Contrave side effects: common vs serious risks
Contrave side effects range from nausea and constipation to serious risks like seizures and suicidal thoughts. Know what to watch for and when to get help.
Key facts
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Contrave (naltrexone and bupropion) can cause side effects that range from bothersome stomach symptoms to rare but serious safety risks. Knowing what is common versus what needs prompt medical attention can help you use it more safely. This guide summarizes Contrave side effects from FDA labeling, plus practical next steps to discuss with a clinician. If you want help applying this information to your own history and medications, Vitals Vault points you to PocketMD for personalized questions and when to seek care.
- Contrave side effects are often nausea, constipation, headache, and insomnia, but some risks are serious.
- Serious risks include seizures, suicidal thoughts or behavior, and increased blood pressure or heart rate.
- Avoid Contrave with opioids, seizure disorders, or uncontrolled high blood pressure per the FDA label.
- Seek urgent help for seizure, severe allergic reaction, or signs of opioid withdrawal after starting.
What are the main Contrave side effects?
- What it is
- A prescription combination of naltrexone and bupropion for chronic weight management.
- Common side effects (examples)
- Nausea, constipation, headache, vomiting, dizziness, insomnia, dry mouth, diarrhea.
- Serious risks (examples)
- Seizures; suicidal thoughts and behaviors; increased blood pressure and heart rate; angle-closure glaucoma; severe allergic reactions.
- Key interaction to know
- It can precipitate opioid withdrawal and blocks opioid pain medicines.
Contrave side effects: common vs serious, and what to do
Nausea
Nausea is one of the most common side effects reported with Contrave. It is often most noticeable early in treatment or after dose increases. If nausea is persistent, severe, or comes with dehydration symptoms, contact your prescriber to review options and rule out other causes.
Constipation or diarrhea
Changes in bowel habits, including constipation and diarrhea, are common. Constipation can sometimes worsen if you are eating less or not hydrating well. Tell your clinician if you have severe abdominal pain, blood in stool, or constipation that does not improve.
Headache and dizziness
Headache and dizziness can occur, especially when starting or titrating. Dizziness can raise fall risk, particularly if you also take other medicines that affect blood pressure or alertness. Seek care urgently for severe headache with neurologic symptoms, fainting, or chest pain.
Insomnia or sleep changes
Trouble sleeping and other sleep changes are reported with Contrave, consistent with bupropion effects. Sleep disruption can also worsen anxiety or irritability in some people. If insomnia is persistent or you notice agitation, racing thoughts, or mood changes, contact your clinician.
Dry mouth
Dry mouth is common and can increase thirst and dental discomfort. If dry mouth is severe, it can affect eating and oral health. Let your clinician know if you develop mouth sores, difficulty swallowing, or signs of dehydration.
Increased blood pressure or heart rate
Contrave can increase blood pressure and heart rate. This matters most if you have hypertension, heart disease risk, or you take other stimulatory medicines. Contact your clinician if you see sustained increases or develop symptoms like chest pain, shortness of breath, or severe headache.
Seizures
Bupropion can lower the seizure threshold, and Contrave is contraindicated in people with a seizure disorder. Risk can increase with certain medical conditions, alcohol or sedative withdrawal, and interacting medications. Get emergency help for any seizure or loss of consciousness.
Suicidal thoughts or behavior
Bupropion carries a boxed warning about suicidal thoughts and behaviors in children, adolescents, and young adults taking antidepressants. Even in adults, new or worsening depression, anxiety, agitation, or unusual behavior changes should be taken seriously. Seek urgent help if you or someone notices suicidal thoughts, self-harm thoughts, or severe mood changes.
Opioid withdrawal and opioid blockade
Because Contrave contains naltrexone, it can precipitate opioid withdrawal if you are physically dependent on opioids and it will block opioid pain medicines. Tell your prescriber about any opioid use, including cough medicines, diarrhea medicines, or pain treatments. Get urgent care for severe withdrawal symptoms or uncontrolled pain needs.
Angle-closure glaucoma
Bupropion can cause pupillary dilation, which may trigger angle-closure glaucoma in susceptible people. Symptoms can include eye pain, vision changes, swelling or redness in or around the eye, and headache with nausea. Seek urgent evaluation if these symptoms occur.
Severe allergic reactions
Serious hypersensitivity reactions have been reported with bupropion and naltrexone-containing products. Seek emergency care for trouble breathing, swelling of the face or throat, widespread rash, or hives. Stop taking any new dose only under medical guidance and ensure the reaction is documented.
When to call your clinician or seek urgent care
Call urgently for seizure symptoms
Get emergency help for any seizure, collapse, or loss of consciousness. This is a medical emergency and needs immediate evaluation. Tell responders you take a medicine containing bupropion and naltrexone.
Get help for suicidal thoughts
Seek urgent help if you have suicidal thoughts, self-harm thoughts, or sudden severe mood or behavior changes. Ask someone you trust to stay with you while you get help. If there is immediate danger, call emergency services.
Report sustained BP or pulse increases
Contact your clinician if you notice sustained increases in blood pressure or heart rate, or symptoms like chest pain, shortness of breath, or severe headache. Your clinician may reassess whether Contrave is appropriate and review other contributors. Do not ignore these symptoms.
Seek urgent care for eye pain or vision changes
Eye pain, halos, blurred vision, or redness with headache and nausea can be signs of angle-closure glaucoma. This needs urgent evaluation to protect vision. Mention bupropion-containing medication exposure.
Call for persistent vomiting or dehydration
If nausea or vomiting prevents you from keeping fluids down, contact your clinician promptly. Dehydration can worsen dizziness and raise other risks. Your clinician can advise on supportive care and whether to adjust the plan.
Pro tips for managing common side effects
Track patterns for 1 to 2 weeks
Note timing of nausea, headaches, sleep, and mood changes to share with your clinician.
Review all meds and supplements
Bring a complete list, including opioids, decongestants, and herbal products.
Do not ignore mood changes
New anxiety, agitation, or depression is a reason to contact your prescriber.
Ask about BP monitoring
If you have hypertension, ask how often to check blood pressure and pulse.
Plan ahead for procedures
Tell surgeons and dentists about naltrexone before any procedure needing pain control.
Frequently Asked Questions
What are contrave side effects most people notice first?
Many people notice nausea, constipation or diarrhea, headache, dizziness, dry mouth, or insomnia early on. These are listed among the most common side effects in the FDA prescribing information. If symptoms are severe or do not improve, contact your clinician.
What are the side effects of Contrave that are serious?
Serious risks include seizures, suicidal thoughts and behaviors, increased blood pressure or heart rate, angle-closure glaucoma, and severe allergic reactions. Because Contrave contains naltrexone, it can also precipitate opioid withdrawal and blocks opioid pain medicines. Seek urgent care for seizure, severe mood changes, or breathing or swelling reactions.
How long do Contrave side effects last?
Some common side effects, like nausea or sleep changes, may be more noticeable when starting or after dose increases and can improve over time. How long they last varies by person and by the specific symptom. If a side effect is persistent, worsening, or severe, contact your prescriber.
Can Contrave raise blood pressure or heart rate?
Yes. The FDA label warns that Contrave can increase blood pressure and heart rate, so monitoring may be needed, especially if you have hypertension. Contact your clinician if you develop symptoms like chest pain, shortness of breath, or severe headache.
Can I take Contrave if I use opioid pain medicine?
Contrave contains naltrexone, which blocks opioids and can trigger withdrawal if you are opioid-dependent. Tell your clinician about any opioid use, including cough or diarrhea medicines that contain opioids. If you need surgery or pain control, your care team should know you take a naltrexone-containing medication.