For decades, treatment for alcohol use disorder relied almost entirely on therapy and willpower. Today, medicine offers additional tools. Naltrexone is one of several FDA-approved medications that can support recovery from alcohol use disorder — not by replacing therapy, but by working alongside it to reduce cravings and the rewarding pull of alcohol.
This article explains what naltrexone does in the brain, the difference between its oral and injectable forms, when medication-assisted treatment is recommended, how it combines with therapy, and the considerations involved. It is educational only; medication decisions belong to a qualified clinician.
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WHAT NALTREXONE DOES IN THE BRAIN
Naltrexone belongs to a class of medications called opioid antagonists. While that name might seem unrelated to alcohol, the connection lies in the brain’s reward system.
When a person drinks alcohol, part of what makes it pleasurable is the release of natural opioids (endorphins) in the brain, which act on opioid receptors to produce feelings of reward and reinforcement. This reward is part of what drives the cycle of craving and drinking.
Naltrexone blocks these opioid receptors. By doing so, it reduces the rewarding, pleasurable “buzz” that alcohol produces. The effects of this are twofold:
- It can reduce cravings for alcohol, making it easier to resist the urge to drink.
- It can reduce the reinforcement from drinking, so that if a person does drink, the experience is less rewarding — which can help reduce heavy drinking.
In essence, naltrexone turns down the volume on alcohol’s reward signal. It does not make a person sick if they drink (unlike disulfiram), and it does not produce a high of its own. It simply makes alcohol less rewarding and cravings more manageable, creating space for the therapeutic work of recovery to take hold.
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ORAL VS INJECTABLE (VIVITROL)
Naltrexone comes in two main forms, and the choice between them depends on individual circumstances.
| Form | How it’s taken | Key considerations |
| Oral naltrexone | A daily pill | Flexible and easy to start or stop, but depends on the person remembering to take it every day. Daily adherence can be a challenge for some. |
| Extended-release injectable (Vivitrol) | A monthly injection given by a healthcare provider | Removes the need for daily dosing; one injection lasts about a month. This can improve consistency for people who struggle with daily adherence. |
Both forms contain the same active medication and work the same way in the brain. The injectable form’s main advantage is adherence — by removing the daily decision to take a pill, it can help people stay consistent. The oral form’s advantage is flexibility. Which is appropriate depends on the individual, and is a decision for the prescribing clinician.
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WHEN MAT IS RECOMMENDED
Medication-assisted treatment (MAT) — using medication like naltrexone alongside therapy — is not for everyone, but it can be valuable in many cases. A clinician may consider naltrexone when:
- A person experiences strong, persistent cravings that make sobriety difficult
- Previous attempts at recovery through therapy alone have been undermined by cravings or repeated relapse
- The person is motivated and willing to combine medication with therapeutic treatment
- There are no medical contraindications (for example, naltrexone is generally not used in people currently using opioids, as it can precipitate withdrawal)
It is important to understand what MAT is and isn’t. It is not a substitute for the deeper work of recovery, and it is not a “cure in a pill.” It is a tool that can make that deeper work more achievable by easing the biological pull of cravings. Whether it is appropriate is always an individual clinical decision based on a full assessment.
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COMBINING WITH THERAPY
The evidence is clear on one crucial point: naltrexone works best as part of a comprehensive treatment program, not on its own.
Medication can reduce cravings and the reward of drinking, but it does not address the underlying drivers of alcohol use disorder — the emotional pain, trauma, stress, thought patterns, co-occurring conditions, and life circumstances that fuel drinking. Those require therapy.
The combination is powerful precisely because each part supports the other:
- Naltrexone eases cravings, freeing the person to engage in therapy without being constantly pulled toward alcohol.
- Therapy addresses the root causes and builds the skills, insight, and support that sustain long-term recovery.
At a comprehensive residential program like Oceánica, any medication is integrated into a complete treatment model: medically supervised detox where needed, two individual therapy sessions and five group sessions per week, relapse-prevention planning, and whole-person wellness. Medication decisions are made by qualified medical staff as one component of an individualized plan — never in isolation.
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SIDE EFFECTS & CONSIDERATIONS
Like any medication, naltrexone has potential side effects and considerations that must be evaluated by a clinician. Commonly discussed considerations include:
- Possible side effects such as nausea, headache, dizziness, fatigue, or, less commonly, others
- The importance of liver health monitoring, as the medication is processed by the liver
- The critical interaction with opioids: naltrexone blocks opioid receptors, so it should not be used by people currently taking or dependent on opioids, as it can trigger withdrawal, and it affects how opioid pain medications would work
- The need for an appropriate gap after opioid use before starting, to avoid precipitating withdrawal
- That it is one option among several FDA-approved medications for alcohol use disorder (others include acamprosate and disulfiram), each suited to different situations
None of this is something to navigate alone. The role of this article is to explain how naltrexone works in general terms; the decision about whether it is right for any individual — and the management of dosing, monitoring, and side effects — belongs entirely to a qualified healthcare professional who knows the person’s full medical history.
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FREQUENTLY ASKED QUESTIONS
- How does naltrexone help with drinking?
Naltrexone blocks the brain’s opioid receptors, reducing the rewarding effects of alcohol. This can lower cravings and make drinking less reinforcing, helping people reduce or stop drinking, especially when combined with therapy.
- Does naltrexone make you sick if you drink?
No. Unlike disulfiram, naltrexone does not cause a sickness reaction with alcohol. It works by reducing alcohol’s rewarding effects and cravings, not by making drinking unpleasant.
- What’s the difference between the pill and the injection?
Oral naltrexone is a daily pill; Vivitrol is a monthly injection. Both contain the same medication. The injection removes the need for daily dosing, which can help with consistency. The choice is made with a clinician.
- Is naltrexone enough on its own?
No. Naltrexone works best as part of a comprehensive program that includes therapy. It eases cravings, but the underlying causes of alcohol use disorder are addressed through therapeutic treatment.
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SUGGESTED INTERNAL LINKS
- Medication-Assisted Treatment for Alcohol
- Alcohol Use Disorder Treatment: From Diagnosis to Recovery
- Acamprosate (Campral) for Alcohol Cravings
- Alcohol Rehab in Mexico
- Services and Programs at Oceánica
EXTERNAL REFERENCE LINKS
- Oceánica conecta
- SAMHSA — Medications for Substance Use Disorders
- NIAAA — Medications for Alcohol Use Disorder
- FDA — Naltrexone Information
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Oceánica is a CARF-accredited residential treatment center in Mazatlán, Mexico, where any medication is integrated into a complete, individualized treatment program. Medication decisions are made by qualified medical staff. Call (213) 527-3377 or visit oceanica-usa.com. This article is informational and not a substitute for medical advice.
