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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution used as a laxative and purgative for bowel cleansing prior to colonoscopy, surgery, or for the relief of occasional constipation. It works by drawing water into the colon, which softens stool and stimulates bowel movement.
## Primary Indications
* Bowel preparation for diagnostic and surgical procedures.
* Relief of occasional constipation.
## Adult Dosing
* **Constipation:** One 4.5 oz enema administered rectally as a single dose.
* **Bowel Preparation:** Typically administered as one 4.5 oz enema rectally. Some protocols may involve a second dose depending on the timing of the procedure. Always follow specific institutional or provider protocols.
## Pediatric Dosing
* **Children 2-11 years:** One 2.25 oz enema administered rectally as a single dose.
* **Children < 2 years:** Generally not recommended. Consult with a pediatrician. Safety and efficacy in this age group are not well established.
## Dose Adjustments
No dose adjustments are typically required based on renal or hepatic impairment, as systemic absorption is minimal. However, caution is advised in patients with impaired renal function due to the risk of hyperphosphatemia and hypocalcemia.
## Contraindications
* Congenital or acquired megacolon.
* Anorectal stenosis.
* Heart failure.
* Hypertension.
* Pregnancy and lactation (use with caution and only if clearly needed).
* Patients with impaired renal function or those on medications that affect renal function (e.g., diuretics, ACE inhibitors, ARBs).
* Patients with electrolyte imbalances, particularly hyperphosphatemia, hypocalcemia, or hypernatremia.
* Children under 2 years of age.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, dehydration, electrolyte imbalances, cardiac arrhythmias, renal damage, colitis, perforation.
## Key Drug Interactions
* **Diuretics:** Increased risk of electrolyte imbalances (hyperphosphatemia, hypocalcemia, hypernatremia) and dehydration.
* **ACE inhibitors, ARBs:** Increased risk of hyperkalemia and renal dysfunction.
* **NSAIDs:** May increase the risk of renal toxicity.
* **Lithium:** Decreased absorption of lithium due to altered GI transit time.
## Monitoring
* Electrolyte levels (phosphate, calcium, sodium, potassium) before and after administration, especially in vulnerable populations or with repeated use.
* Renal function (BUN, creatinine).
* Signs and symptoms of dehydration or electrolyte imbalance.
## Clinical Pearls
* Administer slowly and retain for the recommended time (usually 2-5 minutes) to ensure efficacy and minimize discomfort.
* Do not use in patients with bowel obstruction or undiagnosed abdominal pain.
* Avoid repeated use, as this can lead to electrolyte disturbances and laxative dependence.
* Educate patients on the importance of hydration before and after use.
* Ensure proper administration technique to minimize the risk of rectal injury.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before use.*
