Generic Name:

naltrexone, Injectable Suspension

All Brands

  • Vivitrol
SECTION 1 of 5

Highlights for naltrexone

Injectable Suspension
NALTREXONE (nal TREX one) is used to treat certain types of drug dependence.
This drug also comes in other forms, including Oral tablet
3 4 5
Talk to your healthcare provider if you have any of these conditions.
Know what to watch for and get tips for reducing your risks while taking this drug.
SECTION 2 of 5

naltrexone Side Effects

Injectable Suspension

Side effects that you should report to your doctor or health care professional as soon as possible:

  • allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
  • breathing problems
  • dark urine
  • depressed mood
  • general ill feeling or flu-like symptoms
  • injection site problems: blisters, dark scab, hard area, lumps, intense pain, open wound, or large area of swelling
  • light-colored stools
  • right upper belly pain
  • suicidal thoughts or other mood changes
  • unusual bleeding or bruising
  • unusually weak or tired
  • yellowing of the eyes or skin
  • vomiting

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

  • dizziness
  • headache
  • irritation, sting, or redness where injected right after injection
  • loss of appetite
  • nausea
  • tiredness
SECTION 3 of 5

naltrexone May Interact with Other Medications

Injectable Suspension

Do not take this medicine with any of the following medications:

  • medicines for pain like pentazocine, buprenorphine, butorphanol, nalbuphine, oxycodone, and morphine
Disclaimer: Our goal is to provide you with the most relevant and current information. However, because drugs interact differently in each person, we cannot guarantee that this information includes all possible interactions. This information is not a substitute for medical advice. Always speak with your healthcare provider about possible interactions with all prescription drugs, vitamins, herbs and supplements, and over-the-counter drugs that you are taking.
SECTION 4 of 5

How to Use naltrexone

Injectable Suspension

The medicine is for injection into a muscle. It is given by a health care professional in a hospital or clinic setting.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.

A special MedGuide will be given to you by the pharmacist with each prescription and refill. Be sure to read this information carefully each time.

What should I tell my health care provider before I take this medicine?

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

  • bleeding problem like hemophilia
  • if you frequently drink alcohol containing drinks
  • kidney disease
  • liver disease
  • low platelet count
  • take medicines that treat or prevent blood clots
  • take narcotic medicines for pain or addiction
  • use illegal or street drugs
  • an unusual or allergic reaction to naltrexone, other medicines, carboxymethylcellulose, foods, dyes, or preservatives
  • pregnant or trying to get pregnant
  • breast-feeding
What if I miss a dose?

It is important not to miss your dose. Call your doctor or health care professional if you are unable to keep an appointment.

What should I watch for while using this medicine?

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

Visit your doctor or health care professional regularly. It is important to attend any counseling or support groups that your doctor or health care professional recommends. Attending these sessions while you are taking this medicine will help you overcome your dependence on alcohol or narcotics (opioids). Never try to overcome the effects of the medicine by taking large amounts of narcotics (opioids) because this can cause severe problems including death. Also, you may be more sensitive to lower doses of opioids after you stop taking this medicine.

If you are going to have surgery, tell your doctor or health care professional that you are taking this medicine.

Do not treat yourself for coughs, colds, pain, or diarrhea. Ask your doctor or health care professional for advice. Some of the ingredients may interact with this medicine and cause side effects.

Wear a medical ID bracelet or chain, and carry a card that describes your disease and details of your medicine and dosage times.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.

Where should I keep my medicine?

This drug is given in a hospital or clinic and will not be stored at home.

SECTION 5 of 5

How Much Does naltrexone Cost?

Injectable Suspension

We've partnered with GoodRx so you can compare prices, find discounts and save up to 80% on your next prescription. Check out the low coupon prices below — no insurance required.

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Lowest price for naltrexone

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Kroger Pharmacy $44.34
These prices represent the lowest priced national pharmacies for naltrexone on GoodRx. They may be lower than your insurance.

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These prices represent the lowest priced national pharmacies for naltrexone on GoodRx. They may be lower than your insurance.

Last Updated: October 13, 2010

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