Buprenorphine Side Effects: Common and Serious
The common and serious side effects of buprenorphine, the medication in Suboxone and Subutex, when to call a doctor, and the risks of dependence and dangerous combinations.
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician and Addiction Medicine Specialist, Phuket Island Rehab.
Buprenorphine is a partial opioid medication used to treat opioid addiction (in Suboxone and Subutex) and sometimes pain, and like all opioids it can cause side effects, though its ceiling effect makes it safer than full opioids. Common side effects of buprenorphine include headache, nausea, vomiting, constipation, sweating, dizziness, drowsiness, insomnia, and, with sublingual tablets or film, numbness or irritation in the mouth. More serious side effects can include severe breathing problems (respiratory depression), which can be life-threatening, especially when buprenorphine is combined with benzodiazepines, alcohol, or other sedatives; serious allergic reactions; liver problems; low blood pressure and fainting; and adrenal problems. Because buprenorphine is an opioid, it causes physical dependence and withdrawal if stopped suddenly, so it should be tapered rather than stopped abruptly. Most common side effects are mild and often ease over time or can be managed, while serious effects need prompt medical attention. You should call your doctor about serious or persistent problems and seek emergency help for very slow or difficult breathing, severe drowsiness, or signs of a serious allergic reaction. Tell your doctor about all medications and any alcohol use, never combine buprenorphine with other sedatives without medical advice, and take it only as prescribed. Used correctly under medical supervision, buprenorphine is a safe and effective medication.
What is buprenorphine and what side effects can it cause?
Buprenorphine is a partial opioid medication best known for treating opioid addiction, where it is the active ingredient in Suboxone (combined with naloxone) and Subutex (buprenorphine alone), and it is also used in some forms to treat pain. As a partial opioid agonist, it acts on opioid receptors to relieve cravings and withdrawal, but with a ceiling effect that makes it much safer than full opioids such as methadone or heroin, with a lower risk of overdose. Even so, because it is an opioid, buprenorphine can cause side effects, ranging from common and usually manageable effects to rarer but serious ones, and it carries the risk of physical dependence that comes with any opioid.
This article explains the common and serious side effects of buprenorphine, when you should call your doctor or seek emergency help, and the risks of physical dependence, withdrawal, and dangerous drug combinations. Because buprenorphine is the medication in both Suboxone and Subutex, its side effects apply to both. The key safety messages are to take buprenorphine only exactly as prescribed, to tell your doctor about all the medications you take and any alcohol use, never to combine it with other sedatives without medical advice, and to seek help promptly for serious side effects. Used correctly under medical supervision, buprenorphine is a safe and effective medication, and most common side effects are mild and manageable.
Common side effects of buprenorphine
The common side effects of buprenorphine are generally those typical of opioid medications. They include headache, nausea and vomiting, constipation, sweating, dizziness, drowsiness or sleepiness, and difficulty sleeping (insomnia). With the sublingual tablets or film used for addiction treatment, some people also experience numbness, tingling, irritation, redness, or pain in the mouth or under the tongue where the medication dissolves. Other common effects can include dry mouth and back or general aches. Many of these effects are most noticeable when starting buprenorphine or after a dose change and tend to ease over time as the body adjusts, though constipation, a very common opioid effect, often persists and may need managing with diet, fluids, or a laxative recommended by your doctor.
While these common side effects are usually not dangerous, they should still be discussed with your doctor if they are troublesome or persistent, because there are often ways to manage them, such as adjusting the dose, treating constipation or nausea, or taking the medication in a way that reduces mouth irritation. Drowsiness and dizziness deserve particular care: until you know how buprenorphine affects you, avoid driving or operating machinery, and be cautious standing up, as the medication can lower blood pressure. Knowing the common side effects helps you recognise what is expected and manageable, while staying alert for the more serious effects that need prompt medical attention.
| Type | Examples | What to do |
|---|---|---|
| Common | Headache, nausea, constipation, sweating, dizziness, drowsiness, insomnia, mouth numbness | Manage with your doctor; usually not dangerous |
| Serious | Slow or difficult breathing, severe drowsiness, fainting | Seek emergency help immediately |
| Allergic | Rash, swelling of face or throat, trouble breathing | Emergency help; stop and call for help |
| Dependence/withdrawal | Withdrawal if stopped suddenly | Do not stop abruptly; taper with your doctor |
| Interactions | Worse with benzodiazepines, alcohol, sedatives | Tell your doctor; do not combine without advice |
Serious side effects and when to call a doctor
Buprenorphine can cause serious, sometimes life-threatening side effects that require urgent attention, although these are less common than with full opioids because of its ceiling effect. The most important is severe breathing problems, or respiratory depression, in which breathing becomes very slow, shallow, or difficult; this is the main danger of opioids and can be fatal, and the risk is greatly increased when buprenorphine is combined with benzodiazepines, alcohol, or other sedatives. Other serious effects include serious allergic reactions, with rash, itching, and swelling of the face, lips, tongue, or throat and trouble breathing; very low blood pressure causing fainting; liver problems, which may show as yellowing of the skin or eyes, dark urine, or upper stomach pain; and adrenal gland problems, with symptoms such as severe tiredness, weakness, and loss of appetite.
You should call your doctor promptly if you notice serious or persistent problems such as worsening drowsiness, confusion, fainting, or signs of liver or adrenal trouble, and you should seek emergency help immediately for very slow or difficult breathing, severe drowsiness or unresponsiveness, or signs of a serious allergic reaction such as swelling of the face or throat. A suspected opioid overdose, including very slow or stopped breathing and unresponsiveness, is a medical emergency: call your local emergency number and give naloxone if available. Always tell every doctor and pharmacist that you take buprenorphine, and tell them about all other medications, supplements, and alcohol use, so that dangerous combinations can be avoided. Knowing these warning signs and acting on them quickly is essential to using buprenorphine safely.
Dependence, withdrawal, and safe use
Because buprenorphine is an opioid, taking it over time leads to physical dependence, meaning the body adapts to it and stopping suddenly would cause withdrawal symptoms such as anxiety, restlessness, sweating, muscle aches, trouble sleeping, and stomach upset. This is a normal physical response and is not the same as addiction; in fact, in addiction treatment this dependence is part of how buprenorphine stabilises a person and protects against relapse. It does mean, though, that buprenorphine should never be stopped abruptly: when it is time to come off, the dose should be reduced gradually under your doctor’s guidance to keep withdrawal mild. For many people, staying on buprenorphine long term is the safest choice, and there is no need to rush to stop.
To use buprenorphine safely and minimise side effects, take it exactly as prescribed, at the prescribed dose and by the prescribed route, dissolving sublingual tablets or film fully under the tongue rather than chewing or swallowing them. Do not take more than directed or use it in non-prescribed ways, as misuse increases the risk of harm. Keep it stored securely away from others, especially children, for whom buprenorphine can be dangerous. Tell your doctor about all other medications and any alcohol use, and never combine buprenorphine with benzodiazepines, alcohol, or other sedatives without medical advice, as these combinations are the main cause of its most serious, breathing-related harms. Used this way, under medical supervision, buprenorphine is a safe and highly effective medication, and any side effects can be managed with your doctor’s help.
Summary
Buprenorphine is a partial opioid medication used to treat opioid addiction (in Suboxone and Subutex) and sometimes pain, and like all opioids it can cause side effects, though its ceiling effect makes it safer than full opioids. Common side effects include headache, nausea, vomiting, constipation, sweating, dizziness, drowsiness, insomnia, and, with sublingual tablets or film, numbness or irritation in the mouth. More serious side effects can include severe breathing problems (respiratory depression), which can be life-threatening, especially when buprenorphine is combined with benzodiazepines, alcohol, or other sedatives; serious allergic reactions; liver problems; low blood pressure and fainting; and adrenal problems. Because buprenorphine is an opioid, it causes physical dependence and withdrawal if stopped suddenly, so it should be tapered rather than stopped abruptly. Most common side effects are mild and often ease over time or can be managed, while serious effects need prompt medical attention. Call your doctor about serious or persistent problems and seek emergency help for very slow or difficult breathing, severe drowsiness, or signs of a serious allergic reaction. Tell your doctor about all medications and any alcohol use, never combine buprenorphine with other sedatives without medical advice, and take it only as prescribed. Used correctly under medical supervision, buprenorphine is a safe and effective medication.
As Dr. Ponlawat Pitsuwan, addiction medicine specialist at Phuket Island Rehab, puts it, “Buprenorphine is a remarkably safe opioid because of its ceiling effect, and most people only get the mild stuff, some nausea, constipation, a headache, that we can manage. The one thing I really hammer home is not to mix it with benzodiazepines or alcohol, because that is where the dangerous breathing problems come from. And because it is an opioid, the body depends on it, so we taper, we never stop suddenly. Honestly, for most of my patients, staying on buprenorphine is the safest place to be, and the side effects are a small price for the protection it gives.”
Frequently asked questions
What are the common side effects of buprenorphine?
The common side effects of buprenorphine are mostly those typical of opioids. They include headache, nausea and vomiting, constipation, sweating, dizziness, drowsiness or sleepiness, and difficulty sleeping, and with the sublingual tablets or film, numbness, tingling, irritation, or pain in the mouth where the medication dissolves, plus dry mouth in some people. Many of these are most noticeable when starting buprenorphine or after a dose change and tend to ease as the body adjusts, though constipation often persists and may need managing with diet, fluids, or a laxative your doctor recommends. While usually not dangerous, troublesome or persistent common side effects should be discussed with your doctor, who can often help by adjusting the dose or treating the symptom. Be cautious with driving until you know how buprenorphine affects you.
What are the serious side effects of buprenorphine?
Serious side effects of buprenorphine, though less common than with full opioids because of its ceiling effect, include severe breathing problems (respiratory depression), in which breathing becomes very slow, shallow, or difficult; this can be life-threatening and is much more likely when buprenorphine is combined with benzodiazepines, alcohol, or other sedatives. Other serious effects include serious allergic reactions with swelling of the face or throat and trouble breathing; very low blood pressure causing fainting; liver problems; and adrenal gland problems. Seek emergency help immediately for very slow or difficult breathing, severe drowsiness or unresponsiveness, or signs of a serious allergic reaction, and call your doctor promptly for other serious or persistent problems. A suspected opioid overdose is an emergency: call for help and give naloxone if available.
Is buprenorphine safer than other opioids?
Yes, buprenorphine is generally safer than full opioids such as methadone or heroin, mainly because it is a partial opioid agonist with a ceiling effect. This means that beyond a certain dose its effects, including the suppression of breathing that makes opioids deadly, level off rather than continuing to increase, which gives it a lower risk of fatal overdose than full opioids. This relative safety is a key reason buprenorphine is widely used to treat opioid addiction. However, safer does not mean risk-free: buprenorphine can still cause serious breathing problems, especially when combined with benzodiazepines, alcohol, or other sedatives, and it causes physical dependence like any opioid. So while buprenorphine is a comparatively safe opioid, it must still be taken exactly as prescribed and never mixed with other sedatives without medical advice.
Does buprenorphine cause dependence and withdrawal?
Yes. Because buprenorphine is an opioid, taking it over time causes physical dependence, meaning the body adapts and stopping suddenly would cause withdrawal symptoms such as anxiety, restlessness, sweating, muscle aches, trouble sleeping, and stomach upset. This is a normal physical response and is not the same as addiction; in addiction treatment, this dependence is part of how buprenorphine stabilises a person and protects against relapse. It does mean buprenorphine should never be stopped abruptly; when it is time to come off, the dose should be reduced gradually under your doctor’s guidance to keep withdrawal mild. For many people, staying on buprenorphine long term is the safest choice, and there is no need to rush to stop. If you want to come off, talk to your doctor about planning a safe, gradual taper.
Is it dangerous to mix buprenorphine with alcohol or other medications?
Yes, this can be very dangerous. Combining buprenorphine with alcohol, benzodiazepines, or other central nervous system depressants such as sleeping pills or muscle relaxants can dangerously suppress breathing and cause severe drowsiness, and can be fatal; these combinations are the main cause of buprenorphine’s most serious harms. Buprenorphine can also interact with certain other medications, including some that affect how it is broken down in the body. For these reasons you should tell your doctor and pharmacist about all medications, supplements, and alcohol use before and while taking buprenorphine, and never combine it with other sedatives or start new medications without medical advice. Following this guidance and taking buprenorphine exactly as prescribed greatly reduces the risk of dangerous interactions, which are among the most important hazards of the medication.
Do buprenorphine side effects go away?
Many common buprenorphine side effects do ease over time. Effects such as nausea, headache, dizziness, and drowsiness are often most noticeable when starting the medication or after a dose change and tend to settle as the body adjusts over days to weeks. Mouth numbness or irritation from sublingual tablets or film usually eases too. Constipation, however, is a common opioid effect that often persists and may need ongoing management with diet, fluids, or a laxative your doctor recommends. If side effects are troublesome or do not settle, your doctor can often help by adjusting the dose or treating the specific symptom. Serious side effects, by contrast, are not something to wait out: they need prompt medical attention. Overall, most people find buprenorphine’s common side effects manageable, especially after the first weeks, which is part of why it is well suited to long-term treatment.
Sources
Substance Abuse and Mental Health Services Administration (SAMHSA). Buprenorphine. https://www.samhsa.gov/medications-substance-use-disorders/medications-counseling-related-conditions/buprenorphine
National Institute on Drug Abuse (NIDA). Buprenorphine. https://nida.nih.gov/
Food and Drug Administration (FDA). Buprenorphine Prescribing Information. https://www.fda.gov/drugs
National Library of Medicine (MedlinePlus). Buprenorphine Sublingual. https://medlineplus.gov/druginfo/meds/a605002.html
American Society of Addiction Medicine (ASAM). National Practice Guideline for the Treatment of Opioid Use Disorder. https://www.asam.org/
World Health Organization (WHO). Opioid Overdose. https://www.who.int/news-room/fact-sheets/detail/opioid-overdose
Buprenorphine side effects — key entities and related terms
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