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# Sodium Phosphate Enema
## Overview
Sodium phosphate enema is a hypertonic saline laxative used for bowel cleansing.
## Primary Indications
* Bowel preparation for colonoscopy or surgery.
* Relief of occasional constipation.
## Adult Dosing
* **Bowel Preparation:** Typically a single 4.5 fl oz (133 mL) bottle administered 2-5 hours before the procedure. Follow package instructions carefully. For some protocols, a second dose may be administered.
* **Constipation:** 2.25 fl oz (66 mL) administered within 5 minutes. Do not use more than once daily or for more than 7 consecutive days.
## Pediatric Dosing
* **Children 5-11 years:** 2.25 fl oz (66 mL).
* **Children < 5 years:** Contraindicated due to increased risk of serious adverse events, including hypernatremia, hypocalcemia, and renal injury.
## Dose Adjustments
* No dose adjustments are typically required for hepatic or renal impairment, but caution is advised due to potential for electrolyte disturbances.
## Contraindications
* Congestive heart failure, newly diagnosed heart failure.
* Ascites.
* Gastric bypass or gastrojejunostomy patients.
* Congenital or acquired megacolon.
* Bowel obstruction.
* Anuria.
* Children under 5 years of age.
* Patients with renal impairment (CrCl < 30 mL/min).
* Patients taking medications that may affect renal function (e.g., diuretics, ACE inhibitors, ARBs).
* Concurrent use of other sodium phosphate bowel preparations.
* Known hypersensitivity to sodium phosphate.
## Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, diarrhea.
* **Serious:**
* **Electrolyte Disturbances:** Hypernatremia, hypocalcemia, hyperphosphatemia, hypokalemia, dehydration. These can lead to tetany, seizures, cardiac arrhythmias, renal failure, and death. Risk is increased in elderly, renally impaired, or dehydrated patients.
* **Renal Impairment:** Acute phosphate nephropathy, chronic kidney disease.
* **Other:** Rectal irritation, anal irritation.
## Key Drug Interactions
* **Drugs affecting renal function:** Concurrent use with diuretics, ACE inhibitors, ARBs, NSAIDs, or other nephrotoxic agents increases the risk of renal impairment and electrolyte disturbances.
* **Drugs affected by electrolyte shifts:** Diuretics, antihypertensives, digoxin, lithium.
## Monitoring
* Electrolyte levels (sodium, potassium, phosphate, calcium) before and after use, especially in at-risk patients.
* Renal function (BUN, creatinine) before and after use in at-risk patients.
* Hydration status.
## Clinical Pearls
* Patient counseling is crucial regarding proper administration and potential side effects.
* Advise patients to drink plenty of clear fluids before and after administration to prevent dehydration.
* Avoid use in patients with risk factors for dehydration or electrolyte imbalance.
* Consider alternative bowel preparations in patients with contraindications or significant risk factors.
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*Disclaimer: This information is intended for healthcare professionals and does not replace consulting the official prescribing information for the specific product being used.*
