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What are the side effects of nalmefene?

You may have an allergic reaction to nalmefene requiring emergency medical attention. Symptoms of an allergic reaction include: itching, hives or skin rash; difficulty breathing; and swelling of your face, lips, tongue or throat. The following side effects associated with using nalmefene require prompt medical attention: extreme drowsiness; stomach cramps; weak or shallow breathing; chest pain or fluttering in your chest; pain that was controlled by narcotic pain medicine; high blood pressure; seizures; and feeling like you might pass out. Other side effects are generally minor and only require medical attention if they persist or disrupt your daily life. These include: nausea, vomiting, diarrhea and stomach pain; muscle or joint pain; fever, sweating or chills; runny nose; trembling; weakness; and feeling, irritable, anxious, restless or depressed.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.