If you’ve been told that medication-assisted treatment is an option, you’ve probably heard both names — Suboxone and Vivitrol. They’re both used in opioid use disorder treatment. They’re not interchangeable. Understanding how they work differently makes it easier to have a real conversation with a clinical team about which makes sense for your situation.
What Is Suboxone?
Suboxone is a combination of two medications: buprenorphine and naloxone. Buprenorphine is a partial opioid agonist — it binds to the same opioid receptors in the brain that heroin or fentanyl would, but produces a much weaker effect. It reduces withdrawal symptoms and cravings without producing a full opioid high. Naloxone is added as a deterrent against injection misuse.
It’s taken daily, typically as a sublingual film that dissolves under the tongue. One of its practical advantages is that it can be started relatively early in withdrawal — a clinician assesses withdrawal severity before the first dose, but patients don’t need to be fully opioid-free before beginning.
What Is Vivitrol?
Vivitrol is the brand name for extended-release injectable naltrexone. Unlike Suboxone, it is not an opioid at all — it’s a full opioid antagonist, meaning it blocks opioid receptors rather than stimulating them. While it’s active, opioids cannot produce any effect. Someone who uses heroin while on Vivitrol will feel nothing from it.
It’s administered as a monthly injection, eliminating the need for daily medication management. The trade-off is the requirement: patients must be completely opioid-free for 7 to 10 days before the first injection. Starting too early — with opioids still in the system — causes precipitated withdrawal, which is severe and begins within minutes of the injection.
How They Work Differently
The core difference is the mechanism. Suboxone partially activates opioid receptors — it occupies them, which prevents withdrawal and reduces cravings, but it doesn’t produce the full effect of a drug like heroin. It works with the receptor system.
Vivitrol works against it. It blocks receptors entirely, so that any opioid taken while the medication is active cannot attach effectively enough to produce a high. There’s no partial agonism, no receptor stimulation — just a complete block.
This distinction matters clinically because the two medications address different dimensions of the problem. Suboxone is particularly effective at managing the physical withdrawal and craving cycle. Vivitrol is most effective after the acute phase — it removes the neurochemical reward from relapse, which changes the behavioral reinforcement loop.
Suboxone — Who Is It Best For?
Suboxone tends to be the better fit for people who are in early withdrawal and need symptom management, those who struggle with intense cravings during the first weeks of recovery, and people who can’t reliably get through the 7 to 10 opioid-free days required before Vivitrol. The daily dosing structure also provides a consistent treatment touchpoint — coming in for medication is a built-in accountability mechanism.
It’s also the more studied of the two medications for opioid use disorder, with decades of evidence behind it across different patient populations.
Vivitrol — Who Is It Best For?
Vivitrol tends to suit people who are already detoxed and opioid-free, those who prefer not to take an opioid-based medication, and those who want the structure of monthly rather than daily dosing. It’s also a strong option for people with high relapse risk who want a pharmacological barrier — if you use while on Vivitrol, there’s no reinforcement. The compulsion to use is present but the reward is absent.
The 7 to 10 day opioid-free requirement is the main barrier. For people coming directly from active fentanyl use, clearing that window without relapsing is genuinely difficult and often requires a supervised detox period first.
Can You Switch Between Them?
Yes — and it happens in both directions. Switching from Suboxone to Vivitrol requires completing the opioid-free window, which means tapering off Suboxone first and waiting until buprenorphine has cleared the system (typically 5 to 7 days after the last dose, sometimes longer). Switching from Vivitrol to Suboxone is simpler — once the Vivitrol injection has worn off, Suboxone can be started when withdrawal symptoms appear.
What Does Waterside Use?
Waterside Recovery offers both, integrated across PHP, IOP, and outpatient levels of care. The clinical team determines which medication fits a particular patient’s history, current presentation, and preference at intake — there’s no default. Both are evidence-based tools with strong outcomes data; the question is which one serves the individual’s clinical situation.
For a deeper look at each option, the dedicated pages on Suboxone treatment for opioids and Vivitrol for opioid addiction cover how each works within Waterside’s treatment model. The broader context on medication-assisted treatment explains how both fit into evidence-based opioid care.
If you have questions about which option might be right for your situation, opioid treatment at Waterside Recovery starts with a clinical assessment that includes that conversation. Call (866) 671-8620 — we can talk through the options before you commit to anything.