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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel cleansing.
### Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Relief of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) bottle administered as a single dose. Follow specific institutional protocols, which may involve administering half the dose in the morning and half in the evening prior to the procedure, or administering the entire dose a few hours before.
* **Constipation:** Typically, one 2.25 fl oz (66 mL) bottle. Not for long-term or frequent use.
### Pediatric Dosing
* **Constipation (age 2 years and older):** 1.125 fl oz (33 mL) to 2.25 fl oz (66 mL) once daily or as needed.
* **Bowel Preparation:** Dosing is not well-established and should be individualized based on institutional protocol, typically using smaller volumes (e.g., 1-2 fl oz or 1 mL/kg up to a maximum of 2.25 fl oz) and with extreme caution. **Use in children under 5 years for bowel prep is generally not recommended due to risk of severe electrolyte disturbances.**
### Dose Adjustments
* No specific dose adjustments are routinely required for hepatic or renal impairment, but caution is advised due to the risk of hyperphosphatemia and hypocalcemia, especially in patients with compromised kidney function.
### Contraindications
* Congestive heart failure.
* Acute renal failure.
* Congenital megacolon.
* Intestinal obstruction.
* Appendicitis.
* Gastric retention.
* Any condition that prevents adequate bowel emptying.
* Hypersensitivity to sodium phosphate.
* Use in children under 2 years for constipation.
### Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, diarrhea.
* **Serious:**
* **Electrolyte Disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, metabolic acidosis. These can lead to tetany, seizures, cardiac arrhythmias, renal failure, and death, particularly with overuse, in patients with renal impairment, or in children.
* **Dehydration.**
* **Rectal irritation/inflammation.**
* **Rare:** Allergic reactions.
### Key Drug Interactions
* **Diuretics (e.g., thiazides, loop diuretics):** Increased risk of dehydration and electrolyte imbalances.
* **ACE inhibitors/ARBs:** May increase risk of hyperkalemia.
* **Drugs affecting renal function (e.g., NSAIDs, ACE inhibitors, ARBs):** Increased risk of renal toxicity and electrolyte disturbances.
* **Calcium-containing medications:** May contribute to hyperphosphatemia.
### Monitoring
* **Electrolytes (sodium, potassium, phosphate, calcium):** Especially in patients at risk for imbalances (pediatrics, elderly, renal impairment, cardiac disease).
* **Renal function (BUN, creatinine).**
* **Hydration status.**
### Clinical Pearls
* Administer the enema slowly and as directed. Retaining the fluid for the recommended time (usually 5-15 minutes) is crucial for efficacy.
* Encourage fluid intake before and after administration to prevent dehydration.
* Avoid use in patients with pre-existing electrolyte abnormalities or risk factors for them.
* Repeated or prolonged use can lead to dependence and electrolyte disturbances.
* The risk of serious adverse events, including renal failure and death from hyperphosphatemia and hypocalcemia, has been reported, particularly in vulnerable populations.
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*This information is intended for healthcare professionals. Always verify current prescribing information with official drug compendia or the manufacturer's product information.*
