Nalmefene Injection

What is this medication?

NALMEFENE (NAL muh feen) treats opioid overdose, which causes slow or shallow breathing, severe drowsiness, or trouble staying awake. It belongs to a group of medications called opioid blockers.

This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.

COMMON BRAND NAME(S): Revex

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions:

• Heart disease
• Substance use disorder
• An unusual or allergic reaction to nalmefene, other medications, foods, dyes, or preservatives
• Pregnant or trying to get pregnant
• Breastfeeding

How should I use this medication?

This medication is injected into a vein, under the skin, or into a muscle. It is given by your care team in a hospital or clinic setting.

Talk to your care team about the use of this medication in children. Special care may be needed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.

NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

This does not apply.

What may interact with this medication?

Interactions are not expected.

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

Your condition will be monitored carefully while you are receiving this medication.

This medication quickly reverses the effects of opioids. This may cause withdrawal in some patients. Symptoms may include body aches, sweating, chills, tremors or shaking, restlessness, stomach cramping, diarrhea, yawning, runny nose, increase in blood pressure, and fast or irregular heartbeat. Your care team can help manage these symptoms. Do not take large doses of opioids to stop these effects. This could lead to overdose and death.

What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible:

• Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat

Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):

• Chills
• Dizziness
• Headache
• Irritability
• Nausea
• Vomiting

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Where should I keep my medication?

This medication is given in a hospital or clinic. It will not be stored at home.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.