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How Effective is Naltrexone for Alcohol Addiction?
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How Effective is Naltrexone for Alcohol Addiction?

How Effective is Naltrexone for Alcohol Addiction?
Written by Seth Fletcher on May 1, 2025
Medical editor Victoria Perez Gonzalez
Last update: May 1, 2025

Alcoholism remains a challenging substance use disorder to treat, afflicting millions of individuals around the globe. While behavioural therapies and support groups are basic components of recovery, MAT has assumed increasing focus as an invaluable resource for achieving long-term efficacy. Among these agents, naltrexone has emerged as the clinically most studied drug for diminishing cravings and preventing relapses.

Key Takeaways

  • Naltrexone's Action: Reduces cravings and makes alcohol less rewarding, supporting long-term recovery.
  • Effectiveness: Proven to reduce binge drinking, cravings, and relapse rates when combined with therapy.
  • Dosage Options: Available as a daily pill (50 mg) or monthly injection (Vivitrol), offering flexible treatment.
  • Side Effects: Generally mild (headaches, dizziness, insomnia), with liver function monitoring recommended.
  • Support for Recovery: Works best as part of a broader treatment plan, including therapy and lifestyle changes.

But just how effective is it? This article will look into the rationale of action behind naltrexone for alcohol addiction, scrutinize the recalcitrant pain of treating alcohol use disorder, and analyze who is more likely to benefit from the medication. If you are a healthcare provider, a relative to someone recovering, or are experiencing the rocky road of alcohol treatment yourself, comprehending naltrexone’s role in alcohol use disorder will serve as a clearer lens and pathway of hope.

Naltrexone efficacy

What Is Naltrexone, and How Does It Work?

Naltrexone is an opioid receptor antagonist to blocks the euphoric and sedative effects of alcohol. Unlike disulfiram (Antabuse), which will cause an unpleasant reaction when alcohol is consumed, naltrexone for alcoholism works by attenuating this reward response of the brain to make the act of drinking less pleasurable for a person with alcohol use disorder.

Both the physical craving and the psychological reinforcement associated with alcohol consumption are reduced by this. As time goes by, it allows the patient to better refrain from or decrease the quantity of alcohol consumed. Furthermore, since naltrexone does not cause dependence or have other properties for dependency, it is safe for medical supervision over long periods. Its non-aversive mechanism allows patients to continue functioning comfortably while they adjust their drinking habits. 

Some people might prefer to consume naltrexone for alcohol addiction only during high-risk situations; this is referred to as targeted or “as-needed” use. Evidence shows that both daily and targeted uses can be effective depending on the patient's drinking patterns. Ultimately, naltrexone empowers people with alcohol use disorder to regain control without disrupting their daily routine.

naltrexone alcohol withdrawal

Clinical Effectiveness of Naltrexone for Alcohol Use Disorder

Numerous studies have shown that naltrexone for alcohol addiction can be highly effective, especially when combined with counseling or behavioural therapies. Patients taking naltrexone for alcoholism tend to experience:

Reduced Frequency of Heavy Drinking

Naltrexone proved effective in curtailing binge-drinking frequency and intensity stages through alcohol dependence treatment. By opposing the pleasant effects of alcohol, heavy drinking becomes less reinforcing for the patient. With time, drinking decreases to a quantifiable degree. Clinical studies carried out conclusively demonstrate a reduced number of drinking days among naltrexone-treated patients for alcohol addiction.

Lower Incidence of Relapse

Patients, on naltrexone for alcohol addiction, suffer fewer relapses than those on placebo or no medication control. It reduces incentives for drinking that, in turn, can psychologically reinforce a return to drinking. In the context of therapy, it enhances strategies against relapse, thus proving to be an important option in supporting their long-term recovery. 

Reduced Craving

The modulation of dopaminergic activity in craving works by naltrexone in a very prominent way. Patients say that the urge to drink is not as strong as it used to be — a claim made from the onset of treatment to a few weeks after. This craving control could revolutionize recovery for people who have had setbacks with multiple quit attempts in the past. The advantage becomes especially potent when combined with cognitive behavioural therapy.

naltrexone for alcohol use disorder

Improved Retention in Overall Treatment

Retention in alcohol treatment programs constitutes a significant criterion for long-term recovery success. Research reveals that patients administered naltrexone for the treatment of alcohol dependence have higher rates of retention in therapy and completion of treatment plans. Reduction in cravings and alcohol-related rewards makes it easier for patients to stay motivated; consequently, this could lead to improved outcomes both in treatment and after formal discharge.

The typical naltrexone dose for alcohol is 50 mg per day when taken orally. A long-acting injectable form (Vivitrol) is also available, administered once a month, which can be beneficial for individuals who struggle with daily medication adherence.

How Long Does Naltrexone Block Alcohol?

Naltrexone is an extremely potent medication for alcoholism that can act within an hour after a single oral dose, blocking pleasurable alcohol effects for about a day. The longer-acting injectable forms adequately block alcohol effects from 28 to 30 days. The blocking effect of naltrexone for alcohol addiction reduces drinking urges, particularly in high-risk situations. Many people report that it helps to consciously consider drinking choices, knowing that alcohol will not provide the rewards anticipated. 

For the alcohol-dependent person, this sense of control may be powerful in social gatherings, stressful times, and moments of temptation. The most effective administration of naltrexone is just before situations that are likely to trigger drinking. With repeated use, this may counter the psychological association of alcohol with reward. Hence, naltrexone supports abstinence along with aiding very long-term behavioural change.

Naltrexone vs Naloxone: What Is the Difference?

Naltrexone is a long-term treatment for alcohol use disorder, not a once-off naloxone event. Naloxone is used in emergencies for opioid overdoses, but people have been exploring whether naloxone can also treat people drinking too much. It works on rewiring the brain's reward response to drugs over years of treatment, making it apt for chronic conditions such as alcohol use disorder. Naloxone, on the other hand, acts very quickly but for only a short time, since it is intended to treat potentially life-threatening respiratory depression. Due to these differences, the two drugs have very different clinical roles. Naltrexone is the only drug proven to reduce craving and prevent relapse for individuals dependent on alcohol.

While they are both antagonists of opioids, the comparison of naltrexone versus naloxone speaks very much to differences. Naltrexone is for long-term management of alcohol addiction; it is used daily or once a month. Naloxone is an emergency medication to reverse an opioid overdose. Some studies look at the use of naloxone for alcohol; however, it is currently not approved for use in alcohol treatment.

Alcohol addiction medication options

It alters the brain’s reward response over time, which makes it suitable for chronic conditions like alcohol use disorder. Naloxone is, however, quick in terms of its onset and has a narrow duration of action since it is meant to counter life-threatening respiratory depression. For these reasons, the two have very dissimilar uses in clinical practice, since only naltrexone for alcohol addiction shows promising efficacy in the reduction of cravings and relapse prevention among those dependent on alcohol.

Addressing Naltrexone Alcohol Withdrawal: Does Naltrexone Help?

Naltrexone is not to be confused with managing other acute withdrawal symptoms like seizures, tremors, or anxiety. It should not be used from the beginning of naltrexone alcohol withdrawal, since current levels of opioids in the system make it even more dangerous. Alcohol patients should be abstinent from both alcohol and opioids for at least 7-10 days to initiate naltrexone for treating alcohol use disorder. 

However, it is after the detoxification that naltrexone for alcohol addiction is associated with long-term improvements in outcome. It can be introduced into a relapse prevention strategy, thereby ensuring continued support for the patient from the point of detoxification. Clinical guidelines advise initiating naltrexone with counseling or cognitive-behavioural therapy. The support to resist drinking is helpful, as it directs the brain’s reward system towards changing behaviour. This helps sustain those who have had repeated episodes of cravings and relapses after detoxification.

Naltrexone Side Effects Alcohol, and Safety

Like any medication, naltrexone side effects alcohol might include:

Headache 

Some individuals report mild to moderate headaches in the early weeks of initiation. It can usually be relieved by drinking fluids and taking the drug with meals.

naltrexone for alcohol addiction

Dizziness

Dizziness may arise as the body adjusts to the medication and, in some cases, when the patient rises quickly. However, if such experiences persist, it is important to check with a healthcare provider for evaluation of dosage or timing.

The tired, sluggish feeling can sometimes accompany a person during the early days of treatment. It is best to change the daily routines and allow the body time to adapt.

Sleeplessness

Some patients may complain that they are having difficulty falling asleep or maintaining sleep for the first few weeks. Keeping a regular schedule and avoiding stimulants in the evening will help.

Anxiety

An increase in anxiety is possible in some patients, especially during the start of treatment, but this lasts for a short time and then improves as your body adjusts to the medicine.

In rare cases, liver function may be affected, especially at higher doses. Patients should undergo regular liver function tests while on naltrexone for alcohol use disorder. Despite these potential side effects, the medication is generally well tolerated. The benefits of reduced cravings and improved abstinence often outweigh these manageable symptoms.

Is Naltrexone Right for You?

If naltrexone is under consideration for alcohol, one should contact a trained physician. Naltrexone works best when it is a part of a treatment plan involving therapy, peer support, and lifestyle changes. It won’t work in the same way for everyone among many; however, it does indeed provide many with a strong base for recovery. Your provider will take your history, orientation towards current substance use, and drug interactions into consideration before therapy. 

They can also assist in assessing the most effective naltrexone dosage regarding alcohol-use disorder and tracking treatment progression. Following your treatment process may heighten success by ensuring any side effects or hurdles faced will be addressed on time. Thus, with the right set of help, naltrexone proves to be a useful tool for the establishment and maintenance of sobriety in the long term.

addiction treatment

Final Thoughts

Naltrexone for alcohol abuse uses a scientific medication-assisted approach to treating alcohol use disorder. It reduces cravings and stops relapses, being a helpful tool for both patients and clinicians in seeking long-term sobriety. This does not help with withdrawal symptoms, nor is it the answer for every patient with an alcohol problem. Still, it has been shown to reduce alcohol consumption well. Understand which medications have been cited for recovery; compare such choices as naltrexone vs naloxone, in addition to discussing the right naltrexone dose for alcohol with an expert. New applications and overwhelming sure that naltrexone for alcohol offers a great step forward to a healthier, sober life.

FAQ

What is Naltrexone primarily used for?

Naltrexone is one of the therapies for alcohol use disorder: it reduces cravings and helps prevent relapses by blocking the pleasurable effects of alcohol in the brain. Naltrexone may also be used for the treatment of opioid dependence.

In what way does Naltrexone work against alcohol addiction?

The Naltrexone works by the blockage of the opioid receptors in the brain, thereby reducing the euphoric and sedative effects of alcohol. This makes the drinking not so enjoyable, thus helping to reduce the physical and psychological craving that accompanies alcohol use disorder.

How long does it take Naltrexone to leave the body?

Usually, Naltrexone works within an hour after oral dosage, with its action terminable in about 24 hours. The long-acting injectable form (Vivitrol) opposes the effects of alcohol within 28 to 30 days.

Can Naltrexone help with the withdrawal of alcohol?

Naltrexone is not intended to treat acute withdrawal symptoms, including seizures or anxiety, due to alcohol. Once the detoxification stage has been completed, and the person has refrained from alcohol and opioids for 7-10 days, then it can be administered.

What are some side effects of Naltrexone?

Side effects of Naltrexone vary and may include headache, dizziness, fatigue, insomnia, and anxiety. Hepatic impairment is an uncommon event. Regular liver function tests are recommended while on treatment.

Is Naltrexone effective for all?

Naltrexone is effective for many people with alcohol-use disorder undergoing therapy and support. However, efficacy may vary; it is best suited within an overall treatment plan inclusive of behavioral therapy and lifestyle modifications.

Certified Addiction Counsellor

Seth brings many years of professional experience working the front lines of addiction in both the government and privatized sectors.

Dr. Victoria Perez Gonzalez is a highly respected doctor who specializes in the brain and mental health. She has extensive knowledge and experience in this field.

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