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FDA Approves First Nalmefene Hydrochloride Auto-Injector to Reverse Opioid Overdose
The U.S. Food and Drug Administration approved Zurnai, the first nalmefene hydrochloride auto-injector for the emergency treatment of known or suspected opioid overdose in adults and pediatric patients 12 years of age and older. The agency approved the first nasal spray formulation of nalmefene in May 2023.
Drug overdose persists as a major public health issue in the U.S., with more than 107,000 reported fatal overdoses occurring in 2023, primarily driven by synthetic opioids like illicit fentanyl. Nalmefene and naloxone are two available options to reverse opioid overdose. The FDA has worked to increase availability and accessibility of both options to encourage harm reduction and reduce overdose death.
Nalmefene is an opioid receptor antagonist which is used to treat acute opioid overdose. If nalmefene is administered quickly, it can reverse the effects of opioid overdose, including respiratory depression, sedation and low blood pressure (hypotension). The newly approved product delivers 1.5 milligrams (mg) of nalmefene under the skin (subcutaneous) or into muscle (intramuscular). Zurnai is a single-dose, pre-filled auto-injector and is available only by prescription.
The use of nalmefene hydrochloride in patients who are opioid-dependent may result in opioid withdrawal characterized by the following signs and symptoms: body aches, diarrhea, fast heart rate (tachycardia), fever, runny nose, sneezing, goosebumps (piloerection), sweating, yawning, nausea or vomiting, nervousness, restlessness or irritability, shivering or trembling, abdominal cramps, weakness and increased blood pressure.
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