Sublocade and Suboxone are not the same medication, though they share the same core ingredient: buprenorphine, a partial opioid that reduces cravings and withdrawal symptoms in people with opioid use disorder. The key differences are how you take them, what else is in them, and how the medication moves through your body. Suboxone is a daily film dissolved under the tongue, while Sublocade is a monthly injection given by a healthcare provider.
What’s in Each Medication
Both medications rely on buprenorphine to do the heavy lifting. Buprenorphine partially activates the same brain receptors that opioids target, enough to ease cravings and prevent withdrawal but not enough to produce a strong high. That partial activation is what makes it effective for treatment without the risks of full opioid agonists like methadone.
Suboxone adds a second ingredient: naloxone, an opioid blocker, in a 4:1 ratio of buprenorphine to naloxone. Naloxone is poorly absorbed through the digestive tract, so when you take Suboxone as directed (dissolved under the tongue), it has very little effect. But if someone tries to crush and inject or snort the film, naloxone activates and blocks the opioid effects, serving as a built-in abuse deterrent. Sublocade contains only buprenorphine, with no naloxone, because it’s administered by injection in a clinical setting, which makes misuse far less of a concern.
How Each One Is Taken
Suboxone comes as a dissolvable film placed under the tongue, typically taken once daily. Doses range from 8 to 24 mg per day, adjusted based on how well symptoms are controlled. You manage it at home, which offers flexibility but also means you need to remember it every day.
Sublocade is a subcutaneous injection given in the abdomen once every 28 days, and it can only be administered by a healthcare provider. The first two injections are 300 mg. After that, the dose drops to 100 mg for maintenance, though some patients stay at 300 mg depending on their history and clinical needs. Once injected, the liquid contacts bodily fluids and forms a small solid deposit under the skin that slowly releases buprenorphine over the course of the month.
How the Drug Behaves in Your Body
This is one of the most meaningful differences between the two. With daily Suboxone, buprenorphine levels in your blood rise after each dose and fall before the next one, creating peaks and troughs. FDA pharmacokinetic data shows that at a 24 mg daily dose, blood levels swing from a peak of about 8.3 ng/mL down to a trough of 1.5 ng/mL each day.
Sublocade works differently. After the injection, buprenorphine peaks at around 24 hours, then gradually declines and stabilizes by about week two. After four monthly 300 mg injections, average blood levels reach roughly 4.8 ng/mL, with the trough staying around 4.0 ng/mL. That’s a much narrower range between high and low points, meaning your body sees a more consistent level of medication throughout the month. Sublocade also bypasses the digestive system entirely, so more of the drug reaches your bloodstream compared to sublingual dosing.
Treatment Retention and Effectiveness
Clinical trials comparing the two formulations have found similar treatment response rates based on urine drug testing, including among people who were using fentanyl at baseline. A large retrospective study of commercially insured patients found that permanent dropout rates were statistically similar for both: about 39% for sublingual buprenorphine and 41% for Sublocade at six months, with no significant difference at any time point out to 12 months.
That said, the same study found that “retention,” defined as continuous, uninterrupted use, was higher for the sublingual form at every time point measured. At six months, 49.5% of sublingual patients remained on treatment continuously versus 13.5% of Sublocade patients. This likely reflects practical barriers to monthly clinic visits (scheduling, transportation, insurance lapses) rather than a difference in how well the medication works. The dropout data, which tracks whether patients permanently stopped treatment, tells a more balanced story.
Side Effects Unique to Each Form
Both medications carry the general side effects of buprenorphine: constipation, headache, nausea, and sleep disturbances. But each form has side effects the other doesn’t.
Sublocade causes injection site reactions in about 16.5% of patients. The most common are pain at the injection site (7.2%), itching (6.6%), and redness (4.7%). A small, firm lump can form under the skin where the depot sits. In clinical trials, most of these reactions were mild to moderate, and only one was serious enough to cause someone to stop treatment. Rare post-marketing reports have included more severe reactions like abscesses or skin breakdown, usually linked to injections that were accidentally placed too deep or too shallow.
Suboxone carries a risk that Sublocade doesn’t: dental problems. In 2022, the FDA issued a warning that buprenorphine medicines dissolved in the mouth have been linked to tooth decay, cavities, oral infections, and tooth loss, even in patients with no prior dental issues. The FDA specifically noted that this warning does not apply to Sublocade or other non-oral forms of buprenorphine, since the drug never contacts the teeth.
Cost Without Insurance
The sticker prices are dramatically different. Without insurance, a monthly supply of Suboxone film (30 films at the lowest strength) costs roughly $155. A single Sublocade 100 mg injection runs about $2,159. Most people using Sublocade have insurance or Medicaid coverage that significantly reduces out-of-pocket costs, and the manufacturer offers a patient assistance program. But if you’re paying cash, the price gap is substantial.
Switching From Suboxone to Sublocade
You can’t start Sublocade from scratch. The standard protocol requires you to first be stabilized on sublingual buprenorphine (like Suboxone) for at least 7 days before receiving your first Sublocade injection. This establishes a baseline level of buprenorphine in your system and confirms you tolerate the medication well. Some newer approaches have shortened this stabilization window to as few as two days using transdermal buprenorphine patches, followed by a small test dose of sublingual buprenorphine to confirm readiness before the injection. The goal in every case is to avoid precipitated withdrawal, a sudden onset of withdrawal symptoms that can happen if buprenorphine is introduced too quickly.
Which One Makes Sense for You
The choice often comes down to lifestyle and priorities. Sublocade removes the daily decision entirely. You show up once a month, get your injection, and don’t think about medication again for four weeks. That can be a major advantage for people who struggle with adherence, who want fewer daily reminders of their treatment, or who are in situations where carrying medication is complicated.
Suboxone offers more flexibility and easier dose adjustments. If side effects emerge or your needs change, your provider can tweak the dose quickly. It’s also more accessible in terms of cost and availability, since any provider with a standard prescription can manage it, while Sublocade requires an in-office injection. For many people, the path starts with Suboxone and transitions to Sublocade once they’re stable and ready for the convenience of monthly dosing.