What Is Vivitrol? Is It Effective?

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The opioid crisis in the U.S. has developed over more than twenty years, leading to hundreds of thousands of overdose fatalities and continuous public health issues. As opioid usage patterns have transitioned, from prescribed painkillers to heroin and synthetic opioids like fentanyl, the demand for effective, evidence-based treatment has never been more critical.

Opioid Use Disorder (OUD) is a chronic, relapsing medical condition marked by compulsive opioid consumption despite adverse consequences. Repeated exposure to opioids alters brain circuits related to reward, stress response, and decision-making. Over time, individuals may develop tolerance (requiring more of the drug to achieve the same effect), physical dependence, and strong cravings. When opioid use ceases abruptly, withdrawal symptoms can arise, often leading to continued use and increasing relapse risk.

One of the most significant advancements in addiction medicine is the development of Medication-Assisted Treatment (MAT), now more commonly called Medications for Opioid Use Disorder (MOUD). These FDA-approved drugs help stabilize brain chemistry, diminish cravings, and decrease the risk of overdose.

Among these treatments is Vivitrol, the brand name for extended-release naltrexone. Vivitrol is a once-monthly injectable medication that functions differently from opioid agonist treatments like methadone or buprenorphine. Instead of activating opioid receptors, Vivitrol blocks them. This means that if a person uses opioids while on Vivitrol, they will not experience the euphoric effects, reducing the incentive to relapse.

But how effective is it?

Clinical research indicates that extended-release naltrexone and addiction counseling can effectively prevent relapse for those who have already completed detoxification and are entirely opioid-free before starting the medication. It has also been shown to reduce heavy drinking in individuals with alcohol use disorder. However, because patients must be fully detoxed before the first injection, it may not be suitable for everyone.

Understanding how Vivitrol works, who it’s suitable for, and how it compares to other treatment options is crucial when making informed decisions about recovery. In the sections below, we’ll explore the science behind Vivitrol, its benefits and limitations, and the research on its effectiveness.

What Is Vivitrol?

Vivitrol is an FDA-approved medication prescribed to aid in preventing relapse in people with OUD and AUD. It includes naltrexone, an opioid receptor antagonist that functions by obstructing the effects of opioids in the brain.

Naltrexone is offered as an oral tablet, but Vivitrol is a long-lasting, once-a-month intramuscular injection. This extended-release formulation delivers continuous opioid receptor blockage for roughly 28 to 30 days.

How Vivitrol Functions

Vivitrol attaches to opioid receptors but doesn’t activate them. This means that if someone takes opioids while on Vivitrol, they won’t feel the usual high or calming effects. By preventing these sensations, Vivitrol diminishes the rewarding feeling associated with opioid consumption, which can assist in lessening cravings and minimizing the chance of relapse.

Since Vivitrol doesn’t trigger opioid receptors, it is non-addictive and doesn’t lead to physical dependency.

Key Safety Factors

Vivitrol treatment can commence only after an individual has completely detoxified from opioids. Patients need to be free from opioids for a minimum of seven to 14 days before their initial injection. This criterion is crucial because administering Vivitrol while opioids remain in the system can cause precipitated withdrawal, a swift and intense onset of withdrawal symptoms. Precipitated withdrawal can be severe and demands immediate medical attention.

Therefore, healthcare professionals typically conduct a comprehensive medical and substance-use evaluation to ensure patient safety. They verify that there has been an adequate period without opioids and occasionally carry out a naloxone challenge test if clinically necessary. Only once medical approval is granted should the first injection be given, ensuring the patient’s well-being and minimizing potential risks.

Length and Therapy Plan

Vivitrol is administered once every four weeks by a healthcare provider. The length of treatment depends on personal requirements, but many practitioners advise maintaining the medication for a minimum of six to twelve months, often in conjunction with behavioral therapy and recovery support services.

Similar to other drugs for opioid use disorder, Vivitrol is most beneficial when paired with counseling or psychotherapy, relapse prevention strategies, continuous medical supervision, and support systems for recovery. When used correctly as part of a comprehensive treatment plan, Vivitrol can be an essential asset in promoting long-term recovery.

Hazards and Safety Factors When Using Vivitrol

Vivitrol is a potent, FDA-approved drug for treating opioid use disorder. However, like all medications, it comes with important safety considerations.

One particularly serious risk involves using opioids during or following treatment. Since Vivitrol blocks opioid receptors, users won’t experience the usual euphoric effects if they take opioids while the medication is active. In some instances, an individual might try to overcome this blockade by consuming larger quantities of opioids. This greatly heightens the risk of respiratory depression and potentially fatal overdose.

There is also an increased risk of overdose in two particular scenarios: after missing a dose or discontinuing Vivitrol, and upon finishing treatment. Tolerance to opioids decreases during treatment. If a person resumes opioid use at the same dosage they used before treatment, their body might not be able to handle it, increasing the risk of a life-threatening overdose. For this reason, patients on Vivitrol should receive education on overdose prevention and might be advised to carry naloxone, a medication that reverses opioid overdoses.

Beyond the risk of overdose, other possible risks and side effects include reactions at the injection site, which can sometimes be severe, as well as increases in liver enzymes. Some individuals might experience a depressed mood or suicidal ideation. Additionally, precipitated withdrawal can occur if opioids are present in the system when starting treatment.

Before beginning Vivitrol, a healthcare provider will evaluate medical history, liver function, and opioid-free status to decide if the medication is suitable.

An Instrument, Not a Complete Remedy

Vivitrol is often viewed as a crucial component in MAT for opioid dependency. Nevertheless, it is not a remedy for addiction. Opioid dependency is a persistent health issue that generally necessitates a thorough, long-term treatment plan.

Vivitrol is most beneficial when paired with:

When administered correctly and under medical guidance, Vivitrol can greatly lower the chance of relapse and aid in sustained recovery. Proper patient selection, education, and follow-up are vital to enhancing benefits and minimizing risks.

Does Vivitrol Work Well?

Vivitrol functions by obstructing opioid receptors in the brain. As an opioid antagonist, it stops opioids from triggering these receptors, so a person won’t feel the usual euphoric or calming effects if they take opioids while on the medication. By diminishing the pleasurable effects of opioids, Vivitrol can assist in reducing cravings and minimizing the chance of relapse.

What Do the Studies Reveal?

Extended-release naltrexone has been assessed in randomized, double-blind, placebo-controlled clinical trials. In one six-month study with participants who had opioid dependence and completed detoxification, individuals receiving Vivitrol were much more likely to remain abstinent compared to those given a placebo. Additionally, those treated with Vivitrol experienced fewer relapses into opioid dependence.

Craving scores significantly dropped in the Vivitrol group, whereas cravings increased in the placebo group. These results align with broader studies indicating that extended-release naltrexone can lower the risk of relapse in people who are fully detoxified before beginning treatment.

Significant Background

Vivitrol shows the greatest effectiveness for people who have completed detox from opioids, are determined to stay abstinent, and participate in counseling or behavioral therapy along with medication. It’s important to highlight that Vivitrol requires a complete opioid-free period before starting, which can make beginning treatment more challenging compared to other medications for opioid use disorder, like buprenorphine or methadone.

Besides opioid use disorder, naltrexone (in both oral and extended-release forms) is also FDA-approved for alcohol use disorder. For alcohol treatment, some individuals may be prescribed oral naltrexone tablets, while others may find the monthly injectable version more beneficial.

Key Point

Research indicates that Vivitrol is a successful drug for minimizing opioid relapse and cravings when properly administered within a complete treatment strategy. As with all addiction therapies, the best results occur when medication is paired with behavioral therapy, medical oversight, and ongoing recovery assistance.

Prepared for Expert Addiction Care? 

Addiction is a multifaceted, long-term medical condition impacting the brain, behavior, and overall well-being. It can have a significant impact on the individual affected, their family, and their support network, both physically and emotionally. Seeking assistance is not a sign of frailty; it is a medically sound and often life-saving choice.

California Behavioral Health in Palm Springs, CA, offers thorough, evidence-based care for substance use disorders and accompanying mental health issues. Our clinical team recognizes that many people reach out during some of the most challenging times of their lives. From the initial contact onward, our aim is to deliver empathetic, professional support rooted in the best practices of addiction medicine and behavioral healthcare.

We provide various levels of care tailored to meet diverse clinical requirements, which may include:

Treatment plans are personalized, considering medical history, substance use patterns, mental health needs, and individual recovery goals.

Early intervention enhances outcomes. If you or a loved one is facing substance use challenges, professional treatment can offer the structure, support, and clinical expertise needed to initiate recovery safely and effectively.

Contact our addiction hotline today speak with a member of our team. We will help you explore your options and take the first step toward enduring change.