Understanding Sublocade Side Effects and Safety Benefits

What Sublocade is and how it works

If you are exploring medication assisted treatment for opioid addiction, you will likely hear about Sublocade. Understanding Sublocade side effects and safety can help you decide whether this monthly injection is a good fit for you.

Sublocade is a once monthly, extended release injection that contains buprenorphine, a medication used to treat moderate to severe opioid use disorder in adults. It is given just under the skin of your abdomen by a healthcare provider, not into a vein. Over about a month, it slowly releases buprenorphine into your bloodstream, which helps:

• Reduce cravings
• Block or blunt the effects of other opioids
• Stabilize your mood and daily functioning

You usually start with buprenorphine films or tablets first. Once you are stable on a daily dose, your provider can transition you to Sublocade injections so you no longer have to remember medication every day [1]. If you want a deeper look at how the medication is released in your body, you can review how the Sublocade shot works.

Compared with older treatments like methadone, buprenorphine based options such as Sublocade tend to have a safer profile and fewer daily clinic requirements. You can read more about overall differences in buprenorphine vs methadone treatment.

Proven effectiveness and long term safety

Sublocade has been studied in people with moderate to severe opioid use disorder, including long term follow up.

A 12 month multicenter study of 669 adults found that about 60.7 percent completed the entire year and received up to 12 injections, and the data supported a favorable long term safety profile when used as directed [2]. In other words, most people were able to stay on treatment and tolerate the medication over time.

Real world experiences line up with these findings:

• On Drugs.com, 313 user reviews gave Sublocade an average rating of 7.9 out of 10. About 72 percent reported a positive experience and 13 percent reported a negative one [3].
• On WebMD, about 70 percent of 83 reviewers reported a positive effect, with an average rating of 3.7 out of 5 as of 2024 [4].

Many people say Sublocade helped them:

• Stabilize cravings more consistently than daily Suboxone films or methadone
• Go longer between episodes of withdrawal
• Feel less “up and down” throughout the day [4]

Several individuals who switched from Suboxone to Sublocade reported that stopping injections later led to minimal or even no withdrawal, and that any symptoms were milder than what they felt when stopping Suboxone [3]. Experiences vary, but this is one reason you may hear more patients and providers talking about Sublocade.

If you want to learn more about how effective this option can be overall, it can be helpful to review a detailed look at how effective Sublocade is for addiction.

Common Sublocade side effects you might notice

Like any powerful medication, Sublocade can cause side effects. Most are mild to moderate and improve as your body adjusts, but you should know what to expect.

Across clinical trials and post marketing reports, the most common side effects that occurred in at least 5 percent of people include:

• Constipation
• Headache
• Nausea or vomiting
• Tiredness or fatigue
• Increased liver enzymes on blood tests
• Pain, itching, or burning at the injection site [5]

From patient reports on Drugs.com and WebMD, you also see:

• Joint pain
• Sleep problems or insomnia
• Mood shifts such as irritability, agitation, or anxiety
• Blurred vision in some cases [4]

Most people who get side effects describe them as temporary. For example, some patients mention feeling “off,” sweating, or having hot and cold flashes for the first week or two after an injection, but say these symptoms usually fade quickly [3].

If you have ongoing symptoms that make daily life hard, talk with your provider. Dosing adjustments, timing, or added support for sleep, anxiety, or constipation can make Sublocade easier to tolerate.

Injection site reactions and what to expect

Because Sublocade is delivered as a subcutaneous injection, local reactions at the injection site are especially common.

You might notice:

• A sharp or burning sensation during the injection
• Soreness or tenderness for a few days afterward
• A small, firm lump under the skin that slowly gets smaller
• Mild redness, bruising, or itching

Patients frequently describe the injection as briefly painful with a few days of soreness, and some note that a small lump can last several weeks before it dissolves [6]. The manufacturer advises you not to rub or massage the area and to avoid tight clothing over the injection site [1].

A rare but serious reaction is infection at the injection site. At least one WebMD reviewer reported a severe infection that led to systemic clotting and a near fatal complication requiring emergency care [4]. While this is not common, you should call your provider or go to urgent care right away if you notice:

• Increasing redness, warmth, or swelling
• Pus or drainage
• Fever, chills, or feeling suddenly very ill

Because of a serious risk of harm or death if it is injected into a vein, Sublocade carries a boxed warning and is only allowed to be prepared and given by trained healthcare professionals [7]. This controlled process is an important part of its safety design.

Serious risks, safety warnings, and who should avoid it

Sublocade is generally safer than full opioid agonists, but it still has significant warnings you need to understand.

Breathing problems and overdose risk

Like other opioids, buprenorphine can slow your breathing. With Sublocade, that risk is highest if:

• You misuse it, such as attempting self injection
• You combine it with other central nervous system depressants, including benzodiazepines, alcohol, sleeping pills, or other opioids

Life threatening respiratory depression, meaning breathing that becomes dangerously slow or stops, is one of the most serious risks described in official safety information [8]. Your provider should counsel you about these risks and monitor you closely, especially early in treatment or when other medications change.

You and your family should also have naloxone or nalmefene available to reverse potential opioid overdose, and know to call 911 right away in an emergency [9].

Liver health and blood pressure

Sublocade can affect your liver. Increased liver enzymes are one of the common side effects, and more serious liver damage, called hepatotoxicity, is possible, especially if you already have liver disease or drink heavily [10]. You will need blood tests to check your liver before starting and periodically during treatment [11].

The medication can also cause low blood pressure, including orthostatic hypotension, which is a sudden drop in blood pressure when standing up. This can lead to dizziness or fainting [12]. Let your provider know if you have heart rhythm problems, severe lung disease, or frequent episodes of lightheadedness.

Allergic reactions and contraindications

You should not receive Sublocade if:

• You are opioid naive, meaning you are not already physically dependent on opioids
• You have a known allergy to buprenorphine or any components of the injection system, such as the biodegradable polymer or the solvent N methyl 2 pyrrolidone (NMP) [13]

Any signs of a severe allergic reaction, such as difficulty breathing, swelling of the face or throat, or a widespread rash, require emergency care [12].

Pregnancy, breastfeeding, and fertility

Using Sublocade during pregnancy can lead to life threatening withdrawal symptoms in your newborn. Babies may need prolonged medical treatment after birth [1]. Buprenorphine also passes into breast milk and can affect a nursing baby, so your baby should be watched carefully for drowsiness and breathing problems if you breastfeed while on Sublocade [1].

The manufacturer also notes that Sublocade may affect fertility in both males and females, so if you are planning a pregnancy or have concerns about future fertility, it is important to talk with your provider before or during treatment [10].

People aged 65 or older may be at higher risk for some side effects. Closer monitoring and careful dose selection are recommended in this group [12].

Dependence, withdrawal, and stopping Sublocade

Physical dependence is expected with any long term opioid treatment, including buprenorphine. Your body gets used to the medication, and stopping suddenly can trigger withdrawal symptoms.

With Sublocade, you have some unique considerations:

• The medication is long acting and can remain in your system for months after your last injection
• Buprenorphine levels decline gradually over time

Because of this, people who stop Sublocade need to be monitored for several months for withdrawal symptoms and prolonged drug effects, as well as possible interactions with other medications that are started later [14].

Some patients report little to no withdrawal when they stop injections. Others describe:

• Fatigue and low motivation
• Headaches
• Irritability and mood swings
• Waves of discomfort that come and go, sometimes lasting up to a year in milder form [4]

Several people on Drugs.com say they experienced fewer and milder symptoms when discontinuing Sublocade compared with Suboxone, although this is not universal [3].

There is currently limited official guidance on long term use, tapering strategies, or standardized protocols for stopping Sublocade, and some patients say they wish there were clearer instructions [3]. For this reason, it is essential not to stop on your own. Work closely with a provider experienced in buprenorphine treatment to plan a safe and gradual discontinuation.

You can explore how Sublocade compares overall with daily buprenorphine films in the detailed Sublocade vs Suboxone comparison and whether Sublocade can replace Suboxone therapy in your specific case.

Why Sublocade and buprenorphine are gaining use

Despite the side effects and safety warnings, Sublocade and other buprenorphine based treatments are being used more often across the United States. Some key reasons include:

• More stable blood levels of medication, which can reduce daily cravings and “roller coaster” symptoms
• Lower risk of misuse compared with take home films or tablets, since the injection is given in a clinic and cannot be easily diverted
• Less daily decision making, which helps if you struggle with consistency or feel triggered by handling medication every day
• A safety profile that is generally preferable to staying on illicit opioids, with a reduced risk of fatal overdose when taken as directed

Sublocade has already been prescribed to over 350,000 people in the US as of 2025 [11]. Many patients prefer once monthly injections when they want to focus on work, school, or family without worrying about missed doses or lost films.

If you are curious about other buprenorphine options, such as Subutex or standard buprenorphine tablets, you can review Subutex vs buprenorphine explained and broader guides on buprenorphine treatment covered by Medicaid.

Medicaid coverage, cost, and access to care

For many people, the biggest question is not only safety, but also whether they can actually afford Sublocade. If you have Medicaid, there is a good chance you can access this treatment with manageable out of pocket costs.

Coverage and requirements vary by state, but many Medicaid programs do pay for:

• Sublocade injections for eligible adults with opioid use disorder
• Outpatient visits with a qualified buprenorphine provider
• Related lab work, like liver function tests

To explore your options, you can start with:

• A detailed overview of Medicaid coverage for Sublocade injections
• A closer look at whether Sublocade is covered by Medicaid in your state
• Information on the cost of Sublocade treatment with Medicaid

If you are still comparing approaches, you might also review coverage for buprenorphine clinics covered by Medicaid and find a buprenorphine treatment covered by Medicaid that fits your needs.

When you are ready to take the next step, you can:

• Look for Sublocade doctors that take Medicaid
• Use tools to find a Sublocade clinic near you
• Learn more about the Sublocade injection for opioid treatment

Summary: Sublocade side effects and safety

Understanding Sublocade side effects and safety helps you weigh real risks against the very real dangers of ongoing opioid use. With careful monitoring, honest communication with your provider, and support for the emotional side of recovery, this long acting medication can be a powerful tool in rebuilding your life.

References

1. (Drugs.com)
2. (Indivior, PR Newswire)
3. (Drugs.com)
4. (WebMD)
5. (Indivior, PR Newswire, Sublocade, Drugs.com, WebMD)
6. (Drugs.com, Drugs.com)
7. (Indivior, PR Newswire, Drugs.com)
8. (Indivior, PR Newswire, Drugs.com, WebMD)
9. (Drugs.com, WebMD)
10. (Sublocade, WebMD)
11. (Sublocade)
12. (WebMD)
13. (Indivior, Sublocade)
14. (PR Newswire)
15. (WebMD, Drugs.com)
16. (PR Newswire, WebMD)