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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel cleansing. It works by drawing water into the colon, stimulating bowel movement.
### Primary Indications
* Bowel preparation prior to colonoscopy or surgery.
* Relief of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) enema administeredrectally. Dosing may vary based on specific protocols; consult local guidelines.
* **Constipation Relief:** One 2.25 fl oz (67 mL) enema administered rectally.
### Pediatric Dosing
* **Under 2 years:** Contraindicated.
* **2 to 5 years:** One 1.125 fl oz (33 mL) dose administered rectally.
* **6 to 11 years:** One 2.25 fl oz (67 mL) dose administered rectally.
* **12 years and older:** Same as adult dosing.
### Dose Adjustments
No specific dose adjustments are typically required based on renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
### Contraindications
* Congestive heart failure.
* Severe renal impairment.
* Congenital megacolon.
* Intestinal obstruction or perforation.
* Children under 2 years of age.
* Known hypersensitivity to sodium phosphate.
* Conditions where increased rectal absorption is a concern (e.g., Hirschsprung disease).
### Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, renal failure, cardiac arrhythmias, seizures. These are more likely with overuse, rapid administration, or in susceptible individuals.
### Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalances.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia.
* **Lithium:** May decrease lithium absorption.
* **Other laxatives:** Avoid concurrent use to prevent excessive fluid and electrolyte loss.
### Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, dry mouth, dizziness, decreased urine output, muscle cramps, confusion).
* Electrolyte levels (phosphate, calcium, sodium, potassium) may be monitored in patients at high risk, especially with repeated doses or underlying medical conditions.
### Clinical Pearls
* Administer slowly and as high as possible into the rectum.
* Advise patients to retain the enema for the recommended duration (typically 5-10 minutes or as instructed) for maximum effectiveness.
* Ensure adequate hydration before and after administration.
* Use with extreme caution in elderly, debilitated, or pediatric patients due to increased risk of electrolyte disturbances.
* Avoid repeated use.
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*Please verify the current prescribing information for complete details before initiating treatment.*
