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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution that acts as a stimulant laxative by drawing water into the colon, increasing bowel motility and softening stool.
### Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Relief of occasional constipation.
### Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) bottle administered once, usually the evening before the procedure or as directed by the prescribing provider. Do not administer more than one bottle in 24 hours.
* **Constipation:** Typically, one 4.5 fl fl oz (133 mL) bottle administered once, or as directed by the prescribing provider. Do not administer more than one bottle in 24 hours.
### Pediatric Dosing
* **Children < 12 years:** Not recommended. Safety and efficacy have not been established.
* **Children 12 years and older:** Same as adult dosing.
### Dose Adjustments
* **Renal Impairment:** Use with caution. Patients with moderate to severe renal impairment are at increased risk of hyperphosphatemia, hypocalcemia, and acute kidney injury.
* **Elderly:** Use with caution. Elderly patients may be more susceptible to fluid and electrolyte imbalances.
### Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Ileus.
* Congenital gastrointestinal malformation.
* Heart failure.
* Patients with impaired renal function (moderate to severe).
* Patients on medications that may affect renal function or electrolyte balance (e.g., diuretics, ACE inhibitors, ARBs).
* Children under 12 years of age.
* Known hypersensitivity to sodium phosphate.
### Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, bloating, diarrhea.
* **Serious:**
* **Electrolyte Abnormalities:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, metabolic acidosis. Symptoms may include muscle cramps, tetany, confusion, seizures, cardiac arrhythmias.
* **Renal Impairment:** Acute kidney injury, chronic kidney disease.
* **Dehydration.**
* **Rectal irritation or bleeding.**
* **Rarely, severe systemic toxicity including fatalities** has been reported, particularly in pediatric patients or those with underlying risk factors.
### Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia and kidney injury.
* **Calcium-containing medications:** May increase the risk of hyperphosphatemia and nephrocalcinosis.
* **Other laxatives:** Increased risk of dehydration and electrolyte imbalance.
### Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, decreased urination, dizziness, muscle cramps, confusion, irregular heartbeat).
* Consider baseline and post-administration serum electrolytes and renal function in patients with risk factors (e.g., renal impairment, elderly).
### Clinical Pearls
* Instruct patients to drink plenty of clear fluids before and after administration to prevent dehydration.
* Do not use in patients with unexplained abdominal pain, nausea, or vomiting.
* Ensure the enema is at room temperature before administration.
* Administer slowly and retain as long as possible to be effective.
* Limit use to occasional constipation. Chronic use can lead to dependence.
* Due to the risk of severe adverse events, especially in vulnerable populations, alternative bowel preparation methods may be preferred.
**Disclaimer:** This information is intended for clinical pharmacists and should not be used as a substitute for professional medical advice. Always consult the most current prescribing information and clinical guidelines before making any treatment decisions.
