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Nalmefene HCl injection

Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.





This medication is used in the treatment of certain drug overdose situations.

How To Use

This medication is administered by injection by a health care professional. It is used under close medical supervision so the dose can be adjusted based on your condition and response.

Side Effects

This medication is generally well tolerated. Nausea, dizziness, fever, headache, chills or muscle aches have been reported. If these effects continue or become bothersome, inform your doctor. Notify your doctor if you develop: vomiting, sweating, tremors, breathing trouble, mental confusion, rapid pounding/irregular heartbeat. If you notice other effects not listed above, contact your doctor or pharmacist.


Tell your doctor if you have: heart disease, been taking pain relievers for more than 2 weeks, allergies. This medication should be used only if clearly needed during pregnancy or while breast-feeding. Discuss the risks and benefits with your doctor.

Drug Interactions

Tell your doctor of any over-the-counter or prescription medication you may take including: narcotic pain medication. Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately.


This medication can cause withdrawal symptoms in persons addicted to narcotic pain relievers.

Missed Dose

This medication is not used on a routine basis.


Store at room temperature between 59 and 86 degrees F (15 to 30 degrees C) as directed. Keep this and all medication out of the reach of children.