Naltrexone vs. Vivitrol: Which Form Is Right for You?

Medically reviewed by Joseph Volpicelli, MD, PhD

Your doctor just said the word "naltrexone," and now you're staring at two very different paths: a pill you take every morning, or a shot you get once a month. That's the real crossroads behind naltrexone vs. Vivitrol: both rely on the exact same medication to quiet cravings, yet how you actually take it couldn't be more different. One fits into a daily routine you control. The other fits into a monthly appointment.

Here's why that difference matters more than most people expect, and how to figure out which side of it you belong on.

What’s the Real Difference Between Naltrexone and Vivitrol? 

Naltrexone and Vivitrol share the same active ingredient and block the same opioid receptors to reduce cravings for alcohol and opioids. The main difference is formulation and delivery. Naltrexone comes as a daily tablet you swallow, while Vivitrol is a brand-name, extended-release version that a provider injects into your muscle once a month. 

Each went through its own FDA approval process, so cost, insurance coverage, and prescribing rules can differ even though the core medication works identically inside your body.

How Each Form is Taken

Oral naltrexone comes as a 50-milligram tablet you take once a day, and timing your dose can affect both side effects and results. Vivitrol requires a trip to a clinic or provider's office, where a trained professional injects it into your gluteal muscle, and the effects last the full month. 

Missing a dose looks different for each option. Skip a pill, and you take the next one on schedule, but skipping or delaying a Vivitrol appointment means going without coverage until your next visit.

How Effective Are Naltrexone and Vivitrol for Alcohol Use Disorder? 

When you compare naltrexone vs. Vivitrol for alcohol use disorder, both show real, measurable results, though the data plays out differently for each. 

In its pivotal clinical trial, Vivitrol cut heavy drinking days by 25% compared to placebo over six months. A separate analysis of injectable naltrexone trials found participants averaged two fewer drinking days and 1.2 fewer heavy drinking days per month than placebo, with results holding steady across different patient groups. 

Oral naltrexone works through this same mechanism and produces similar benefits in its own trials, but those results shift more between studies, largely because people taking a daily pill do not always take it every day.

Comparing the Side Effects of Naltrexone vs. Vivitrol

Both medications carry a similar side effect profile since they work through the same mechanism, though the specific symptoms and how strongly they hit can differ based on how the drug enters your body. Oral naltrexone passes through your digestive system and liver, which tends to affect your gut directly. The injection skips that route and introduces its own set of reactions at the injection site instead.

Common side effects reported with oral naltrexone include:

• Nausea
• Headache
• Dizziness
• Fatigue
• Sleep disturbances, including insomnia or vivid dreams
• Decreased appetite

Vivitrol carries many of these same reactions, plus a few that come specifically from the injection itself, according to its prescribing information:

• Nausea, reported in roughly 33% of patients during clinical trials
• Injection site pain, swelling, or induration
• Headache
• Fatigue or general weakness
• Insomnia
• Vomiting and diarrhea
• Decreased appetite
• Allergic reaction to the coating 

Exploring the Cost Comparison

Price often becomes the deciding factor once people see the numbers side by side. According to cost data compiled by Addiction Center, generic oral naltrexone costs far less than the brand-name injection, with or without insurance. 

Here's the direct comparison, including what a full Oar Health membership costs when medication is included:

Dosing Frequency, Duration of Action, and Staying Compliant With Treatment

Once you get past effectiveness and side effects, naltrexone vs. Vivitrol comes down to three practical differences: how often you take it, how long each dose lasts in your body, and how likely you are to stick with it long term.

• Dosing frequency: Oral naltrexone requires a tablet every day. Vivitrol requires one injection every four weeks.
• Duration of action: A standard oral dose blocks opioid receptors for about 24 hours, so missing even one day leaves you unprotected. A single Vivitrol injection maintains that same blockade for approximately 28 days.
• Compliance:

How to Decide Which Option Fits Your Life and Recovery Goals

If a daily routine is something you can commit to and you want full control over your treatment without regular appointments, oral naltrexone tends to be a better fit and comes at a fraction of the cost.

Oral naltrexone can be taken two ways: daily, where you take one pill every day, or targeted, also known as the Sinclair Method, where you take a pill at least one hour before your first drink on days you plan to drink. Daily dosing works like any other routine medication, while the targeted approach ties each dose to drinking itself.

On the other hand, if you struggle to remember daily medication or you want one less decision to make each day, Vivitrol's monthly injection removes that variable, even though it means a repeat clinic visit and a much higher price tag every month. 

Providers often factor in your medication adherence history, your insurance coverage, and which condition you're treating, since only Vivitrol carries approval for opioid dependence. 

Either way, both medications rely on the same core drug, so the better choice comes down to fit for your life rather than a difference in raw effectiveness.

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FAQs About Naltrexone vs. Vivitrol

Is nausea worse with naltrexone or Vivitrol? 

Nausea is common with both. Vivitrol's clinical trials found it in about 33% of patients, and oral naltrexone causes comparable rates during the first one to two weeks of treatment.

What GI side effects are common with naltrexone and Vivitrol? 

Vivitrol’s trials reported vomiting in 14% of patients and diarrhea in 13%, both slightly more frequent than typical reports for the oral tablet. Most GI symptoms fade within a few weeks for either form.

Can you switch between oral naltrexone and Vivitrol? 

Providers can move you from one form to the other, but not both together. Oar Health's own naltrexone pill vs. injection comparison notes that combining the two exceeds the recommended dose for alcohol use disorder.

Does insurance cover naltrexone or Vivitrol? 

Coverage depends heavily on your plan and which form your provider prescribes. Oral naltrexone is cheap enough that most people pay cash, while Vivitrol usually needs insurance or a manufacturer savings program to stay affordable.

This article was medically reviewed by Joseph Volpicelli, MD, PhD, a Senior Adviser to Oar Health whose research established naltrexone as a treatment for alcohol use disorder. Review confirms the clinical information here was accurate and current as of October 19, 2026. It is not a substitute for advice from your own clinician.