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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline solution that draws water into the bowel lumen, increasing intra-luminal pressure and promoting defecation. It acts as a stimulant laxative.
## 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 once. For some procedures, a second dose may be administered as directed by the physician, usually 4-12 hours after the first.
* **Constipation:** One 4.5 oz (133 mL) enema administered once every 24 hours as needed.
## Pediatric Dosing
* **Ages 2-11 years:** One 2.25 oz (66 mL) enema administered once.
* **Ages under 2 years:** Dosing is not established and use is generally not recommended due to increased risk of adverse effects.
## 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 megacolon or intestinal obstruction.
* Congestive heart failure.
* Hypertension.
* Renal impairment.
* Gastrointestinal bleeding or perforation.
* Children under 2 years of age.
* Patients with decreased bowel motility.
* Patients on medications that may affect renal function or electrolyte balance.
* Known hypersensitivity to sodium phosphate.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:** Electrolyte disturbances (hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia), dehydration, renal dysfunction, cardiac arrhythmias, seizures, syncope.
## Key Drug Interactions
* **Diuretics, ACE inhibitors, ARBs, NSAIDs:** Increased risk of hyperphosphatemia and renal impairment.
* **Calcium supplements, Vitamin D:** May exacerbate hyperphosphatemia.
* **Antacids containing magnesium:** May potentially interfere with absorption and electrolyte balance.
## Monitoring
* Electrolytes (phosphate, calcium, sodium, potassium) if risk factors are present or with frequent use.
* Renal function.
* Signs and symptoms of dehydration or electrolyte imbalance.
## Clinical Pearls
* Enemas should be administered slowly and retained for the longest possible time to ensure effectiveness.
* Patient education regarding potential side effects, especially electrolyte imbalances, is crucial, particularly in pediatric patients and those with underlying comorbidities.
* Avoid use in patients who are dehydrated or at risk for dehydration.
* Not intended for long-term or chronic use.
* Rapid infusion or excessive doses can lead to severe electrolyte abnormalities and systemic toxicity.
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**Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and relevant clinical guidelines before using this medication. Dosing and safety considerations may vary based on individual patient factors and local protocols.
