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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution that acts as a stimulant laxative and osmotic agent, drawing water into the colon to soften stool and increase bowel motility.
## Primary Indications
Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy) and surgical procedures.
Treatment of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, a single 4.5 oz (133 mL) enema is administered 3-5 hours prior to the procedure.
* **Constipation:** 1 to 1.5 (4.5 oz or 90 mL) enema may be administered every 24 hours as needed. Do not use for more than 7 consecutive days without consulting a healthcare provider.
## Pediatric Dosing
* **Ages 2-11 years:** One-half the adult dose (2.25 oz or 45 mL) may be administered.
* **Under 2 years:** Contraindicated due to increased risk of serious adverse events.
## Dose Adjustments
No specific dose adjustments are routinely recommended for hepatic or renal impairment, but caution is advised due to the risk of electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Heart failure, congestive heart failure.
* Severe renal impairment.
* Gastrointestinal obstruction or perforation.
* Children under 2 years of age.
* Patients with ileostomy or colostomy.
* Patients with nausea, vomiting, abdominal pain, or other symptoms of appendicitis or undiagnosed abdominal pain.
* Patients with inadequate fluid intake or those at risk for dehydration.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte Disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hyponatremia, metabolic acidosis. This is a significant concern, especially in children, the elderly, and patients with renal impairment or those receiving other medications affecting electrolytes. Symptoms may include muscle cramps, weakness, dizziness, confusion, lethargy, irregular heartbeat, and seizures.
* **Dehydration.**
* **Renal injury.**
* **Rhabdomyolysis.**
## Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalances.
* **Medications affecting renal function (e.g., NSAIDs, ACE inhibitors, ARBs):** Increased risk of renal injury and electrolyte disturbances.
* **Calcium channel blockers:** Potential for hyperphosphatemia and hypocalcemia.
* **Drugs prolonging QT interval:** May increase risk of arrhythmias if electrolyte imbalances occur.
## Monitoring
* **Electrolytes:** Monitor serum electrolytes (phosphate, calcium, sodium, potassium) particularly in at-risk populations (pediatric, elderly, renal impairment, cardiac conditions) and if signs of electrolyte imbalance are present.
* **Renal function:** Monitor BUN and creatinine in at-risk populations.
* **Hydration status.**
## Clinical Pearls
* This product should be used with extreme caution in pediatric patients, the elderly, and patients with renal disease, heart disease, or those on fluid restriction.
* Ensure adequate hydration before and after administration.
* Do not use if the seal on the bottle is broken.
* Administer slowly to minimize cramping.
* Retain the enema for the prescribed time (usually 5-15 minutes) or as long as possible to ensure effectiveness.
* Educate patients on signs and symptoms of electrolyte imbalance and dehydration.
* Consider alternatives for bowel preparation in patients with contraindications.
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*Please verify the information with the most current prescribing information or official drug compendium.*
