Contrave for Weight Loss — Complete Guide

Most weight loss medications fit neatly into one of two categories: suppress your appetite or slow your gut. Contrave doesn't do either of those things.

It works on your brain's reward system. The cravings you have for food (especially the emotional ones, the late-night ones, the ones that show up when you're bored or anxious) are driven by dopamine and opioid pathways. Contrave targets exactly those pathways. That's what makes it different from the GLP-1 drugs that get most of the attention right now.

If you've tried calorie restriction and it works until you're standing in front of the fridge at 10 PM, this article is for you. Here's an honest look at what Contrave does, what the clinical trials actually showed, who it works for, and what it costs.

Important safety notice: Contrave carries a boxed warning (the FDA's strongest warning label) for increased risk of suicidal thoughts and behaviors. This risk is associated with the bupropion component. Tell your provider immediately if you experience mood changes, new or worsening depression, or thoughts of self-harm while taking Contrave.

What Is Contrave?

Contrave is an FDA-approved oral medication for chronic weight management. It combines two existing drugs in a single tablet: naltrexone (8 mg extended-release) and bupropion (90 mg extended-release).

The FDA approved Contrave in September 2014 under NDA200063. It's manufactured by Nalpropion Pharmaceuticals LLC. The approval is for adults with a BMI of 30 or higher, or a BMI of 27 or higher with at least one weight-related condition such as high blood pressure, type 2 diabetes, or high cholesterol. It's indicated alongside a reduced-calorie diet and increased physical activity (FDA, 2014).

Neither component is new. Bupropion has been prescribed for depression and smoking cessation under brand names Wellbutrin and Zyban for decades. Naltrexone is used to treat opioid and alcohol use disorders. The insight behind Contrave was that combining them at specific doses produces significantly more weight loss than either drug alone, and does it through a mechanism that specifically addresses food cravings and reward-driven eating (Padwal, 2009). The complementary mechanism was first characterized in the chemical neuroscience literature before the FDA approval (Mercer, 2011).

How Contrave Works: The Neuroscience of Cravings

Here's where Contrave gets interesting. Your brain has a built-in reward circuit that makes eating feel good. That's not a bug. It's how your body ensures you eat enough to survive. The problem is that modern food is engineered to hijack this circuit, and for many people, the "I'm done eating" signal never quite arrives.

Bupropion works by blocking the reuptake of norepinephrine and dopamine. More of those neurotransmitters stay active in your synapses, which reduces appetite and suppresses the reward signal you get from food. On its own, bupropion produces some weight loss, roughly 2-5% body weight compared to placebo (Ornellas & Chavez, 2011).

Naltrexone is an opioid receptor antagonist. It blocks the opioid receptors in your brain that generate that pleasurable feeling when you eat highly palatable food. Without that reward signal, your brain's drive to eat for pleasure decreases.

Here's the key: in a specific area of the hypothalamus (your brain's appetite control center), there are neurons called POMC neurons (pro-opiomelanocortin neurons). Bupropion activates these neurons, which reduces appetite and increases energy expenditure. But there's a feedback problem: when POMC neurons activate, they also release beta-endorphin, which then signals back and shuts the neurons off.

Naltrexone blocks that shutdown signal. It lets the POMC neurons stay activated longer, reinforcing bupropion's effect. Together, the two drugs work on appetite, food reward, and the emotional compulsion to eat in a way that neither drug achieves separately (Mercer, 2011). Clinical reviews confirmed this synergistic mechanism was the primary rationale for the combination (Sherman et al., 2016).

As Dr. Dan put it in his clinical review: "In practice, I found my clients really note that they're able to be more mindful with their choices. They're kind of able to slow down and pick the apple over the apple pie more frequently."

The COR Trial Data: What the Science Shows

Contrave was tested in four Phase III randomized, double-blind, placebo-controlled trials before FDA approval. These are known as the COR trials (Contrave Obesity Research). A total of 4,536 patients across these trials were randomized to either Contrave or placebo, making this one of the more extensively studied oral weight loss medications available (Sherman et al., 2016).

COR-I and COR-II were the foundational efficacy trials. In participants who completed the full treatment period, Contrave produced significantly greater weight loss than placebo. Across the trial program, Contrave users lost approximately 5-9% of their starting body weight compared to placebo (Sherman et al., 2016).

To put that in human terms: if you start at 220 pounds, 5-9% means losing 11 to 20 pounds compared to diet alone.

COR-BMOD (the Behavioral Modification trial) is the one that shows Contrave's real potential when used properly. This trial combined Contrave with intensive lifestyle intervention: diet counseling, exercise coaching, and behavioral modification. The result was an 11.3% reduction in body weight from baseline in the Contrave plus intensive lifestyle group, compared to 7.3% in the placebo group doing the same intensive lifestyle program (Wadden et al., 2013, as reported in the COR-BMOD primary analysis).

That 4% difference represents roughly 8-9 pounds of additional weight loss on top of what intensive lifestyle intervention alone achieves. That's meaningful.

COR-Diabetes specifically looked at participants with type 2 diabetes, a harder population because several diabetes drugs promote weight gain. The trial still demonstrated significant weight loss with Contrave in this group, with meaningful reductions in HbA1c alongside weight (Sherman et al., 2016). This data was included in the FDA's approval decision (Duah & Seifer, 2025).

A population pharmacodynamic model analyzing data from six Contrave trials (n=4,591 subjects) confirmed that body weight change is a key predictor of treatment response and adherence. The people who respond early tend to stay on it (Sharma et al., 2017).

One important framing note: the 5-9% figure is a population average. Some people lose substantially more. Some lose less. The COR-BMOD data suggests that what you do alongside the medication matters significantly. Contrave isn't a substitute for behavioral change. It's an amplifier.

Contrave Dosage: The 4-Week Titration Schedule

One of the most important things to understand about Contrave is the dose escalation schedule. You don't start at full dose. The titration exists to minimize side effects, particularly nausea, which is the most common reason people stop the medication early.

The standard titration schedule:

Each tablet contains 90 mg bupropion + 8 mg naltrexone. Maintenance dose is 2 tablets twice daily, for a total of 360 mg bupropion and 32 mg naltrexone per day.

Contrave should be taken with food to reduce GI symptoms. Do not crush, chew, or cut the extended-release tablets. Swallow them whole.

If you miss a dose, skip it and take your next scheduled dose at the regular time. Do not double up.

Some patients stay at a lower dose if they can't tolerate the full titration. That's a decision to make with your provider based on your side effect profile and response.

Contrave Side Effects: What to Expect

Contrave has a real side effect profile. Knowing what to expect lets you get through the difficult first few weeks instead of stopping prematurely.

Most common side effects (reported in clinical trials):

• Nausea (30-33% of patients in the COR trials)
• Constipation
• Headache
• Vomiting
• Dizziness
• Insomnia
• Dry mouth

Nausea is by far the most common issue, and it's the main reason the titration schedule exists. For most people, nausea is worst in the first 2-4 weeks and improves significantly once the body adjusts. Taking the medication with food helps. Some providers recommend starting at an even lower dose in patients with a history of GI sensitivity.

Insomnia is worth flagging because bupropion is an activating drug. It can disrupt sleep, especially if you take the evening dose close to bedtime. Many patients take the evening dose earlier in the day rather than after dinner.

Serious risks (less common but clinically important):

The boxed warning for suicidal thoughts and behaviors is not something to gloss over. This risk comes from the bupropion component. The FDA requires this warning on all bupropion-containing products. The absolute risk is low, but it's real, and it's especially important for patients with a history of depression, bipolar disorder, or anxiety.

Seizure risk is another serious concern. Bupropion lowers the seizure threshold. The observed seizure rate in Contrave clinical trials was 0.06% (about 6 in 10,000 patients). That's low, but it's why a seizure history is an absolute contraindication (Sherman et al., 2016).

Contrave can also raise blood pressure, particularly during the first few weeks of treatment. Patients with uncontrolled hypertension should not take Contrave. Your provider should check blood pressure at baseline and monitor it during treatment.

There are 8,422 adverse event reports for Contrave in the FDA FAERS database. That's expected for a medication that's been on the market since 2014 and has been prescribed to millions of patients. The most frequently reported events in FAERS align with the known side effect profile above.

Who Should Not Take Contrave

Contrave is contraindicated in certain patients. These are not suggestions. They're hard stops based on safety data.

Absolute contraindications:

• Seizure disorder or history of seizures
• Uncontrolled hypertension
• Currently taking other bupropion-containing products (Wellbutrin, Zyban, Aplenzin); this would result in bupropion overdose
• Chronic opioid use or dependence; naltrexone will precipitate immediate opioid withdrawal
• Eating disorders (bulimia nervosa or anorexia nervosa); bupropion substantially increases seizure risk in this population
• Current use of MAOIs or within 14 days of stopping them
• Pregnancy
• Severe liver or kidney impairment

The opioid use contraindication deserves emphasis. Naltrexone blocks opioid receptors. If you're taking prescription opioids for chronic pain, Contrave will block their effect and may trigger withdrawal. This isn't a minor drug interaction. It's a complete incompatibility.

If you're unsure whether any of these apply to you, that conversation needs to happen with your prescribing provider before your first dose.

Contrave vs. Ozempic and GLP-1 Medications

This is the question most people are asking, especially given how much attention semaglutide and tirzepatide have gotten. Here's an honest comparison.

The core difference in mechanism: GLP-1 medications (Ozempic, Wegovy, Mounjaro, Zepbound) slow gastric emptying, suppress appetite through the gut-brain axis, and reduce what patients describe as "food noise." Contrave targets the brain's reward and craving circuitry directly. These are fundamentally different approaches, which is why they work better for different people.

The difference in weight loss outcomes is significant:

If you start at 250 pounds, 9% is about 22 pounds. 15% is 37 pounds. 22% is 55 pounds. The GLP-1 drugs produce substantially more weight loss on average.

So why would anyone choose Contrave over Ozempic or Wegovy?

Several reasons, depending on your situation:

Cost. Branded GLP-1 medications retail at $800-$1,400 per month. Contrave can be obtained for much less (more on that in the cost section). For patients without insurance coverage for weight loss medications, cost is often the deciding factor.

Side effect tolerance. Some patients cannot tolerate the GI effects of GLP-1 drugs: persistent nausea, vomiting, gastroparesis concerns. Contrave's side effect profile is different and may be better tolerated by some people.

Specific mechanism fit. If your primary driver of weight gain is emotional eating, food addiction patterns, or reward-driven cravings rather than general hunger, Contrave's mechanism may be a better match. Narrative reviews of FDA-approved weight loss medications confirmed that Contrave "seems to work most significantly for weight loss by inhibiting the rewarding and reinforcing effects of food consumption" (Duah & Seifer, 2025).

Coverage step therapy. Some insurance plans require patients to try and fail on a first-line medication like Contrave before they'll authorize a GLP-1. Several Reddit users described being on Contrave for 2-3 months specifically to satisfy this requirement before moving to semaglutide.

Can you take Contrave alongside a GLP-1? There's no standard protocol for combining these, and it would be off-label. Some providers are exploring sequential use, transitioning patients from GLP-1 therapy to Contrave for maintenance, based on the mechanism differences. The Cleveland Clinic's STAY-LEAN trial is currently studying exactly this approach: GLP-1 for initial weight loss followed by naltrexone-bupropion for maintenance (NCT06854614).

For a full comparison of GLP-1 medications including semaglutide and tirzepatide, see our comparison of GLP-1 weight loss medications.

The Generic Option: Buying Naltrexone and Bupropion Separately

This is one of the most-discussed topics in the Contrave community. The short answer: yes, you can take the ingredients separately. Many providers prescribe them this way specifically because of cost.

Generic bupropion XL runs about $10-$30/month at most pharmacies. Generic naltrexone is typically $20-$50/month. Combined, you might pay $30-$80/month total instead of hundreds for branded Contrave.

The tradeoff: branded Contrave uses extended-release formulations specifically engineered to release both drugs at coordinated rates. Generic versions may use different release profiles. Whether this matters clinically is debated. The pharmacokinetics of the combination are well-characterized (Ornellas & Chavez, 2011), but no head-to-head trial has compared the brand to off-label generic combination in weight loss outcomes.

The dosing for generic combination therapy is different from Contrave's tablets. With separate components, your provider would typically prescribe bupropion XL 150-300 mg and naltrexone 25-50 mg, adjusted based on your response and tolerance.

If you're already on bupropion for depression, you might only need to add naltrexone, and that conversation with your provider is straightforward. If you're already on a stable antidepressant dose you don't want to disrupt, this is actually one of the cleanest arguments for the separate approach.

Important: if you switch from Contrave to separate components (or vice versa), don't do it without your provider's guidance. The dosing isn't a direct milligram-for-milligram conversion.

For more information on how naltrexone works in this context, see our overview of naltrexone for weight loss.

How Long Does Contrave Take to Work?

Results with Contrave are slower than what most patients experience with GLP-1 medications. Here's a realistic timeline:

Weeks 1-4 (titration phase): This is mostly about tolerating side effects, especially nausea. Some people feel a mild reduction in cravings during this phase, but don't expect scale movement yet. Your body is adjusting to the medication.

Weeks 4-8: This is where many patients start noticing meaningful changes in their appetite and food urges, particularly around emotional eating triggers. The scale may start moving. If you've had no change whatsoever by week 8, that's worth discussing with your provider.

Weeks 12-16: The COR trials typically showed their primary outcomes at 56 weeks, but early response at 12-16 weeks predicts long-term outcomes. Most treatment guidelines suggest that if a patient hasn't lost at least 5% of body weight after 12-16 weeks on full-dose Contrave, the medication may not be the right fit.

Months 6-12: This is where the full weight loss potential becomes measurable. The COR trials ran for 56 weeks, which is roughly a year. The 5-9% average is from patients completing this full duration.

The trajectory is slower than GLP-1 drugs, which often produce noticeable weight loss in the first 4-6 weeks. Contrave requires patience.

Contrave and Alcohol: An Important Interaction

Contrave and alcohol don't mix well, and the reason is more complex than the usual "don't drink on medication" warning.

Naltrexone blocks opioid receptors, which are part of the same pathway that produces the pleasurable buzz from alcohol. Some patients report that alcohol feels less rewarding on naltrexone. This is actually the basis for low-dose naltrexone (LDN) therapy for alcohol use disorder. But it also means the interaction is unpredictable.

Bupropion lowers the seizure threshold. Alcohol also lowers the seizure threshold. Combining them raises seizure risk above either alone.

The FDA prescribing information recommends minimizing or avoiding alcohol consumption while taking Contrave. Some providers are more strict about this than others. The key risk: if you drink heavily and stop abruptly while on Contrave, bupropion's seizure risk during withdrawal becomes a real concern.

Contrave Cost, Insurance Coverage, and Access

This is where the conversation gets practical, and it's important to be honest about what you're looking at financially.

Branded Contrave list price: The retail price of branded Contrave without insurance is approximately $600-$700/month at the full maintenance dose. That's not sustainable for most people.

With GoodRx or pharmacy coupons: Contrave can often be obtained for $99-$200/month using manufacturer coupons or GoodRx discounts. The manufacturer has historically offered a savings card program for commercially insured patients.

Insurance coverage: Most insurance plans do NOT cover weight loss medications as a standalone benefit. Medicare Part D explicitly excludes obesity medications. Commercial insurance coverage varies; some plans cover Contrave with prior authorization (PA), usually requiring documentation of a qualifying BMI and failed attempts at diet/exercise. Getting a PA approved often takes several attempts.

Step therapy requirement: Some insurers require patients to try and fail on Contrave before they'll authorize a GLP-1 medication. This is frustrating but real, and it's one reason providers prescribe Contrave even when they might prefer a GLP-1 as the first choice.

Generic combination (the cost-effective route): As discussed above, the generic components (bupropion + naltrexone separately) can bring costs to $30-$80/month. This is by far the most common workaround patients use when they can't afford branded Contrave and their insurance doesn't cover it.

Telehealth access: You can obtain a Contrave prescription through telehealth in most states. HEXIS providers offer physician-guided weight management consultations, including evaluation for Contrave or the generic combination protocol based on your specific medical history, current medications, and weight loss goals. Schedule a consultation to get a full evaluation, including blood pressure check, medication history review, and contraindication screening, before starting.

If you're weighing Contrave against other weight management options, including our approach to GLP-1 therapy for appropriate candidates, see our guide to weight loss clinic options.

What to Expect if Contrave Doesn't Work

Not everyone responds to Contrave. That's not a failure. It's information about your biology.

The most reliable predictor of non-response is minimal weight loss (less than 5%) after 12-16 weeks at full dose. If that's where you are, it's time to have an honest conversation with your provider about alternatives.

Options from there:

• Transition to a GLP-1 medication (semaglutide or tirzepatide), which uses a completely different mechanism and response profile
• Add adjunctive therapy (metformin for insulin resistance, for example)
• Evaluate whether there's an underlying metabolic or hormonal issue (thyroid, insulin resistance, cortisol) driving weight gain

Contrave isn't the best medication for everyone. It's particularly well-matched for people whose primary challenge is emotional eating, reward-driven food seeking, and craving-driven overeating. If your challenge is more about metabolic rate, insulin resistance, or general appetite volume, the mechanism may not match the problem.

If you've been stuck at a weight loss plateau despite doing everything right, see our overview of common reasons for weight loss plateaus and how to break through them.

Getting Started with Contrave

Contrave is a legitimate FDA-approved tool for weight management with a real evidence base behind it. It works best in people for whom food cravings, emotional eating, and reward-driven hunger are the primary challenges, not those who need general appetite suppression.

The biggest factors in your success: getting through the titration phase without stopping early due to nausea, taking it consistently at full dose, and pairing it with real behavioral changes around food and activity. The COR-BMOD data is clear: Contrave plus intensive lifestyle intervention outperforms lifestyle intervention alone by a meaningful margin.

If you're evaluating whether Contrave is the right fit for your situation, or whether the generic combination, a GLP-1, or a different approach makes more sense, that's exactly the conversation a HEXIS provider can have with you. Your protocol starts with labs and a full medical history review, not guesswork. Schedule a consultation to get a physician-guided evaluation of your weight loss medication options.