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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a saline laxative and for bowel preparation. It works by drawing water into the colon, which softens stool and stimulates bowel movements.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy) or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) enema is administered once, usually in the evening before the procedure or surgery. Some protocols may recommend a second dose on the morning of the procedure.
* **Constipation:** One 2.25 fl oz (66 mL) enema administered once.
## Pediatric Dosing
* **Constipation:**
* Ages 2-11 years: 1.125 fl oz (33 mL) enema once.
* Under 2 years: Use is generally not recommended due to increased risk of adverse effects. Consult with a pediatrician.
## Dose Adjustments
No dose adjustments are typically needed for renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
## Contraindications
* Congestive heart failure, unstable angina, or severe myocardial disease.
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Anorectal stenosis.
* Acute inflammatory bowel disease.
* Known hypersensitivity to sodium phosphate.
* Use in patients with impaired renal function (especially chronic kidney disease).
* Use in children under 2 years of age.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hyponatremia, metabolic acidosis. These can lead to seizures, cardiac arrhythmias, tetany, and acute kidney injury, particularly in patients with risk factors (e.g., renal impairment, dehydration, elderly).
* **Dehydration.**
* **Rectal bleeding.**
* **Renal damage.**
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia and renal dysfunction.
* **Calcium-containing medications:** May increase the risk of hyperphosphatemia.
* **Medications affected by bowel transit time:** Absorption may be decreased if taken shortly before or after enema administration.
## Monitoring
* Monitor for signs and symptoms of electrolyte imbalance (e.g., muscle cramps, confusion, fatigue, irregular heartbeat).
* Monitor renal function (serum creatinine) in patients with risk factors.
* Assess for abdominal pain, nausea, vomiting, and rectal irritation.
## Clinical Pearls
* **Do not use** more than one enema in a 24-hour period.
* Instruct patients to retain the enema for the recommended time (usually 5-15 minutes) for optimal effect.
* Ensure adequate hydration before and after administration, especially in at-risk populations.
* Consider alternative bowel preparation methods in patients with contraindications or increased risk of adverse events.
* Cases of severe hyperphosphatemia, hypocalcemia, and acute kidney injury have been reported, particularly with overuse or in susceptible individuals.
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*This information is intended for healthcare professionals. Please verify the current prescribing information and consult relevant guidelines before making clinical decisions.*
