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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a saline laxative for bowel cleansing.
### Primary Indications
* Bowel preparation for colonoscopy or surgery.
* Relief of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically 1 unit (4.5 oz or 133 mL) administered orally or rectally as directed by physician or protocol. For oral administration, the dose is often split, with the first dose taken the evening before the procedure and the second dose several hours before. Rectal administration usually involves the entire contents of one enema.
* **Constipation:** 1 unit (4.5 oz or 133 mL) administered rectally as a single dose. Do not use more than 1 unit in a 24-hour period.
### Pediatric Dosing
* **Constipation:** For children 5 years and older, 1/2 to 1 unit (2.25 to 4.5 oz or 66.5 to 133 mL) rectally as a single dose.
* **Bowel Preparation:** Dosing is based on age and weight, and specific protocols should be followed. Consult pediatric-specific guidelines.
### Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment due to the limited systemic absorption of typical doses. However, caution is advised in patients with pre-existing electrolyte imbalances or compromised renal function.
### Contraindications
* Congestive heart failure.
* Gastrointestinal obstruction or perforation.
* Severe renal impairment (CrCl < 30 mL/min).
* Congenital or acquired megacolon.
* Hypersensitivity to sodium phosphate.
* Children under 5 years of age for constipation relief.
* Patients who cannot tolerate the large fluid volume or have difficulty retaining the enema.
### Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, acute phosphate nephropathy, renal failure, cardiac arrhythmias, seizures, particularly in children and patients with underlying risk factors.
### Key Drug Interactions
* **Diuretics:** May increase the risk of dehydration and electrolyte imbalances.
* **ACE Inhibitors/ARBs:** May increase the risk of hyperkalemia.
* **Other laxatives:** Concurrent use can potentiate fluid and electrolyte losses.
### Monitoring
* **Electrolytes:** Serum phosphate, calcium, sodium, and potassium, especially in patients with renal impairment, elderly patients, or those receiving repeated doses.
* **Renal function:** Monitor for signs of acute phosphate nephropathy.
* **Hydration status.**
### Clinical Pearls
* Ensure adequate oral hydration before and after administration.
* Do not administer orally to patients with decreased gastrointestinal motility or impaired gag reflex.
* The oral preparation contains 32g of sodium phosphate and 16g of dibasic sodium phosphate per 45mL (diluted to 177mL for consumption), which is significantly more phosphate than the rectal enema.
* Use with extreme caution in children and the elderly due to increased risk of electrolyte disturbances and renal complications.
* Consider alternative bowel preparations in patients with contraindications or significant risk factors.
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*Please verify this information with the most current prescribing information and relevant clinical guidelines.*
