Contrave® (Bupropion + Naltrexone) – Patient Guide (Australia)

Contrave® is a weight-management medicine that combines two active ingredients: bupropion and naltrexone. It is designed to help adults with weight-related conditions achieve meaningful weight loss when used alongside a reduced-calorie diet and increased physical activity.

This guide explains how Contrave works, how it’s taken, key safety considerations, common questions, and practical tips. It is written for people in Australia and includes general information about availability and regulatory context.

Quick facts

• Brand: Contrave®
• Active ingredients: Bupropion + Naltrexone
• Used for: Weight management in adults with excess weight and related health risks, as well as selected body-mass index (BMI) criteria
• Key approach: Lifestyle changes + ongoing use (if effective and tolerated)
• How it’s taken: Gradual dose increase (“titration”) to reduce nausea and improve tolerance
• Common side effects: Nausea, constipation, headache, dizziness, dry mouth, insomnia

Basic product information

What is Contrave? Contrave is an oral combination medicine containing:

• Bupropion – an antidepressant and smoking-cessation medicine classed as a norepinephrine–dopamine reuptake inhibitor (NDRI).
• Naltrexone – an opioid receptor antagonist.

What forms are available? In many markets, Contrave is supplied as extended-release tablets that are taken multiple times daily according to a titration schedule. Product strengths and schedules can vary by country formulation, so always follow the dose instructions provided with your specific product.

How it should be used: Contrave is intended for ongoing weight management. It is not a quick “detox” or short-term weight-loss tablet. The aim is gradual, sustained weight reduction supported by diet, activity, and behavioural strategies.

How Contrave works (mechanism of action)

Contrave targets appetite and cravings through combined actions on brain pathways involved in energy regulation and reward. In simple terms, it helps you feel less hungry and may reduce food cravings.

Bupropion’s role

• Increases signalling of norepinephrine and dopamine in the brain.
• May help reduce appetite by influencing satiety and motivation pathways.
• May also affect energy balance and behavioural responses to food.

Naltrexone’s role

• Blocks opioid receptors, which are involved in reward and reinforcement.
• May reduce the pleasurable/reward-related drive to eat, especially for certain highly palatable foods.

Combined effect: Together, bupropion and naltrexone act on hypothalamic and mesolimbic pathways to support reduced calorie intake and improved adherence to lifestyle changes.

Pharmacokinetics (how the body handles it)

Pharmacokinetics describes absorption, distribution, metabolism, and elimination.

Absorption and time to effect

• Contrave is taken by mouth in divided doses using an extended-release formulation.
• After each dose, active ingredients reach peak levels at varying times depending on the formulation.
• Weight changes typically develop over weeks as treatment continues and lifestyle changes take effect.

Metabolism

• Bupropion is metabolised primarily in the liver to active and inactive metabolites.
• Naltrexone is metabolised to 6β-naltrexol.

Elimination

• Metabolites are eliminated mainly via urine (and to some extent other routes).
• Dose adjustments may be needed for certain liver/kidney conditions; the usual approach depends on local prescribing guidance and your clinician’s assessment.

Patient note: Individual response and side effects can vary. Titration is used to help your body adjust, improving tolerability.

Typical use and who it is for

Contrave is generally used for weight management in adults who meet specific criteria based on BMI and related risk factors. It is intended to be used together with:

• A reduced-calorie diet
• Regular physical activity
• Behavioural strategies to support long-term changes

Important: Contrave may not suit everyone. Suitability depends on medical history, current medicines, and risk factors (for example, seizure risk, alcohol use, and opioid use).

When to take Contrave (timing and titration)

Contrave is typically started with a titration schedule to reduce nausea and other early side effects. The dose increases gradually over several weeks until reaching a maintenance dose.

General timing tips

• Take tablets at the times specified in the titration plan.
• Try to keep dosing times consistent day to day.
• If it causes insomnia or restlessness, ask your pharmacist or doctor about adjusting the timing within the prescribed schedule (do not change dose frequency on your own).

Example of a titration approach (illustrative)

Exact schedules can differ by formulation. Always follow the printed label and clinician instructions for your specific product.

If you miss a dose: Do not double up to “catch up.” Instead, follow the instructions provided with your medicine or check with a pharmacist for advice based on how long it’s been since the missed dose.

Food interactions (taking Contrave with meals)

Food can influence tolerability and, in some cases, absorption. Many people find it easier to take Contrave with food if they experience nausea.

Practical guidance

• Take with meals if nauseated (unless your product instructions specify otherwise).
• Avoid large, very high-fat meals close to dosing if nausea is a problem.
• Stay well hydrated (constipation can occur).

Alcohol and meals

Alcohol can increase the risk of side effects and may increase seizure risk in susceptible individuals (see “Alcohol interactions” below).

Alcohol and medicine interactions

Alcohol

Limit or avoid alcohol while taking Contrave unless your clinician has advised otherwise. Bupropion can increase seizure risk, and excessive alcohol intake or alcohol withdrawal can further raise risk.

• Avoid heavy drinking or binge patterns.
• If you have a history of alcohol dependence, discuss this before starting.
• Be extra cautious if you also take other medicines that affect brain function.

Common medicine interaction themes

Contrave can interact with medicines that influence seizure threshold, blood pressure/heart rate, or opioid receptors.

1) Medicines that lower seizure threshold

• Some antidepressants, stimulants, antipsychotics, systemic steroids at higher doses, and certain other medicines can increase seizure risk.
• Risk may be higher with alcohol withdrawal and eating disorders.

2) Opioid-containing medicines

• Naltrexone blocks opioid receptors. This can reduce the effect of opioid pain medicines or cause withdrawal symptoms if opioids are present.
• Inform your healthcare provider if you use opioid analgesics, opioid cough syrups, or opioid replacement therapies.

3) Blood pressure and heart rate–affecting medicines

• Bupropion may raise blood pressure or heart rate in some people.
• If you take antihypertensives, stimulants, thyroid hormones, or other cardiovascular medicines, monitoring may be needed.

4) Other antidepressants or MAOIs

• Combination with certain antidepressants (especially MAO inhibitors) may be unsafe.
• Always provide your full medication list to your pharmacist.

What you should do

• Tell your pharmacist about all medicines, including over-the-counter products, vitamins, herbal supplements, and as-needed medications.
• Bring a list of current prescriptions to avoid missing key interactions.

Indications (why clinicians may recommend it)

Contrave is indicated for weight management in adults with excess body weight who also have weight-related health risks and meet BMI criteria, as determined by local prescribing standards. It is intended as part of a comprehensive weight management plan including diet and activity.

Not intended for:

• Children or adolescents
• Short-term “quick loss” programmes
• Use without lifestyle changes

Assessment of response: Clinicians commonly review progress at regular intervals and may discontinue if the treatment is not effective or not tolerated.

Dosing (how Contrave is taken)

Dosing is typically increased gradually. Always use the schedule provided with your medicine and follow guidance from your healthcare professional.

General dosing principles

• Titration: Start low and increase weekly over several weeks.
• Maintenance: Continue at the recommended effective dose if tolerated.
• Do not exceed the prescribed dose.
• Swallow tablets whole (do not crush or break unless your specific product instructions allow it).

If you have liver or kidney problems

People with significant liver disease or kidney impairment may require special consideration. Your pharmacist can advise which questions to ask your prescriber based on your history.

Safety profile (who should be cautious and what to watch)

Like all medicines, Contrave can cause side effects. Many are mild to moderate, especially early during titration, but some can be serious.

Common side effects

• Nausea
• Constipation
• Headache
• Dizziness
• Dry mouth
• Insomnia or sleep disturbance

Serious warnings (seek medical advice urgently)

• Seizures: Contact urgent medical services if a seizure occurs.
• Allergic reactions: swelling of face/lips, breathing difficulties, widespread rash.
• Severe mood changes: new or worsening depression, agitation, or suicidal thoughts.
• Significant blood pressure rise or chest pain.
• Serious opioid-related concerns: if you use opioid medicines, contact your healthcare provider for safe planning.

Situations that increase risk

• History of seizures or conditions that raise seizure risk
• Eating disorders (such as bulimia or anorexia)
• Regular heavy alcohol use or alcohol withdrawal
• Certain medication combinations (especially those that lower seizure threshold)
• Uncontrolled high blood pressure or certain heart conditions (requires clinician assessment)

Driving and machinery

Some people experience dizziness or sleep disturbance. Until you know how Contrave affects you, take care when driving or operating machinery.

Practical use tips (making it easier to succeed)

1) Manage nausea early

• Take doses with food if nausea occurs.
• Stay hydrated and eat smaller meals.
• Follow the titration schedule—skipping steps can increase side effects.

2) Prevent constipation

• Increase fibre gradually (vegetables, fruit, wholegrains).
• Drink adequate water.
• Consider discussing an appropriate stool-softening option with your pharmacist if needed.

3) Support sleep

• If you’re sensitive to insomnia, take doses earlier in the day according to your prescribed timing.
• Limit caffeine, especially in the afternoon and evening.

4) Track progress realistically

• Weigh yourself consistently (for example, weekly) and record results.
• Track waist measurements and physical activity too.
• Weight loss may not be linear—consistency matters.

5) Don’t change meds without advice

• Inform your pharmacist before starting new medicines, including pain relievers and sleep aids.
• If you require opioid pain relief, urgent coordination is needed due to naltrexone’s opioid-blocking effects.

Alternative options for weight management

Depending on your health profile and availability in Australia, other evidence-based options may include lifestyle programmes, dietitian-led plans, and other prescription weight-management medicines.

Non-medicine options

• Structured calorie deficit plans
• Behavioural support (goal setting, habit tracking)
• Physical activity (aerobic + resistance training)

Other medicine categories (general information)

• GLP-1 receptor agonists and related therapies (used for weight management in appropriate patients)
• Other appetite or metabolic medicines depending on eligibility and local availability

Talk to your pharmacist or clinician about options that best match your medical conditions, risk factors, and treatment goals.

Market and legal context in Australia (overview)

In Australia, weight-management medicines may be subject to prescription and pharmacy regulation. Availability and access can change based on regulatory decisions and Pharmaceutical Benefits Scheme (PBS) listings where applicable. Counterfeit products are a risk online, so it’s important to buy from a reputable Australian pharmacy.

Safety and quality: In Australia, medicines must meet manufacturing and quality standards under Australian regulatory frameworks. Legitimate suppliers provide correct packaging, patient information, and appropriate dispensing safeguards.

Recent guidance (general trend): Australian weight-management guidance increasingly emphasises:

• Individualised eligibility based on BMI and comorbidities
• Ongoing monitoring of effectiveness and adverse effects
• Combination with diet, activity, and behaviour change

Local clinical practice may involve periodic review of blood pressure, mental health symptoms, and tolerability during dose escalation.

Delivery and availability (Australia)

Contrave availability can vary depending on stock levels and prescribing requirements. If you’re ordering online:

• Choose an Australian-licensed pharmacy site.
• Confirm whether the pharmacy can supply the specific product strength and pack size.
• Check delivery timeframes and whether the pharmacy provides tracking.
• Allow time for processing if dose titration requires multiple pack sizes.

Storage at home: Keep tablets in their original packaging, protected from moisture and heat, and out of reach of children. Follow the storage directions on the label.

FAQ

1) How long does it take for Contrave to work?

Many people notice reduced appetite within the first few weeks, but weight loss typically becomes more apparent over several weeks to months. The most important factor is consistency with lifestyle changes and tolerating the full dose schedule.

2) What should I do if I can’t tolerate the side effects during titration?

Do not stop or change the schedule without advice. Contact your pharmacist for guidance. Sometimes adjusting how you manage nausea (timing with food, hydration, constipation prevention) can help. Your clinician may decide whether to slow titration if needed.

3) Can I drink alcohol while taking Contrave?

It’s best to limit or avoid alcohol. Alcohol can increase certain risks associated with bupropion, particularly seizure risk in susceptible individuals, and may worsen side effects. Ask a pharmacist if you’re unsure about your situation.

4) Will Contrave interact with pain medicines?

Yes. Because Contrave contains naltrexone, it can reduce or block the effect of opioid pain medicines and may cause withdrawal symptoms if opioids are in your system. Always disclose your pain medicine plan to your pharmacist.

5) Is Contrave safe for everyone?

No. Contrave may be unsuitable for people with certain seizure risks, specific eating disorders, uncontrolled hypertension, or those who use opioids. A medication and health history review is important to determine suitability and monitor risk.

6) Can I take Contrave with other antidepressants?

Some antidepressants and other central nervous system medicines may interact or increase side effects. Provide your full medication list to your pharmacist so they can check for clinically important interactions.

7) What if I miss a dose?

Follow the missed-dose instructions provided with the product or ask a pharmacist. In general, you typically should not double doses to make up for a missed tablet.

8) Does Contrave affect blood pressure?

In some people, bupropion-containing products can raise blood pressure and/or heart rate. Monitoring may be recommended—especially if you have a history of hypertension or take cardiovascular medicines.

9) Can I take Contrave if I have constipation?

Constipation is a common side effect. If you’re prone to constipation, discuss management strategies with your pharmacist before starting. During treatment, focus on fluids and fibre and seek advice for persistent symptoms.

10) What happens if I stop Contrave?

Stopping may reduce the appetite/craving effects. Weight management still relies on diet, activity, and behaviour. If you want to stop or switch treatments, discuss it with your clinician to plan safely.

Disclaimer: This page provides general, patient-friendly information about Contrave (bupropion + naltrexone). It does not replace advice from a healthcare professional. Always read the consumer medicine information provided with your product and seek advice for questions specific to your health, medications, and risks.