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Naloxone (By injection)

Naloxone (nal-OX-one)

There may be other brand names for this medicine.

This medicine is not right for everyone. Do not use it if you had an allergic reaction to naloxone.

This medicine is given as a shot under your skin or into a muscle.
This medicine comes with patient instructions and a training device. You, your home health caregiver, and family members should read the instructions carefully. Ask your doctor if you have any questions.
Do not use the medicine if it is cloudy, discolored, or has large particles in it.
Evzio® is available in 2 dosage strengths: 0.4 milligram (mg)/0.4 milliliter (mL) autoinjector or 2 mg/0.4 mL autoinjector. Zimhi is available in 5 mg/0.5 mL prefilled syringe.
This medicine can only be used one time. Do not remove the safety guard until you are ready to use it.
To use:
- Inject the medicine into the outer thigh, through clothing, if needed. If you are giving this medicine to a child younger than 1 year of age, pinch the thigh while you give the medicine.
- After you give the first dose to the patient, get emergency medical help right away.
- Watch the patient closely. If needed, you may give more doses every 2 to 3 minutes until the patient responds.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

Tell your doctor if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, or heart or blood vessel disease.
This medicine should be given right away after a suspected or known overdose of an opioid (narcotic) medicine. This will help prevent serious breathing problems and severe sleepiness that can lead to death.
The effects of the opioid medicine may last longer than the effects of the naloxone. This means the breathing problems and sleepiness could come back. Always call for emergency help after the first dose of naloxone.
This medicine could cause withdrawal symptoms from the opioid medicine.
Keep all medicine out of the reach of children. Never share your medicine with anyone.

Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Crying more than the usual (in babies)
Diarrhea, nausea, vomiting, stomach cramps
Fast, pounding, or uneven heartbeat, trouble breathing
Fever, runny nose, sneezing, sweating, yawning, goosebumps
Lightheadedness, dizziness, fainting
Seizures, tremors, weakness, feeling restless, nervous, or irritable

Last Updated: 4/23/2024