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## Sodium Phosphate Enema ### Overview Sodium phosphate enema is a hypertonic saline solution that draws water into the bowel by osmosis, promoting defecation. ### Primary Indications * Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy) or surgery. * Treatment of occasional constipation. ### Adult Dosing * **Bowel Preparation:** Typically, a single 4.5-ounce (133 mL) enema administered 2 to 5 hours before the procedure. * **Constipation:** A single 2.25-ounce (66 mL) enema administered as a single dose. Maximum frequency is not established, but repeated use should be avoided. ### Pediatric Dosing * **Ages 2-11 years:** A single 1.125-ounce (33 mL) enema. * **Children under 2 years:** Contraindicated. ### Dose Adjustments No dose adjustments are typically required based on renal or hepatic function due to the limited systemic absorption. However, caution is advised in patients with impaired renal function. ### Contraindications * Congenital megacolon * Heart failure * Recent myocardial infarction * Severe renal impairment * Children under 2 years of age * Patients with ileostomy or colostomy * Patients with bowel obstruction or perforation * Patients with symptoms of appendicitis, nausea, vomiting, or abdominal pain. ### Adverse Effects * **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation. * **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, metabolic acidosis, dehydration, electrolyte imbalance, renal impairment, seizures, arrhythmias. These are more common with overuse, in pediatric patients, or in patients with underlying renal disease. ### Key Drug Interactions * **Diuretics:** Increased risk of electrolyte imbalance. * **ACE inhibitors and ARBs:** Increased risk of hyperkalemia. * **Drugs affecting renal function (e.g., NSAIDs):** May increase the risk of renal damage. ### Monitoring * Monitor for signs and symptoms of electrolyte imbalance (e.g., dizziness, confusion, muscle weakness, palpitations, excessive thirst, decreased urine output). * Monitor renal function, especially in patients with pre-existing renal disease or those using concurrent nephrotoxic agents. ### Clinical Pearls * This product should not be used for infants or children under 2 years of age. * Avoid concurrent use of other phosphate-containing laxatives or medications to prevent excessive phosphate absorption. * Ensure adequate hydration before and after administration. * Do not administer more frequently than recommended due to the risk of severe electrolyte disturbances. *** *Please verify the current prescribing information for the most up-to-date and comprehensive details.*