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### Sodium Phosphate Enema
**Overview**
Sodium phosphate enema is a hypertonic saline solution that acts as a stimulant laxative by drawing water into the colon, increasing bowel motility, and softening stool.
**Primary Indications**
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Relief of occasional constipation.
**Adult Dosing**
* **Bowel Preparation:** Typically, one 4.5 oz (133 mL) enema administered 3-6 hours before the procedure, or as directed by local protocol. Some protocols may recommend a second dose 1-2 hours before the procedure.
* **Constipation Relief:** One 2.25 oz (66 mL) enema administered as a single dose. Maximum frequency is typically once daily.
**Pediatric Dosing**
* **Children 2 to <12 years:** One 5.5 mL dose (using a pediatric applicator if available, or a smaller dose from the adult preparation), administered as directed by a physician. **Caution:** Use in this age group requires careful consideration due to increased risk of toxicity.
* **Children <2 years:** Not recommended due to significant risk of hypernatremia, dehydration, and potential cardiac and renal complications.
**Dose Adjustments**
* No specific dose adjustments are typically required for hepatic or renal impairment, however, caution is advised in patients with severe renal impairment due to the risk of phosphate accumulation.
**Contraindications**
* Congenital or acquired megacolon.
* Gastrointestinal obstruction or perforation.
* Ileus.
* Severe renal impairment.
* Congestive heart failure.
* Acute inflammatory bowel disease.
* Known hypersensitivity to sodium phosphate.
* Patients with hyperphosphatemia or hypocalcemia.
* Children under 2 years of age.
**Adverse Effects**
* **Common:** Abdominal cramping, nausea, vomiting, bloating, rectal irritation.
* **Serious:** Electrolyte disturbances (hypernatremia, hyperphosphatemia, hypocalcemia, hypokalemia), dehydration, cardiac arrhythmias, renal failure (especially with overuse or in susceptible individuals), seizures.
**Key Drug Interactions**
* **Diuretics (thiazide, loop):** Increased risk of electrolyte imbalance.
* **Drugs affecting renal function (ACE inhibitors, ARBs, NSAIDs):** Increased risk of renal impairment and electrolyte disturbances.
* **Calcium-containing products:** Potential for calcium-phosphate complex formation.
* **Laxatives:** Additive effect, increased risk of electrolyte imbalance and dehydration.
**Monitoring**
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, decreased urination, dizziness, weakness, confusion, arrhythmias).
* Electrolyte panels (sodium, potassium, phosphate, calcium) may be considered in patients at high risk, particularly with repeated use or in pediatric patients.
* Renal function may be monitored in patients with pre-existing renal disease or risk factors.
**Clinical Pearls**
* Due to the risk of serious electrolyte abnormalities, sodium phosphate enemas should be used cautiously and according to recommended dosages and frequencies.
* Avoid concurrent use with other phosphate-containing laxatives or medications.
* Ensure adequate hydration before and after administration, especially in elderly patients and those with renal or cardiac compromise.
* Educate patients on proper administration technique.
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*Please verify this information with the most current prescribing information or relevant clinical guidelines.*
