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# Sodium Phosphate Enema
## Overview
Sodium phosphate enemas are hypertonic saline solutions used as osmotic laxatives for bowel cleansing. They work by drawing water into the colon, which softens stool and stimulates bowel movement.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, one 4.5 fl oz (133 mL) bottle is administered. The timing of administration is critical and usually occurs several hours before the procedure, as per institutional protocol.
* **Constipation:** One 4.5 fl oz (133 mL) bottle.
## Pediatric Dosing
* **Children 2 to <12 years:** 2.25 fl oz (67.5 mL) to 4.5 fl oz (133 mL). Administer half the adult dose or one-half of the bottle. Dosing should be based on age and weight, and administered under close medical supervision.
* **Children <2 years:** Not recommended. Safety and efficacy have not been established.
## Dose Adjustments
No specific dose adjustments are routinely recommended for renal or hepatic impairment, but caution is advised due to the risk of electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Bowel obstruction or severe constipation with delayed transit.
* Congestive heart failure.
* Renal impairment (moderate to severe).
* Electrolyte abnormalities (e.g., hyperphosphatemia, hypocalcemia).
* Children under 2 years of age.
* Patients on medications that may affect renal function or electrolyte balance (e.g., diuretics, ACE inhibitors, ARBs).
* Anuria.
* Ileus.
* Abdominal pain of unknown cause.
* Nausea and vomiting.
* Patients with a colostomy or ileostomy.
* Pregnancy and breastfeeding (use with caution, benefits must outweigh risks).
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, anal irritation.
* **Serious:**
* **Electrolyte disturbances:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia, metabolic acidosis. Symptoms can include tetany, muscle spasms, cardiac arrhythmias, seizures.
* **Renal injury:** Acute kidney injury, particularly in patients with pre-existing renal disease or those who are dehydrated.
* **Dehydration.**
* **Gastrointestinal perforation** or **rupture** (rare, especially with rapid or improper administration).
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia, hypocalcemia, and renal injury. Monitor electrolytes and renal function closely.
* **Drugs affecting bowel motility:** May alter absorption or efficacy.
## Monitoring
* Electrolyte levels (serum phosphate, calcium, sodium, potassium), especially in pediatric patients, elderly, or those with renal impairment.
* Renal function (serum creatinine, BUN).
* Signs and symptoms of dehydration or electrolyte imbalance.
## Clinical Pearls
* Administer slowly to reduce cramping and expulsion.
* Ensure adequate hydration before and after administration.
* Avoid use in patients with risk factors for electrolyte imbalance or renal injury.
* Do not administer more than one enema in a 24-hour period.
* For bowel preparation, patients should follow dietary restrictions as advised by their healthcare provider.
This information is intended as a concise overview and does not replace the need to consult the most current prescribing information and institutional protocols.
