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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a saline laxative for bowel cleansing.
## Primary Indications
Bowel preparation for diagnostic procedures (e.g., colonoscopy) or surgical procedures. Treatment of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically one 4.5 oz (133 mL) bottle administered as a single dose, followed by 12-16 ounces of clear liquid. May be administered the evening before or the morning of the procedure, as per protocol.
* **Constipation:** One 2.25 oz (66 mL) bottle administered as a single dose.
## Pediatric Dosing
* **Ages 2-5 years:** 1/4 of the adult dose (approximately 1.1 oz or 33 mL).
* **Ages 6-11 years:** 1/2 of the adult dose (approximately 2.25 oz or 66 mL).
* **Age 12 years and older:** Adult dose.
* **Under 2 years:** Safety and efficacy not established; use with extreme caution and only under strict medical supervision.
## Dose Adjustments
No specific dose adjustments are typically required based on renal or hepatic impairment, but caution is advised in patients with pre-existing electrolyte imbalances or impaired renal function.
## Contraindications
* Congestive heart failure, unstable angina, severe myocardial disease.
* Known hypersensitivity to sodium phosphate.
* Congenital or acquired megacolon.
* Gastrointestinal obstruction or perforation.
* Severe renal impairment (CrCl < 30 mL/min).
* Children under 2 years of age.
* Patients on medications that may affect renal function or electrolyte balance (e.g., diuretics, ACE inhibitors, ARBs).
* Patients with electrolyte abnormalities, particularly hyperphosphatemia or hypocalcemia.
## Adverse Effects
Common: Abdominal cramping, bloating, nausea, vomiting, diarrhea.
Serious: Hyperphosphatemia, hypocalcemia, hypernatremia, metabolic acidosis, dehydration, renal failure, cardiac arrhythmias, seizures.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia, hypocalcemia, and renal impairment.
* **Drugs affecting electrolyte balance:** Risk of additive electrolyte disturbances.
## Monitoring
* Electrolyte levels (sodium, phosphate, calcium) are crucial, especially in at-risk patients (elderly, renal impairment, concurrent medications).
* Renal function (BUN, creatinine).
* Signs of dehydration.
## Clinical Pearls
* Advise patients to drink plenty of clear liquids before and after administration to prevent dehydration and electrolyte imbalances.
* Administer slowly if cramping occurs.
* Ensure complete evacuation of the enema; retention of fluid may increase the risk of adverse effects.
* Avoid use in patients with any signs or symptoms of gastrointestinal obstruction.
* Educate patients on potential serious side effects, particularly those related to electrolyte disturbances and renal function.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines for complete and up-to-date details.*
