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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution that acts as a laxative by drawing water into the colon, stimulating bowel evacuation.
### Primary Indications
Constipation; bowel preparation for diagnostic procedures or surgery.
### Adult Dosing
* **Constipation:** 1 single-use enema (typically 4.5 ounces or 133 mL) administered rectally as a single dose.
* **Bowel Preparation:** 1 single-use enema (typically 4.5 ounces or 133 mL) administered rectally, usually 3-5 hours before the procedure. Some protocols may recommend a second dose. Consult local protocol for specific bowel prep regimens.
### Pediatric Dosing
* **Ages 2-11 years:** 1/2 of the adult dose (approximately 2.25 ounces or 67 mL).
* **Under 2 years:** Not recommended due to increased risk of serious adverse effects, particularly hypernatremia and dehydration. Consult a pediatrician for alternative options.
### Dose Adjustments
No specific dose adjustments are typically required based on renal or hepatic impairment. However, caution is advised in patients with compromised kidney function due to the risk of electrolyte imbalances.
### Contraindications
* Congenital or acquired megacolon.
* Anorectal stenosis or strictures.
* Bowel obstruction or perforation.
* Intestinal atony.
* Severe dehydration.
* Congestive heart failure, renal insufficiency, or other conditions where patients are prone to fluid or electrolyte retention.
* Children under 2 years of age.
* Concurrent use of other sodium phosphate preparations.
### Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, anal irritation.
* **Serious:**
* **Electrolyte Imbalances:** Hypernatremia, hypocalcemia, hyperphosphatemia, hypokalemia, metabolic acidosis. These can lead to seizures, cardiac arrhythmias, and tetany.
* **Dehydration:** Especially in children and elderly patients.
* **Renal Impairment:** Acute kidney injury has been reported, particularly with overuse or in susceptible individuals.
* **Colitis:** Rare cases of mucosal damage.
### Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte imbalances.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia.
* **Other medications that prolong QT interval:** Increased risk of cardiac arrhythmias.
### Monitoring
* Electrolytes (sodium, potassium, calcium, phosphate), especially in children, elderly, patients with renal impairment, or those receiving repeated doses.
* Renal function (BUN, creatinine).
* Signs of dehydration or fluid overload.
### Clinical Pearls
* This is a hypertonic solution; excessive use or administration to patients with contraindications can lead to severe electrolyte disturbances and dehydration.
* Administer slowly and ensure the patient retains the enema for the recommended duration (typically 5-15 minutes) to allow for adequate absorption and effect.
* Patient education on proper administration technique and potential adverse effects is crucial.
* Avoid use in patients with impaired gastric emptying or colonic motility.
* Consider alternative bowel preparation agents for patients with contraindications or significant risk factors.
Please verify current prescribing information for the most up-to-date and complete drug information.
