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# Sodium Phosphate Enema
## Overview
Sodium phosphate enemas are hypertonic saline solutions that draw water into the bowel lumen, stimulating peristalsis and acting as a laxative for bowel evacuation.
## Primary Indications
* Bowel preparation prior to colonoscopy or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically a single dose of 45 mL (Fleet Enema or equivalent) administered rectally. Some protocols may recommend a second dose, which should be clearly defined in the patient's specific orders.
* **Constipation:** Typically a single dose of 2.25 oz (approximately 66 mL) administered rectally.
## Pediatric Dosing
Dosing in children is not well-established and should be based on specific institutional protocols and under close medical supervision. Generally, smaller volumes are used for younger children, but precise mg/kg or mL/kg guidelines are not routinely available. Consult with a pediatrician or pediatric gastroenterologist.
## Dose Adjustments
No dose adjustments are typically required based on renal or hepatic impairment, as the drug is primarily acting locally in the bowel. However, caution is advised in patients with pre-existing renal disease (see Contraindications and Adverse Effects).
## Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Appendicitis or unexplained abdominal pain.
* Severe renal impairment (Stage 4 or 5 chronic kidney disease).
* Heart failure, severe heart disease, or known or suspectedädiganomoly or disease.
* Electrolyte restrictions.
* Young children (under 2 years of age) due to increased risk of hyperphosphatemia, hypocalcemia, and dehydration.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte Imbalance:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration. These are particularly concerning in patients with renal impairment, pediatric patients, and with overuse. Symptoms can include muscle cramps, tetany, cardiac arrhythmias, and seizures.
* **Renal Injury:** Acute kidney injury can occur, especially with repeated use or in susceptible individuals.
* **Gastrointestinal Perforation:** Rare but serious complication, especially if instilled against resistance.
## Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte abnormalities.
* **ACE Inhibitors/ARBs:** Potential for increased risk of hyperkalemia, especially in patients with underlying renal dysfunction.
* **Other Laxatives:** Avoid concurrent use of other stimulant laxatives to prevent excessive bowel stimulation and dehydration.
## Monitoring
* **Electrolytes:** Particularly phosphate, calcium, and sodium levels, especially in patients with risk factors (renal impairment, pediatric, repeated use).
* **Renal function:** Assess baseline and consider post-use monitoring in at-risk individuals.
* **Hydration status:** Monitor for signs of dehydration.
## Clinical Pearls
* This medication acts as an osmotic laxative by drawing water into the colon.
* Administer slowly and instruct the patient to retain the fluid for as long as possible (ideally 5-15 minutes) to maximize effectiveness.
* Avoid use in patients with suspected or known bowel obstruction or perforation.
* Caution is strongly advised in pediatric patients and those with impaired renal function due to the significant risk of severe electrolyte disturbances.
* Do not use for chronic constipation; reserve for occasional use or bowel preparation.
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**Disclaimer:** This information is intended for clinical decision support and does not replace comprehensive drug compendia or specific product labeling. Always verify current prescribing information with the official drug monograph or a reliable drug information resource before initiating or modifying therapy.
