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Naltrexone Use in Addiction Treatment

Does Naltrexone Treat Withdrawal?

Naltrexone does not treat withdrawal. Unlike some other medications that are used to manage symptoms during detox, naltrexone should not be taken by someone still acutely withdrawing from opioids and is best utilized in someone who has already attempted to abstain from alcohol for several days or has already gone through a medically assisted alcohol detox.

Naltrexone is used for the post-detox treatment of opioid and alcohol addiction, as it blocks the subjective high from opioids and diminishes some of the rewards associated with drinking. It is available in tablet form or as an extended-release injection (Vivitrol).1,2 When taken too soon in someone with opioid dependence, naltrexone can, in fact, trigger or worsen withdrawal symptoms.2 Studies have documented precipitated withdrawal cases among people opioid-dependent individuals who start naltrexone without fully detoxing off of opioids first.1

It is recommended that people who are dependent on opioids, such as heroin or morphine stop their use of opioids at least 7 to 10 days before you begin a naltrexone medication. Those making the switch from a methadone maintenance regimen or other medically-assisted treatment scenario involving methadone to naltrexone must be completely detoxed from opioids first.3

Like all addiction medication, naltrexone should be used as a component of more comprehensive recovery efforts that include behavioral therapy and psychosocial support to improve treatment outcomes.4 

How Does It Work?

Naltrexone is a medication approved by the Food and Drug Administration (FDA) to treat opioid use disorders and alcohol use disorders.

It is one of several types of medications used in the treatment of opioid addiction. The other two are methadone, a full opioid receptor agonist, and buprenorphine, a partial agonist. Both bind to and activate the brain's opioid receptors to different degrees to alleviate some of the unpleasant opioid withdrawal symptoms and relieve cravings.

Naltrexone differs from these two in that it is an opioid antagonist, which means that it inhibits the activation of opioid receptors in the brain.3 If you use opioids, it will block the euphoria and sedation you would normally feel if you were not taking naltrexone.

Medications used for alcohol withdrawalThis opioid antagonizing effect of naltrexone also helps to limit some of the rewarding effects associated with alcohol and, in doing so, decreases continued drinking behavior and reduces the likelihood of relapse in those dedicated to recovering from compulsive alcohol use. There is some evidence that naltrexone also helps to reduce alcohol cravings.5 A consistent naltrexone regimen may diminish some of the motivation to continue using either opioids or alcohol.3

Again, naltrexone is not used as an opioid or alcohol detox medication. As mentioned, naltrexone can initiate or worsen an already severe opioid withdrawal experience when taken prematurely. Instead, naltrexone is used to help people stay clean and sober once the withdrawal phase of treatment has ended.6 

How Is It Administered?

Naltrexone is available in a pill form, or as a long-acting injectable version.6

The pill form is taken orally every day. Because the pill needs to be taken regularly to be effective, compliance to treatment can be an issue; in fact, doctors note that failure to take the medication is common among their patients.

The once-a-month naltrexone injection, Vivitrol, makes it much easier to adhere to your medication regimen and is a great option for people who forget to, or simply don't want to, take a pill several times per week.7

Does It Reduce Cravings?

You should not expect naltrexone to completely remove all cravings or urges you have to use alcohol or opioids. However, you may still want to use them for any number of reasons. There is evidence that, because naltrexone reduces the reward and makes abusing opioids or alcohol a less pleasant experience, it may eventually decrease a person's cravings and desire to use these drugs.3

Again, naltrexone is not like methadone in that it doesn't produce opioid effects in your brain to help lower your cravings; rather, it prevents alcohol or opioids from activating your opioid receptors in order to prevent feeling the pleasurable effects of the drugs. The idea behind naltrexone is that without the euphoric high you're used to, the drugs won't hold the same appeal. Through its opioid antagonist action, naltrexone:8

  1. Helps individuals stay away from using alcohol or opioids.
  2. Reduces a person’s desire to drink alcohol.
  3. Helps prevent relapse.

Relapse risks may be extremely high among people who have recently completed a short course of residential treatment, but medications like injectable naltrexone can help protect against relapsing back to opioid abuse.9

In a study of people incarcerated within the U.S. criminal system, researchers found that those who were given Vivitrol reported lower rates of opioid relapse than those who didn’t receive the medication.10

What Should I Know Before Taking Naltrexone?

You need to wait until the appropriate time to begin taking naltrexone. If you are withdrawing in a medical detox, your treatment team will know when to begin your naltrexone treatment. Otherwise, your doctor can advise you when to begin taking the drug and will monitor your treatment. It's important not to take any more or less naltrexone than your physician has prescribed.2

Other things to consider when taking naltrexone include the following:11

  • Missing doses of naltrexone can increase your risk of relapse. If you miss a dose do not double up on your next dose – just take it as soon as you remember.
  • You should not stop taking naltrexone until your doctor has communicated to you that it is time to cease your medication regime.
  • While taking the medication, avoid alcohol and opioid medications.
  • If you suffer from depression or suicidal thoughts, share that with your doctor. If you feel like you may harm yourself or others, call 9-1-1 or visit your closest emergency room.

During a period of abstinence from opioids, your tolerance may decrease, and you'll be more sensitive to opioids if you take them again. This means that even lower doses than you took before starting treatment could cause you to fatally overdose.1 Because of this, it is extremely important that you are connected to a comprehensive treatment program that includes therapy and professional support so you can seek help if you feel yourself slipping into a potential relapse.3 

Who Should Use It?

The importance of specialized care when seeking addiction treatment.If you are using naltrexone, you should not continue drinking or using drugs.3 Naltrexone alone is not enough to treat addiction. You should use this medication if you are committed to ending your substance use and can engage in a treatment regimen that incorporates behavioral therapeutic approaches in addition to medication.

Your treatment team can help you approach your addiction from numerous angles and can facilitate participation in activities such as group or individual counseling, life skills training, and more so that you are as prepared as possible to live in recovery and face the challenges that come with staying abstinent.6 Medication is only a small part of a more comprehensive recovery plan.

Who Should NOT Use It?

Naltrexone is widely used in alcohol and opioid addiction treatment; however, it may not be safe for those with:8

  • Acute hepatitis.
  • Liver failure.
  • Chronic pain (and who are using painkillers).

Naltrexone is not appropriate for everyone. You should avoid using this drug and ask your doctor for any alternatives if:2

  • You are currently in withdrawal.
  • You are still using heroin or other opioid drugs or still drinking alcohol.

Naltrexone might not be safe for pregnant or breastfeeding women. Learn more below.

What Are the Side Effects?

What naltrexone is used for.Common side effects of naltrexone include:3

  • Diarrhea.
  • Headache.
  • Sleep problems.
  • Stomach upset.
  • Joint pain.
  • Nervousness.

If you are prescribed naltrexone as part of your treatment and you are experiencing side effects, speak to your doctor about adjusting your dose or changing your medication.

In large doses, naltrexone use may cause liver damage. Symptoms include:2

  • Loss of appetite.
  • Dark urine.
  • Feeling very tired.
  • Unusual bleeding.
  • Bruising.
  • Stomach pain for more than a few days.
  • Yellowing of the skin or eyes.

If you notice these symptoms, seek medical attention right away.

Can Naltrexone Be Used During Pregnancy?

Researchers are still investigating whether naltrexone is safe to use during pregnancy. However, recent studies have found that naltrexone may be an effective treatment approach in managing opioid dependence in pregnant women. If a woman is pregnant, she will likely require a specialized detox, and naltrexone may be a promising addition to an opioid-dependent woman’s treatment options.12

One study found that when opioid-dependent pregnant women were treated with naltrexone, their babies had shorter hospital stays and lower rates of neonatal abstinence syndrome compared to newborns whose mothers were given buprenorphine or methadone. Although this non-controlled study had certain limitations, the findings point to the need for further research in the field.12

A handful of studies conducted on animals who were given very high doses of naltrexone showed that when the animal fetus is exposed to the medication, it can cause physical and behavioral defects including miscarriage, high birth weight, and longer body length. Because these studies were conducted with very high doses of naltrexone (much higher than the human dose), researchers were unable to generalize these effects to a human fetus.12

When considering the risks of opioid medications on mother and child, it's important to also weigh the risks of continuing to abuse opioids such as heroin. Continued opioid misuse during pregnancy can lead to a number of consequences for a baby, including:12

  • Stillbirth.
  • Miscarriage.
  • Neonatal abstinence syndrome.
  • Preterm labor.
  • Fetal convulsions.

It is important that if you are pregnant and using opioids that you get the help you need. This may not include naltrexone, since it's still being studied; you may be offered methadone or buprenorphine and should also receive therapy. There are professional treatment programs available to help you safely stop using opioids and prevent further harm to you and your baby.12

Naltrexone Information at a Glance2,13,14
Medication Name, Costs Class of Medicine
  • Generic Name: Naltrexone
  • Brand Name: Vivitrol
  • Mechanism of Action: Opioid antagonist
  • Used to Treat Addiction? Yes
  • Function or Use at Low Dose: Used to lessen cravings for alcohol and decrease the euphoria associated with alcohol and opioids.
Form, Intake and Dosage Interactions and Complications
  • Drug Forms: Oral tablet, extended-release suspension for intramuscular (IM) injection
  • Administration Routes: Oral or (IM)
  • Dosing: 25 mg to 50 mg PO, daily or 380 mg IM, q4 weeks depending on the form.
  • Contraindications: Acute hepatitis or liver failure, concomitant opioid use
Effects and Adverse Reactions Substance Abuse
  • Short-Term: Headache, dizziness, nervousness, fatigue, restlessness, insomnia, anxiety, nausea, irritability, rash, joint pain
  • Long-Term: Liver damage
  • Risk of Substance Abuse: None

Naltrexone Withdrawal, Doctors, and Treatment

Depade, ReVia, and Vivitrol withdrawal treatments offer recovering alcoholics an increased chance for maintaining sobriety over an extended period of time. Approved by the U.S. Food and Drug Administration for the treatment of alcohol and opioid dependence, these medications are all forms of naltrexone. These medications are only available with a doctor's prescription.

Naltrexone Use in Addiction Treatment 1An opiate antagonist, naltrexone affects the pleasure centers in your brain. While scientists are not completely certain about the manner in which naltrexone affects alcohol dependence, they believe that the medication blocks the feeling of a high that might prompt an alcoholic to use alcohol. In a study published in The American Journal of Medicine, researchers found that naltrexone treatment along with simple counseling techniques led to a significant increase in the number of days the individuals remained alcohol-free. This combination also led to a significant decrease in the number of drinks consumed.

Generic naltrexone and its brand-name equivalents help with the physical component of alcohol addiction. Naltrexone or ReVia treatment might help reduce your cravings for alcohol. It does not, however, change your body's response to alcohol. You can still become impaired if you drink too much. Because these drugs do not cause physical dependence, you will not have to go through naltrexone or Vivitrol withdrawal when you stop taking the medication.

If you or someone you love wants to stop drinking, naltrexone might be one part of a successful treatment program. If you have questions, please call 1-888-935-1318Who Answers?. We are available 24/7 to help answer your questions about naltrexone. We can even help locate Vivitrol doctors in your part of the country.

Vivitrol Vs. ReVia Vs. Depade

Vivitrol, ReVia, and Depade are all forms of naltrexone. Revia and Depade are two different brand names of naltrexone tablets. Both brands come in 50-mg. tablets, and there is no significant difference between the two different brands. Vivitrol is an injectable form of naltrexone. If your doctor prescribes Vivitrol, a healthcare professional will inject the extended-release formula into your buttocks once per month.

Because ReVia and Depade are tablets that must be taken at least once daily, the risk associated with these products is missed doses. If your doctor prescribes ReVia or Depade, it might be helpful to recruit a friend or loved one to help you remember to take your medication. Repeatedly missing doses might lessen the effectiveness of the Depade or ReVia treatment.

With Vivitrol, doctors can ensure that you take the precise dose at the appropriate time. Because you must visit a doctor's office, hospital, or clinic on a monthly basis, this form of naltrexone is not ideal for everyone. If you have questions about the type of treatment that is right for you, you can call our confidential hotline at 1-888-935-1318Who Answers?.

Choosing the Best Alcohol Detox Medication

Naltrexone Use in Addiction Treatment 2Choosing the right alcohol detox medication is an important decision for anyone who wants to stop abusing alcohol. Unlike other medications such as disulfiram, naltrexone will not make you ill if you drink alcohol. This is true of generic naltrexone as well as of brand-name versions of the medication. If you have questions about the type of medication that is right for you or your loved one, we would be happy to help guide you. Please call 1-888-935-1318Who Answers? for more information.

When considering your options for alcohol detox, remember that medication is one step of the recovery process. Experts advise that you use these medications in conjunction with counseling in order to have the best chance for success. Naltrexone, ReVia, Depade, and Vivitrol withdrawal treatment can be an important component of a recovery and rehabilitation program.



  1. Iovcheva, M., Zlateva, S., & Asparuhova, M. (2007). Precipitated withdrawal reaction to opiates in cases of improper use of naltrexone.Addict Biol1, 75-77.
  2. U.S. National Library of Medicine. (2017). Naltrexone.
  3. Substance Abuse and Mental Health Services Administration (SAMHSA). (2016). What is Naltrexone?
  4. Krupitsky, E., Nunes, E. V., Ling, W., Illeperuma, A., Gastfriend, D. R., & Silverman, B. L. (2011). Injectable extended-release naltrexone for opioid dependence: a double-blind, placebo-controlled, multicentre randomized trial. The Lancet377(9776), 1506-1513.
  5. Amy W. Helstrom, Frederick C. Blow, Valerie Slaymaker, Henry R. Kranzler, Shirley Leong, David Oslin. (2016). Reductions in Alcohol Craving Following Naltrexone Treatment for Heavy Drinking, Alcohol and Alcoholism, 51(5), 562–566. 
  6. Substance Abuse and Mental Health Services Administration (SAMHSA). (2012). The Facts About Naltrexone for Treatment of Opioid Addiction.
  7. National Institute on Drug Abuse. (2018). Opioid Addiction.
  8. National Institute on Alcohol Abuse and Alcoholism. (n.d.). Naltrexone.
  9. Nunes, E. V., Gordon, M., Friedmann, P. D., Fishman, M. J., Lee, J. D., Chen, D. T., ... & O'Brien, C. P. (2018). Relapse to opioid use disorder after inpatient treatment: Protective effect of injection naltrexone. Journal of substance abuse treatment85, 49-55.
  10. Lee, J. D., Friedmann, P. D., Kinlock, T. W., Nunes, E. V., Boney, T. Y., Hoskinson Jr, R. A., ... & Gordon, M. (2016). Extended-release naltrexone to prevent opioid relapse in criminal justice offenders.New England journal of medicine374(13), 1232-1242.
  11. National Alliance on Mental Illness. (n.d.). Naltrexone (ReVia).
  12. National Institute on Drug Abuse. (2018). Could Naltrexone Be Used to Treat Pregnant Women with Opioid Addiction?
  13. DrugBank. (2018). Naltrexone.
  14. Food and Drug Administration. (2010). Vivitrol.