Contrave (Bupropion + Naltrexone) – Patient Guide (UK)

Contrave is a weight-management medicine that combines two active ingredients: bupropion and naltrexone. It is designed to help adults who are overweight or living with obesity achieve healthier weight loss, alongside lifestyle changes such as diet and physical activity.

This guide explains how Contrave works, how it’s typically taken, important safety information, and practical tips. It also includes UK-focused considerations around availability and current prescribing practice.

Basic product information

• Brand name: Contrave
• Active ingredients: bupropion + naltrexone
• Purpose: weight management in adults with excess weight
• Form: extended-release tablets (commonly provided in a step-up schedule)
• Availability: commonly supplied via UK pharmacies when clinically appropriate

Note: Product presentation, tablet strengths, and titration schedules can vary by country and supply. Always follow the specific instructions provided with your medicine.

How Contrave works (mechanism of action)

Contrave combines two medicines that affect appetite regulation and reward pathways in the brain. Together, they help support weight loss by targeting both:

• Appetite and cravings: bupropion influences neurotransmitters involved in appetite and energy balance, helping reduce hunger and reduce “food noise” for some people.
• Reward-driven eating: naltrexone helps modulate the brain’s response to reward signals, which may reduce cravings and the reinforcing effects of eating.

Weight loss results are typically gradual and are usually strongest when the medicine is combined with a structured lifestyle plan.

Pharmacokinetics (what the body does to the medicines)

Understanding pharmacokinetics can help explain why Contrave is taken at specific times and why dose increases (“titration”) are often used to improve tolerability.

Key points (general)

• Extended release: The tablets are designed to release medicine over time, which helps maintain steadier blood levels and may reduce side effects compared with immediate-release dosing.
• Bupropion metabolism: Bupropion is metabolised in the liver. A key active metabolite is hydroxybupropion, which also contributes to the overall effect.
• Naltrexone exposure: Naltrexone is also metabolised and forms an active metabolite (commonly described as 6β-naltrexol).
• Half-life (broadly): Both components have clinically relevant durations that support once- or twice-daily schedules depending on the titration stage and product instructions.

Individual exposure can vary with age, liver function, other medicines, and smoking status. Your healthcare professional may adjust plans accordingly.

Typical use and who it’s for

Contrave is used for weight management in adults with:

• Body Mass Index (BMI) that meets clinical criteria for weight-related risk, and
• A need for weight loss supported by a comprehensive lifestyle programme.

In the UK, the suitability of Contrave depends on your health profile, previous weight-loss attempts, other medications, and safety factors (for example, seizure risk or certain mental health conditions).

Important: Contrave is not intended for use in children or adolescents.

Indications (what it’s indicated for)

Contrave is indicated as an adjunct to a reduced-calorie diet and increased physical activity for weight management in appropriately selected adults.

Your clinician will assess whether you’re likely to benefit, including how you respond during the first weeks of treatment. Some pathways use early response checkpoints to guide whether to continue.

Dosing and timing (step-up schedule)

Contrave is commonly started using a gradual step-up (titration) to improve tolerability, especially for nausea, headaches, and sleep-related side effects.

Because step-up schedules can differ by product/pack, always use the exact schedule supplied with your medication. If you’re unsure, ask your pharmacist to confirm your dosing plan.

General timing guidance

• Take tablets at consistent times each day.
• Evening dosing: For some people, late dosing can affect sleep. If you notice insomnia, your clinician may advise adjusting timing within the recommended schedule.
• With or without food: Follow the product instructions; many people take it with meals to reduce stomach upset.

What to do if you miss a dose

• If you miss a dose, take it when you remember unless it is close to your next dose.
• Do not take extra tablets to make up for a missed dose.

If you’re unsure, speak to a pharmacist for advice based on your stage of titration.

Food interactions and eating habits

Contrave can usually be taken with or without food, but food may influence how comfortable you feel during the first few weeks.

Practical guidance

• If you get nausea, try taking your dose with a meal or a snack.
• Stay hydrated, especially if you’re also reducing calorie intake.
• Focus on sustainable, balanced choices. The medicine supports weight management, but it doesn’t replace a diet plan.

There are no widely required “special foods” to avoid. However, alcohol and certain medicine interactions deserve extra attention (see below).

Alcohol and medicine interactions

Combining Contrave with alcohol requires caution because both bupropion and naltrexone can affect the brain and liver, and alcohol may increase side effects such as dizziness or impaired coordination.

Alcohol

• Limit alcohol during treatment, and avoid heavy or binge drinking.
• If you have liver problems or are at higher risk of liver disease, discuss alcohol use with a healthcare professional.
• Seek advice promptly if you experience severe dizziness, confusion, unusual agitation, or vomiting after mixing.

Medicine interactions (common categories)

Contrave can interact with other medicines, mainly due to how bupropion affects liver enzymes and due to central nervous system effects.

• Seizure-threshold lowering medicines: combining with medicines that can increase seizure risk may be unsafe.
• Other antidepressants or medications affecting dopamine/noradrenaline: risk of additive side effects may increase.
• Opioids: naltrexone can interfere with opioid analgesics and opioid-containing cough medicines. This can reduce pain relief or affect opioid use.
• Medicines for alcohol dependence or opioid use disorder: discuss carefully with a clinician due to opioid-blocking effects.
• Monoamine oxidase inhibitors (MAOIs): this combination is typically avoided.
• Some anti-epileptics and antipsychotics: may require careful review of suitability.
• Warfarin: occasional monitoring may be needed because of potential interaction pathways.
• Other liver-metabolised medicines: dose adjustments may be required depending on the medicine.

Always provide your pharmacist with a complete list of medicines, including over-the-counter products and herbal supplements.

Safety profile (important warnings)

Like all medicines, Contrave can cause side effects. Most are mild to moderate and improve as your body adjusts, particularly during the titration phase.

Common side effects

• Nausea
• Headache
• Dry mouth
• Constipation
• Dizziness
• Insomnia or sleep disturbance
• Increased blood pressure and heart rate (in some people)

Serious but less common risks

• Seizures: bupropion can increase seizure risk, particularly in people with certain risk factors.
• Severe allergic reactions: seek urgent help if swelling, rash, or breathing difficulties occur.
• Changes in mood: any new or worsening depression, agitation, or unusual behaviour should be discussed promptly.
• Suicidal thoughts: if you experience suicidal thoughts or severe mood changes, seek urgent medical attention immediately.
• Blood pressure/heart rhythm: monitoring may be recommended.

Who should be especially cautious

Contrave may not be suitable or may require extra checks if you have any of the following (examples):

• A history of seizures or conditions that raise seizure risk
• Eating disorders (such as bulimia or anorexia nervosa)
• Significant liver disease
• Current or past heavy use of alcohol or sudden alcohol withdrawal
• Use of medicines that conflict with bupropion/naltrexone safety considerations
• Major psychiatric conditions that require careful assessment

This list is not exhaustive. If you have any medical conditions or take other medicines, check with your pharmacist/clinician.

Practical use tips (to get the best from treatment)

• Use the titration schedule strictly: speeding up your increase can increase side effects.
• Plan for the first weeks: nausea or headaches are more likely early on. Eating with food and staying hydrated can help.
• Monitor your wellbeing: keep an eye on mood, sleep, and any unusual symptoms.
• Keep blood pressure checked: many weight-management medicines can affect blood pressure and heart rate.
• Track weight and habits: weekly weigh-ins plus notes on diet/activity can help you and your clinician assess progress.
• Stay consistent with lifestyle changes: Contrave is an adjunct; results typically depend on the broader plan.
• Don’t mix with unsafe opioid strategies: naltrexone can interfere with opioid pain medicines. If you anticipate surgery or dental procedures, tell your healthcare team that you take Contrave.

How long until you see results?

Weight changes often begin gradually. Some people notice changes in appetite relatively early, while weight loss depends on calorie deficit and individual response.

UK guidance in practice may involve reassessing progress after an initial period. If targets are not met, your clinician may discuss whether to continue.

Alternative options for weight management (UK context)

There are several approaches to weight management, depending on medical suitability, access routes, and preferences. Alternatives may include:

• Lifestyle programmes: structured diet, physical activity, behaviour change support, and sometimes weight-loss programmes.
• Other weight-loss medicines: different mechanisms (for example appetite suppressants or hormone-based options where eligible).
• Referral options: specialist-led obesity management services may be available depending on circumstances.
• Supportive therapies: addressing sleep, stress, and underlying conditions such as insulin resistance or sleep apnoea.

Availability and eligibility vary. If Contrave isn’t suitable or doesn’t work well for you, ask your clinician or pharmacist about other options.

Market/legal context for the UK (what to expect)

In the UK, medicines are regulated and monitored through the Medicines and Healthcare products Regulatory Agency (MHRA), with additional prescribing and funding guidance provided by healthcare systems and clinical bodies.

Weight-management prescribing may differ between settings (primary care, specialist services, and private pathways). Your access to Contrave depends on:

• Clinical eligibility based on your health status
• Assessment of risk factors (including seizure risk and opioid use)
• Local availability and supply arrangements

If you’re looking to obtain Contrave through a UK pharmacy, ensure you have the appropriate clinical assessment and follow the dosing schedule provided with your supply.

Recent guidance (how practice is evolving)

Weight-management practice in the UK continues to evolve as new medicines and updated local pathways are introduced. In general, modern approaches emphasise:

• Individual risk assessment before starting treatment
• Lifestyle changes from day one (diet, activity, behaviour support)
• Review of progress to decide whether to continue, adjust, or switch strategies
• Monitoring for safety, including blood pressure and neuropsychiatric symptoms where relevant

For the most current advice, your prescriber and pharmacist will follow the latest product information and UK clinical guidance.

Delivery and availability in the UK

Availability can vary depending on stock levels, regional distribution, and packaging. Many online pharmacies offer home delivery where permitted by law and regulation.

What to check before ordering

• Confirm the exact product and strength you will receive.
• Check delivery times and whether cold-chain storage is required (most tablets do not require special temperature storage).
• Ensure you can start promptly so you can follow the titration schedule without interruption.
• Keep the medicine in a safe place away from children and moisture.

If you need the medicine for long-term use, consider ordering early to reduce the risk of running out.

FAQ

1) Is Contrave the same as bupropion or naltrexone taken alone?

No. Contrave is a combination medicine containing both bupropion and naltrexone in an extended-release form. The combination is intended to provide a specific appetite/reward effect used in weight management.

2) When should I take Contrave?

Follow the schedule provided with your medication. Many people find it helpful to take doses at similar times each day, with food if nausea occurs. If you experience insomnia, talk to your pharmacist about timing adjustments within the recommended plan.

3) Can I take Contrave with food?

Usually yes. If you get stomach upset, taking it with a meal may help. Always follow the instructions on your medicine label.

4) Can I drink alcohol while taking Contrave?

It’s best to limit alcohol and avoid heavy/binge drinking. Alcohol may increase dizziness and side effects and can affect safety in certain people. If you’re unsure, ask a pharmacist or clinician, especially if you have liver issues or a history of problematic alcohol use.

5) What if I’m taking pain relief or other medicines?

Tell your pharmacist about everything you take. In particular, opioid-containing pain medicines may be affected by naltrexone. Some combinations also influence seizure risk or blood pressure—so a full review is important.

6) What side effects are most common?

Common side effects include nausea, headache, dry mouth, constipation, dizziness, and sleep disturbance. Many people find these improve after the first few weeks.

7) Should I stop Contrave if I feel unwell?

Do not stop abruptly without advice, but seek urgent help if you have severe symptoms (such as seizures, allergic reactions, or serious mood changes). If side effects are persistent or troubling, contact your clinician/pharmacist for guidance.

8) Who should not take Contrave?

Suitability depends on individual risk factors. Contrave may be unsuitable for people with certain seizure risk factors, specific eating disorders, significant liver disease, or who take conflicting medicines. Your pharmacist/clinician can screen for these.

9) How do I maximise the chance of success?

Combine Contrave with a reduced-calorie diet and increased physical activity, and use a structured approach (goal setting, weekly weigh-ins, and practical behaviour strategies). Consistency during titration is key.

10) What are my weight-loss expectations?

Results vary. Some people experience reduced appetite sooner, while weight loss depends on adherence to calorie reduction and lifestyle changes. Progress should be reviewed with your healthcare professional after an initial period.

Summary

Contrave (bupropion + naltrexone) is an adjunct treatment for weight management in appropriately selected adults in the UK. It works by targeting brain pathways involved in appetite and food reward, supporting healthier eating habits and gradual weight loss.

If you’re considering Contrave, the most important next steps are to confirm suitability based on your medical history, follow the titration schedule carefully, monitor for side effects, and pair treatment with a sustainable diet and activity plan.