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## Sodium Phosphate Enema
### Overview
Sodium phosphate enema is a hypertonic saline solution used as a saline laxative for the relief of occasional constipation. It works by drawing water into the colon, which softens stool and stimulates bowel movements.
### Primary Indications
* Relief of occasional constipation.
* Bowel preparation prior to medical procedures (e.g., colonoscopy, sigmoidoscopy).
### Adult Dosing
* **Constipation:** Typically, one 4.5 fl oz (133 mL) enema administered rectally. Do not administer more than one dose in 24 hours.
* **Bowel Preparation:**
* **Evening before procedure:** One 4.5 fl oz (133 mL) enema administered rectally.
* **Morning of procedure (if required by protocol):** An additional dose may be administered 2-6 hours prior to the procedure.
* **Specific protocols may vary.** Always consult local institutional guidelines or the prescribing physician.
### Pediatric Dosing
* **Children 5-11 years:** One 2.25 fl oz (66.5 mL) enema administered rectally. Do not administer more than one dose in 24 hours.
* **Children under 5 years:** Contraindicated.
### Dose Adjustments
* **Renal Impairment:** Use with caution. High doses or frequent use can lead to hyperphosphatemia, hypocalcemia, and acute kidney injury. Contraindicated in patients with severe renal impairment.
* **Hepatic Impairment:** No specific adjustment, but caution is advised due to potential electrolyte imbalances.
* **Elderly:** Use with caution due to increased risk of dehydration and electrolyte disturbances.
### Contraindications
* Congenital or acquired megacolon.
* Bowel obstruction.
* Appendicitis.
* Intestinal perforation.
* Severe rectal inflammation or ulceration.
* Children under 5 years of age.
* Patients with impaired renal function (especially severe impairment).
* Patients with cardiac, hepatic, or renal disease.
* Patients on diuretics or other medications that may affect electrolytes.
* Patients with decreased bowel motility.
### Adverse Effects
* **Common:** Abdominal cramping, bloating, nausea, vomiting, rectal irritation.
* **Serious:**
* **Electrolyte Imbalance:** Hyperphosphatemia, hypocalcemia, hypernatremia, hypokalemia. This can lead to tetany, cardiac arrhythmias, seizures, and kidney damage.
* **Dehydration.**
* **Acute Kidney Injury.**
* **Arrhythmias.**
* **Hypersensitivity reactions.**
### Key Drug Interactions
* **Diuretics:** Increased risk of dehydration and electrolyte imbalance.
* **ACE Inhibitors/ARBs:** May increase risk of hyperkalemia.
* **NSAIDs:** May increase risk of renal impairment.
* **Other laxatives:** Increased risk of dehydration and electrolyte imbalance.
### Monitoring
* Monitor for signs and symptoms of dehydration and electrolyte imbalance (e.g., thirst, dry mouth, decreased urination, dizziness, muscle cramps, confusion, irregular heartbeat).
* Monitor renal function and electrolytes (phosphate, calcium, sodium, potassium) in patients at risk, especially with repeated use or in those with underlying renal or cardiac conditions.
### Clinical Pearls
* Administer slowly and only as directed. Retain for the shortest time possible, but at least 5-10 minutes, before defecation.
* Avoid concurrent use with other laxatives.
* Do not use for more than one week unless directed by a physician.
* Educate patients about the risks of electrolyte imbalance, especially in vulnerable populations.
* The risk of serious toxicity is higher with inappropriate use, such as repeated doses or use in patients with contraindications.
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**Disclaimer:** This information is intended for clinical use and is not a substitute for professional medical advice. Always consult the current prescribing information and your healthcare provider for any medical decisions.
