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# Sodium Phosphate Enema (e.g., Fleet Enema)
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative for bowel cleansing. It works by drawing water into the colon, which softens stool and stimulates bowel movement.
## Primary Indications
* Bowel preparation prior to colonoscopy or surgical procedures.
* Relief of occasional constipation.
## Adult Dosing
**Bowel Preparation:**
* Administer one (1) 4.5 fl oz (133 mL) enema bottle rectally, as directed, typically in divided doses (e.g., one bottle the evening before and one bottle the morning of the procedure). Follow specific institutional or procedural protocols.
**Constipation:**
* Administer one (1) 2.25 fl oz (65 mL) enema bottle rectally, as needed. Do not exceed one dose in 24 hours.
## Pediatric Dosing
* **Constipation:**
* Children 2 to <12 years: Administer one (1) 2.25 fl oz (65 mL) enema bottle rectally, as needed.
* Children <2 years: Safety and efficacy not established. Consult with a pediatrician. Dosing, if used, will be highly individualized and require careful monitoring.
## Dose Adjustments
No dose adjustments are typically needed based on renal or hepatic impairment for occasional use. However, caution is advised in patients with pre-existing renal impairment due to potential for electrolyte disturbances.
## Contraindications
* Congenital megacolon.
* Intestinal obstruction or atresia.
* Congenital or acquired hind-gut stenosis.
* Heart failure.
* Kidney disease (including renal insufficiency).
* Active inflammatory bowel disease.
* Children under 2 years of age.
* Patients with impaired gag reflex or risk of aspiration.
* Patients with conditions that may lead to prolonged retention of the enema.
## Adverse Effects
* **Common:** Abdominal cramping, nausea, vomiting, rectal irritation, bloating.
* **Serious:**
* **Hyperphosphatemia:** Can lead to hypocalcemia and tetany, particularly in children or those with renal impairment. Symptoms include muscle twitching, tingling, numbness, and seizures.
* **Hyponatremia:** Can lead to confusion, seizures, and coma.
* **Hypernatremia:** Can lead to dehydration, lethargy, and neurological changes.
* **Dehydration:** Especially with overuse or in susceptible individuals.
* **Electrolyte imbalance:** Including hypokalemia.
* **Rectal bleeding or perforation:** Rare but serious.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperkalemia and renal dysfunction.
* **Drugs affecting electrolyte balance:** Concomitant use with other agents that can alter electrolytes (e.g., other laxatives, corticosteroids) may exacerbate electrolyte disturbances.
## Monitoring
* Monitor for signs and symptoms of electrolyte imbalance (e.g., muscle cramps, weakness, nausea, vomiting, confusion, seizures).
* Assess hydration status.
* Monitor renal function and electrolytes (especially phosphate, calcium, sodium, potassium) in patients with risk factors (e.g., renal impairment, young children, elderly, those with cardiac disease).
## Clinical Pearls
* For bowel preparation, ensure adequate hydration before and after administration as per protocol.
* Patient education regarding proper administration technique is crucial to minimize adverse effects and ensure efficacy.
* Avoid use in patients with risk factors for electrolyte abnormalities or dehydration.
* Consider alternative bowel preparation methods in patients with contraindications.
* The hypertonic nature of the enema is key to its mechanism of action and also contributes to its adverse effect profile.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for current prescribing information or professional medical advice. Always consult the official drug monograph and relevant clinical guidelines before prescribing or administering any medication. Dosing may vary based on patient-specific factors and local protocols.*
