A monthly injection or a daily tablet can be a meaningful part of recovery, but medication works best when it is chosen carefully and paired with consistent medical support. Vivitrol / naltrexone for alcohol and opioid use may help some people reduce drinking or avoid returning to opioid use, yet it is not the right treatment for every person or every stage of recovery.
The first step is a private conversation with a clinician who can review current substance use, medications, medical history, treatment goals, and safety needs. There is no one-size-fits-all path. A plan should make room for what is medically appropriate and what a patient can realistically maintain.
How naltrexone works for alcohol and opioid use
Naltrexone is a prescription medication that blocks opioid receptors in the brain. These receptors are involved in the effects of opioid drugs and also play a role in the rewarding effects of alcohol for some people.
For alcohol use disorder, naltrexone may reduce cravings and help lessen the urge to keep drinking after starting. Some patients notice fewer heavy-drinking days; others find that it supports their goal of abstaining from alcohol. Results vary, and medication is not a test of willpower. It is one tool that can make change more manageable.
For opioid use disorder, naltrexone blocks the effects of opioids. If someone takes an opioid while naltrexone is active, they generally will not experience the expected opioid effect. This can help protect against relapse after a person has completed opioid withdrawal and is no longer physically dependent on opioids.
Naltrexone is not an opioid, and it does not cause physical dependence. It is also different from medications such as buprenorphine or methadone, which work through opioid receptors in a different way. The best option depends on a person’s current opioid use, withdrawal risk, prior treatment experience, medical needs, and preferences.
Vivitrol / naltrexone for alcohol and opioid use: the options
Naltrexone is available as an oral tablet and as Vivitrol, a long-acting injection given by a healthcare professional about once a month. Both contain naltrexone, but the right choice often comes down to daily routine, access to appointments, and clinical safety.
Oral naltrexone is usually taken once a day. It can be a practical option for a patient who prefers a medication that can be stopped more quickly if side effects occur or if opioid pain treatment becomes necessary. It does require regular daily use, which can be challenging during a busy or stressful week.
Vivitrol can be helpful for someone who does not want to remember a daily pill or who values the consistency of monthly dosing. The injection must be administered by a trained clinician, typically in the muscle of the buttock. Because it remains active for weeks, it cannot be removed once given. That longer duration is a benefit for adherence, but it also requires thoughtful planning around any future need for opioid pain medication.
Neither option should be chosen solely because it seems easier. A clinician can help weigh convenience against flexibility and make sure the medication fits the patient’s treatment goals.
Who may be a good candidate?
Adults with alcohol use disorder may be candidates for naltrexone if they want support reducing or stopping alcohol use and do not have medical reasons to avoid the medication. A person does not need to wait until their situation has become a crisis to ask for help. Early care can prevent alcohol-related health problems from becoming more serious.
For opioid use disorder, timing is especially important. A patient must be fully off opioids before beginning naltrexone. Starting it too soon can trigger sudden, severe withdrawal because naltrexone pushes opioids off the receptors. This is called precipitated withdrawal, and it can require urgent medical care.
The opioid-free period differs from person to person. It may be longer for people who have used long-acting opioids, medications used to treat opioid use disorder, or fentanyl. A clinician may use a careful history, testing, and other clinical steps to determine whether it is safe to start. Never begin naltrexone after recent opioid use without medical guidance.
A full medication review is also essential. Naltrexone may not be appropriate for someone who needs opioid medication for ongoing pain treatment, has an allergy to the medicine, or has certain liver conditions. Pregnancy, breastfeeding, and other individual health circumstances also deserve a personalized discussion.
Safety points that deserve attention
Naltrexone is generally well tolerated by many patients, but it can cause side effects. Oral naltrexone may cause nausea, stomach discomfort, headache, dizziness, fatigue, or sleep changes. Vivitrol may cause these effects as well as soreness, swelling, or a reaction at the injection site. Severe injection-site pain, skin changes, or an open wound after an injection should be evaluated promptly.
Because the liver processes naltrexone, clinicians may check liver function before treatment and during care when appropriate. Patients should report symptoms such as unusual tiredness, dark urine, yellowing of the skin or eyes, or persistent upper abdominal pain.
There is another safety issue that patients and families should understand clearly: do not try to overcome naltrexone’s opioid blockade by taking larger amounts of opioids. Doing so can lead to overdose, coma, or death. The risk of overdose can also rise after naltrexone is stopped because opioid tolerance may be lower than it was before treatment. Keeping naloxone available and making sure family members know how to use it remains an important precaution for anyone at risk of opioid overdose.
Patients should tell every healthcare professional involved in their care that they take naltrexone or Vivitrol. This matters if surgery, emergency treatment, or pain management is needed. A care team can plan non-opioid approaches when possible and coordinate safely if stronger pain treatment becomes necessary.
Medication works best as part of ongoing care
Recovery is rarely a single appointment or prescription. Regular follow-up gives patients a place to talk honestly about cravings, alcohol or opioid use, side effects, missed doses, sleep, physical health, and the practical obstacles that can interfere with treatment.
Primary care can be a valuable home base for this work because substance-use treatment often overlaps with other health needs. Blood pressure, liver health, preventive screenings, nutrition, chronic conditions, and medication changes all deserve attention. Bringing these pieces together can reduce the burden of managing care across disconnected offices.
At MedHaven Health, patients can expect a respectful, individualized conversation about alcohol and substance use. Asking for help is a healthcare decision, not something to be ashamed of. The goal is to create a plan that feels medically sound, realistic, and supportive of the life a patient wants to build.
Common questions about naltrexone
Does naltrexone make a person stop drinking or using opioids?
No. It does not force abstinence or make decisions for a patient. For alcohol use disorder, it may reduce cravings and heavy drinking. For opioid use disorder, it blocks opioid effects after a person is safely opioid-free. A patient’s commitment, support system, follow-up care, and treatment plan still matter.
Can someone take naltrexone while still using opioids?
No. Naltrexone should not be started while opioids are still in the body. Doing so can cause severe precipitated withdrawal. Anyone using prescription opioids, heroin, fentanyl, or opioid-containing cough or pain medicines should speak with a clinician before taking either oral naltrexone or Vivitrol.
How long does Vivitrol last?
Vivitrol is typically administered every four weeks. Its effects do not disappear immediately if a patient changes their mind or develops a need for opioid pain treatment, which is why careful screening and advance planning are so important.
If alcohol or opioid use is affecting your health, work, relationships, or sense of control, support can begin with one straightforward medical conversation. A compassionate care plan can help turn a difficult next step into a manageable one.
