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# Sodium Phosphate Enema ## Overview Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel preparation. ## Primary Indications * Bowel evacuation prior to colonoscopy, sigmoidoscopy, or radiologic examination. * Relief of occasional constipation. ## Adult Dosing * **Bowel preparation:** 1 enema (typically 4.5-6 oz, containing approximately 2.5-3g sodium phosphate and 1g phosphate) administered 2-5 hours before the procedure, or as per institutional protocol. * **Constipation:** 1 enema (as above) administered as a single dose. ## Pediatric Dosing * **Children 2-12 years:** 1/2 to 1 enema (2.25-4.5 oz, containing approximately 1.25-2.5g sodium phosphate and 0.5-1g phosphate) administered as a single dose. Dosing should be individualized and may depend on patient size. * **Children < 2 years:** Use is generally not recommended due to increased risk of toxicity. Consult with a pediatrician or pediatric gastroenterologist for alternative options. ## Dose Adjustments No specific dose adjustments are typically required for hepatic or renal impairment due to the limited systemic absorption and short-term use. However, caution is advised in patients with significant renal or hepatic disease due to potential electrolyte imbalances. ## Contraindications * Congenital or acquired megacolon. * Congestive heart failure. * Renal impairment (severe). * Ileus or bowel obstruction. * Abdominal pain, nausea, or vomiting of unknown origin. * Children under 2 years of age. * Patients with impaired ability to retain the enema. ## Adverse Effects * **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation. * **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, cardiac arrhythmias, kidney damage, seizures. These are more likely in patients with underlying risk factors or with overuse. ## Key Drug Interactions * Diuretics: Increased risk of electrolyte imbalance. * ACE inhibitors and ARBs: Increased risk of hyperkalemia and renal dysfunction. * Drugs affecting gastric motility: May alter absorption and effectiveness. ## Monitoring * Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, dry mouth, decreased urine output, dizziness, muscle cramps, irregular heartbeat). * In patients with risk factors for electrolyte disturbances, consider monitoring serum electrolytes and renal function. ## Clinical Pearls * Ensure patients understand the administration technique to maximize effectiveness and minimize discomfort. * Advise patients to drink plenty of clear fluids before and after administration to prevent dehydration. * Avoid repeated use in a short period to prevent electrolyte disturbances and laxative dependence. * Use with caution in elderly patients and those with existing cardiac, renal, or hepatic conditions. --- *Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and your healthcare provider for any questions regarding medication use.*