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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a saline laxative for bowel cleansing. It works by drawing water into the colon, which softens stool and stimulates bowel movement.
### Primary Indications
* Bowel preparation prior to colonoscopy or surgery.
* Relief of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema administered once, 2-5 hours before the procedure. Some protocols may recommend a second dose.
* **Constipation:** One 2.25 oz (65 mL) enema administered once every 24 hours as needed. Maximum dose for constipation is 2.25 oz (65 mL) per 24 hours.
### Pediatric Dosing
* **Children 2-11 years:** One 1.125 oz (33 mL) enema administered once every 24 hours as needed. Do not exceed one dose per 24 hours.
* **Children under 2 years:** Contraindicated.
### Dose Adjustments
No dose adjustments are typically required for renal or hepatic impairment due to the limited systemic absorption when used as directed. However, caution is advised in patients with compromised kidney function.
### Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Severe renal impairment (CrCl < 30 mL/min).
* Congestive heart failure.
* Children under 2 years of age.
* Hypersensitivity to sodium phosphate.
* Patients on medications that may affect electrolyte balance (e.g., diuretics, ACE inhibitors).
### Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, diarrhea.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, metabolic acidosis, dehydration, rectal irritation or ulceration, seizures (especially in children or those with underlying risk factors).
### Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs:** Increased risk of hyperphosphatemia, hypocalcemia, and dehydration.
* **Calcium-containing medications:** May contribute to hyperphosphatemia.
* **Medications affecting bowel motility:** May alter absorption or efficacy.
### Monitoring
* Monitor for signs of dehydration (e.g., dry mouth, decreased urination, dizziness).
* Monitor electrolytes (phosphate, calcium, sodium) if risk factors are present or if used frequently.
* Assess for abdominal pain, distension, nausea, and vomiting.
### Clinical Pearls
* Instruct patients to drink plenty of clear fluids before and after administration to prevent dehydration.
* Do not use for more than one week unless directed by a physician.
* Avoid if experiencing nausea, vomiting, or abdominal pain.
* Use with extreme caution in elderly patients and those with renal impairment.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the official prescribing information and current clinical guidelines before making any treatment decisions.
