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.

Continue Learning about Opiate Agonists

Can I use tramadol if I have a history of diabetes?
Stacy Wiegman, PharmDStacy Wiegman, PharmD
Tramadol belongs to a class of drugs called opioid analgesics, which doctors prescribe for the treat...
More Answers
Should opioids be prescribed for all types of pain?
Devi E. Nampiaparampil, MDDevi E. Nampiaparampil, MD
Opioids can be very helpful for acute pain management in the short term, but there are some side eff...
More Answers
Who is at risk for breathing problems caused by opioid medication?
Travis M. Hendry, MDTravis M. Hendry, MD
Opioid therapy can decrease your breathing, especially during sleep. This problem, called respir...
More Answers
What should I tell my doctor before taking an opioid medication?
Dr. Travis M. Hendry, MDDr. Travis M. Hendry, MD
Before you start taking an opioid medication, talk to your doctor and pharmacist. Follow these tips:...
More Answers

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.