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# Hepamerz* (l-Ornithine l-Aspartate)
## Overview
Hepamerz is a combination of two amino acids, l-ornithine and l-aspartate. It is thought to reduce elevated ammonia levels in the blood, primarily by stimulating the synthesis of urea in the liver and glutamine in peripheral tissues.
## Primary Indications
* Treatment of hyperammonemia associated with liver disease (e.g., hepatic encephalopathy).
## Adult Dosing
* **Oral:** Typically 6-18 grams per day, divided into 3 doses. Specific dosing may vary based on the severity of hyperammonemia and hepatic dysfunction.
* **Intravenous (IV):** Commonly administered as a continuous infusion. A typical dose is 5-10 grams per day, with a maximum of 20 grams per day. Dosing should be guided by ammonia levels and clinical response.
## Pediatric Dosing
* Pediatric dosing is not well-established and should be determined by a specialist. Doses used in case series have ranged from 100-500 mg/kg/day divided into multiple doses.
## Dose Adjustments
* No specific dose adjustments are typically required for renal or hepatic impairment, as the drug is intended for use in patients with liver dysfunction. However, careful monitoring is essential.
## Contraindications
* Severe hypersensitivity to l-ornithine or l-aspartate.
* Severe kidney disease (creatinine clearance < 30 mL/min) is often cited as a precaution, though its clinical significance in this context is debated.
## Adverse Effects
* Gastrointestinal: Nausea, vomiting, diarrhea, abdominal pain.
* Injection site reactions (for IV formulation): Pain, irritation, phlebitis.
* Rarely: Allergic reactions.
## Key Drug Interactions
* Limited significant drug interactions are reported for oral or IV l-ornithine l-aspartate.
## Monitoring
* Serum ammonia levels: Monitor closely to assess efficacy and guide dosing.
* Renal function: Monitor electrolytes and renal parameters.
* Signs and symptoms of hepatic encephalopathy: Assess clinical status.
## Clinical Pearls
* Hepamerz is most effective when ammonia levels are elevated due to impaired liver function.
* The oral formulation may have variable absorption.
* For IV administration, dilution in a compatible IV fluid (e.g., dextrose 5% or 0.9% sodium chloride) is usually required.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and relevant literature for the most up-to-date and comprehensive guidance. Dosing and recommendations may vary based on individual patient factors and local protocols.*
