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

Contrave is a prescription weight-management medicine that combines two active ingredients:

• Bupropion
• Naltrexone

This guide explains how Contrave works, how it is usually taken, key safety information, and practical tips for getting the most from treatment. It is written for people in the United Kingdom and aims to be patient-friendly.

Quick overview

Basic product information

Brand name: Contrave

Active ingredients: bupropion + naltrexone

Form: oral tablets (strengths vary by stage of treatment as part of the titration schedule)

What makes it different: Contrave combines two mechanisms that together influence hunger, appetite signals, and the brain’s reward pathways related to eating.

How Contrave works (mechanism of action)

Contrave targets the brain circuits involved in hunger and reward.

Bupropion

• Bupropion is an antidepressant medicine with activity on neurotransmitters such as norepinephrine and dopamine.
• In weight management, it helps reduce appetite and can make cravings feel less intense.

Naltrexone

• Naltrexone is an opioid receptor antagonist.
• It may reduce the rewarding effects of eating and help support appetite control.

Overall effect

By combining bupropion and naltrexone, Contrave can help many people:

• Eat with better control
• Reduce hunger and cravings
• Improve adherence to a calorie-controlled diet
• Support longer-term weight loss when used as part of a structured plan

When Contrave is typically used (UK indications)

In the UK, Contrave is generally used for weight management in adults who meet specific criteria based on body weight and related health risks.

Common eligibility frameworks in clinical practice typically consider:

• Body Mass Index (BMI) and associated health conditions (such as prediabetes, type 2 diabetes risk, hypertension, or dyslipidaemia)
• The need for treatment alongside lifestyle changes (diet and physical activity)

Important: Your clinician will assess whether Contrave is suitable for you, based on medical history, current medicines, and potential risks.

Pharmacokinetics (how the body handles the medicine)

Pharmacokinetics describes absorption, distribution, metabolism, and elimination.

Absorption

• After oral dosing, bupropion and naltrexone components are absorbed through the gastrointestinal tract.
• Steady exposure is achieved gradually with consistent dosing according to the titration schedule.

Metabolism

• Bupropion is metabolised in the liver to active metabolites, including hydroxybupropion and others.
• Naltrexone is also metabolised, including to an active metabolite 6β-naltrexol.

Elimination

• Metabolites are mainly eliminated via urine (through the kidneys).
• Kidney or liver impairment can affect drug levels, so extra caution may be needed depending on your medical situation.

Why this matters for patients: Because Contrave components are processed by the liver and cleared by the body over time, consistent dosing and medication reviews are important—especially if you have other conditions or take additional medicines.

How to take Contrave (typical dosing and timing)

Contrave is started using a gradual titration schedule. This is designed to improve tolerance, particularly for nausea and other early side effects.

Typical titration approach

Your exact tablet strengths and schedule depend on the specific dosing stage. Commonly, treatment is increased in weekly steps until reaching the target maintenance dose.

Practical advice:

• Follow the titration schedule provided by your healthcare team.
• If you miss doses or stop for several days, you may need to restart the titration—ask your pharmacist or clinician.
• Do not increase the dose faster than advised.

Timing during the day

Most regimens involve taking doses in the morning and evening. Many people find it helpful to:

• Take the morning dose after breakfast (or with food if recommended for your stage of dosing)
• Take the evening dose with dinner (or after an evening meal)

Because some people experience trouble sleeping, evening dosing should be taken at the time recommended for your schedule and not too late.

With or without food

Food interactions (practical): Contrave can be taken with or without food, but many people tolerate it better with meals, especially during dose increases. If you experience nausea, taking doses with food may help.

Food interactions and dietary considerations

Contrave does not rely on a special diet to work, but how you eat can influence side effects and results.

What may help side effects

• Take with food if nausea occurs.
• Eat smaller meals if you feel overly full early in treatment.
• Stay well hydrated; constipation can occur.

What to avoid or be cautious about

• Rapid changes to calorie intake (for example, very low-calorie “crash” diets) may worsen side effects and increase fatigue or dizziness.
• Large evening meals may increase reflux or nausea for some people.

General lifestyle tip: For best outcomes, combine Contrave with a structured plan: calorie awareness, more physical activity, and support for behavioural change.

Alcohol interactions and safety

Alcohol should be treated with caution when taking Contrave.

Why alcohol needs care

• Bupropion can increase the risk of seizures in susceptible individuals.
• Alcohol can also affect seizure threshold and may worsen dizziness, drowsiness, or balance issues.

Practical guidance

• It is generally recommended to avoid heavy or binge drinking.
• If you plan to drink, keep alcohol low and avoid intoxication.
• If you stop drinking after regular heavy use, withdrawal can increase seizure risk—seek medical advice.

Seek urgent help if you experience signs of severe reaction after mixing alcohol with your medicines (e.g., fainting, confusion, severe agitation, or seizures).

Medicine interactions (what to check with your pharmacist)

Contrave can interact with other medicines because bupropion affects metabolic enzymes and because naltrexone can influence opioid-related pathways.

Medicines that commonly require extra caution

• Other antidepressants or medicines that affect serotonin/noradrenaline pathways (risk of additive effects or lowered seizure threshold depending on the combination).
• Medicines that lower seizure threshold (some antipsychotics, stimulants, and certain antibiotics can increase risk).
• Opioids (including painkillers or cough preparations containing opioids). Naltrexone may reduce opioid effectiveness and can precipitate symptoms in people dependent on opioids.
• Antiarrhythmics and medicines that affect liver metabolism may change drug levels.
• Diabetes medicines (if weight loss occurs, blood sugar may change, and medicines may need adjustment under medical supervision).

Herbal and over-the-counter products

• Be cautious with st John’s wort (an herbal antidepressant) and other supplements that may affect metabolism.
• Check with your pharmacist before using products for cold remedies, cough, or appetite, especially if they contain stimulant ingredients.

Always tell your pharmacist about all medicines you take (including those you buy without a prescription), and any recent changes.

Safety profile: key risks and who needs extra care

Like all medicines, Contrave can cause side effects. Many people experience mild-to-moderate effects that improve as dose titration continues.

Common side effects

• Nausea
• Constipation
• Headache
• Dizziness or light-headedness
• Dry mouth
• Insomnia or trouble sleeping

Less common but important warnings

Please read these carefully, because they can indicate serious reactions.

• Seizure risk: Bupropion may increase risk, particularly in people with seizure history, eating disorders (anorexia/bulimia), or other risk factors.
• Mood and behavioural changes: Like other antidepressant-related medicines, bupropion can be associated with changes in mood, agitation, or worsening depression in some people. Seek urgent help if you have suicidal thoughts or severe mood changes.
• Blood pressure: Some people experience increases in blood pressure and/or heart rate. Regular monitoring may be advised.
• Allergic reactions: Symptoms can include rash, swelling, or difficulty breathing—seek urgent help.
• Hepatic considerations: If you have liver impairment, dosing may need adjustments and careful monitoring.
• Opioid-related effects: Because Contrave includes naltrexone, it can affect the use and effectiveness of opioid medicines. Do not attempt to “push through” pain control with opioids without professional advice.

When to seek urgent medical advice

• Seizure or fainting
• Severe allergic reaction (swelling, breathing difficulty)
• Severe agitation, confusion, or signs of serotonin-like toxicity (if combined with interacting antidepressants)
• New/worsening thoughts of self-harm
• Chest pain, severe shortness of breath, or severe palpitations

Practical use tips (to improve comfort and adherence)

Contrave is most effective when taken correctly and supported by lifestyle changes. These tips can help.

1) Start low, increase slowly

The titration schedule exists for a reason. If side effects occur, do not “skip ahead” to higher doses. If symptoms are troublesome, speak to your healthcare team—your plan may be adjusted.

2) Manage nausea early

• Take doses with food during the first weeks or whenever nausea occurs.
• Smaller, more frequent meals may be easier.
• Consider gentle activity (such as walking) after meals if approved for you.

3) Prevent constipation

• Increase fluid intake.
• Ensure adequate fibre (fruit, vegetables, whole grains).
• If constipation persists, discuss suitable options with your pharmacist.

4) Protect sleep

• Take the evening dose at the time recommended by your schedule.
• Avoid late caffeine and try consistent sleep routines.

5) Track progress

Weight management is more than the scale. Consider tracking:

• Weekly weight trends (same day and time)
• Waist circumference
• Hunger/craving levels
• Steps or activity minutes

This can help you and your clinician decide whether to continue, adjust, or review the plan.

Typical follow-up and treatment goals

In weight management, medicines are usually reviewed at set points to check whether they are helping and whether side effects are manageable.

Many programmes assess:

• Your progress after the dose increases phase
• Whether you have achieved clinically meaningful weight reduction
• Your tolerance of the medicine

Important: Do not stop or change treatment without medical advice. If you experience significant side effects, contact your pharmacist or clinician promptly for guidance.

Alternative options (other ways to manage weight)

Depending on your health, preference, and availability, alternatives may include:

Other prescription weight-loss medicines

• GLP-1 receptor agonists (for example, medicines used for type 2 diabetes that also support weight loss, depending on eligibility)
• Other appetite-modulating medicines or metabolic therapies (subject to local clinical criteria)

Non-medicinal options

• Dietary interventions (structured calorie deficit, nutrition plan tailored to you)
• Physical activity (a mix of aerobic activity and resistance training where suitable)
• Behavioural support (goal setting, coping strategies, addressing triggers for overeating)
• Weight management programmes through NHS services or local providers

Your healthcare team can advise on which option best fits your medical history and lifestyle.

Market and legal context in the UK (what to expect)

In the UK, Contrave is an established medicine for weight management in selected adult patients. Use is governed by:

• UK medicines regulations and product licensing requirements
• NHS clinical practice and local weight-management pathways
• Safety monitoring expectations (including review of benefits and risks)

In addition, prescribing and supply practices may be influenced by service commissioning and eligibility criteria across NHS and private healthcare pathways.

Recent guidance and evolving practice

Weight-management recommendations in the UK continue to evolve, with increasing focus on:

• Structured lifestyle programmes alongside medicines
• Patient selection based on BMI and comorbidities
• Regular review of response and tolerability
• Long-term planning to reduce weight regain

Your clinician may also consider updated evidence on efficacy, safety, and the broader availability of alternative medicines.

Delivery and availability (UK)

Availability of Contrave can vary by supplier and stock levels. For online pharmacy purchasing in the UK, delivery is typically offered to mainland addresses subject to:

• Prescription verification and eligibility checks within the pharmacy workflow
• Stock status and dispatch times
• Courier schedules and standard UK delivery options

What to check before ordering:

• That you can receive deliveries where you live (e.g., safe place or parcel collection options)
• Estimated dispatch and delivery times shown at checkout
• Any requirements for age verification or identity checks (if applicable)
• Returns and missed delivery policy

Storage: Store tablets according to the label instructions—typically in a cool, dry place and out of sight of children.

FAQ – Frequently asked questions

1) How long does it take to feel an effect from Contrave?

Some people notice changes in appetite or cravings within the first couple of weeks, while others may feel effects only after reaching the maintenance dose. Weight loss is usually gradual, and lifestyle changes strongly influence results.

2) What should I do if I miss a dose?

If you miss a dose, follow the guidance provided by your pharmacy or the patient information leaflet for your specific schedule. In general, avoid doubling up unless told to do so. Because Contrave is titrated, your next step may depend on how many doses were missed.

3) Can I drink alcohol while taking Contrave?

Light or occasional alcohol may be possible for some people, but heavy drinking is not recommended. Alcohol can increase risks such as dizziness and may affect seizure risk. If you are unsure, ask your pharmacist for personalised advice based on your history.

4) Does Contrave interact with painkillers?

Contrave contains naltrexone, which can affect opioid painkillers (for example morphine, oxycodone, or codeine). Tell your clinician and pharmacist about all pain medicines you use so they can choose safe options.

5) Why is Contrave increased gradually?

The gradual “titration” schedule helps reduce early side effects, particularly nausea and sleep-related issues. Increasing too fast can make side effects more likely or more severe.

6) Is Contrave suitable for everyone?

No. Suitability depends on medical history (including seizure risk, mood-related history, liver or kidney impairment), other medicines, and factors such as pregnancy or breastfeeding status. Your pharmacist or clinician will assess whether it is appropriate for you.

7) What are the most common side effects?

Common side effects include nausea, constipation, headache, dizziness, dry mouth, and insomnia. These often improve over time, especially if you take the medicine with food and follow the titration schedule.

8) What should I do if I get severe nausea or vomiting?

If symptoms are severe, persist, or you cannot keep fluids down, contact your pharmacist or clinician promptly. Severe dehydration can become serious and may require urgent assessment.

9) Can I take Contrave with other weight-loss products?

Be cautious. Some supplements or stimulant products may increase side effects or interact with your medicine. Ask your pharmacist before combining Contrave with any over-the-counter weight-loss products.

10) What if I have diabetes or take glucose-lowering medicines?

Weight loss may change blood sugar levels. Do not adjust diabetes medicines on your own—speak to your clinician about whether monitoring or dose changes are needed to reduce the risk of low blood sugar.

Summary

Contrave (bupropion + naltrexone) is used in the UK as part of a structured weight-management approach for suitable adults. It works by influencing brain pathways related to hunger, cravings, and eating rewards. Treatment begins with a gradual dose increase, with ongoing review to confirm benefit and manage side effects. For safe use, it’s important to follow the recommended schedule, take doses in line with guidance on food timing, and carefully consider alcohol and medicine interactions.