caution, or avoid, in elderly patients, those with renal impairment, or those with any condition that predisposes them to dehydration or electrolyte imbalance.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always verify current prescribing information and consult with a healthcare provider for any medical concerns.*
