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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 intraluminal pressure, and promoting defecation.
## Primary Indications
* Bowel preparation for diagnostic procedures (e.g., colonoscopy, sigmoidoscopy).
* Short-term treatment of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically, a single dose of 4.4 oz (130 mL) is administered as a rectal enema. Some protocols may recommend a second dose if needed, but total daily intake should not exceed 4.4 oz in a 24-hour period for most formulations. Specific timing is crucial and depends on the procedure (e.g., evening before).
* **Constipation:** 2.25 oz (66 mL) rectal enema administered as a single dose.
## Pediatric Dosing
Dosing in children is generally not recommended unless under strict medical supervision due to increased risk of adverse effects. If used:
* **Ages 2-11 years:** 1.125 oz (33 mL) rectal enema administered as a single dose.
* **Below 2 years:** Use is generally contraindicated.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment, but caution is advised, especially in elderly patients or those with compromised renal function due to the risk of electrolyte disturbances.
## Contraindications
* Congenital or acquired megacolon.
* Intestinal obstruction or perforation.
* Severe renal impairment.
* Congestive heart failure.
* Hypertension.
* Acute bowel obstruction.
* Known hypersensitivity to sodium phosphate.
* Use with other sodium phosphate products.
* Children younger than 2 years.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:** Hyperphosphatemia, hypocalcemia, hypernatremia, metabolic acidosis, dehydration, electrolyte imbalances, cardiac arrhythmias, renal failure, seizures. Risk is higher in pediatric patients, elderly, and those with renal impairment or cardiac issues.
## Key Drug Interactions
* **Diuretics (thiazide and loop):** Increased risk of dehydration and electrolyte imbalances.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia and renal impairment.
* **Lithium:** May decrease lithium clearance, leading to increased levels.
* **Other laxatives:** Increased risk of dehydration and electrolyte depletion.
## Monitoring
* Electrolytes (sodium, phosphate, calcium, potassium).
* Renal function (BUN, creatinine).
* Hydration status.
* Signs and symptoms of electrolyte imbalance.
## Clinical Pearls
* Sodium phosphate enemas are potent and should be used sparingly.
* Ensure adequate hydration before and after administration.
* Caution with elderly patients and those with renal or cardiac comorbidities.
* Do not administer to infants or young children unless specifically directed by a physician.
* Patients should be instructed to retain the enema for the duration specified by the product insert or healthcare provider to maximize efficacy.
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*Please verify the current prescribing information for the specific formulation being used, as details may vary.*
