Contrave is an FDA-approved prescription medication that combines naltrexone and bupropion to support weight loss. The drug acts on two separate brain systems at once. It reduces appetite and cravings in adults with obesity or overweight who have not responded fully to diet and exercise alone.
Clinical trials show Contrave users lose 2 to 4 times more weight than those relying on diet and exercise alone. The medication targets the brain’s appetite center and dopamine reward system simultaneously. Side effects are common during the titration phase but manageable for most patients. Dosing starts low and increases gradually to improve tolerability.
Between 36% and 57% of Contrave users achieve at least 5% body weight loss in clinical trials. The 12-week checkpoint determines whether treatment continues. This guide covers how Contrave works, who qualifies, what real results look like, and how to get the most from the medication.
What Is Contrave?
Contrave is an FDA-approved prescription medication for chronic weight management in adults with obesity or overweight, taken as a daily extended-release oral tablet. Unlike GLP-1 medications given as weekly injections, Contrave is swallowed every day. It is indicated for use alongside a reduced-calorie diet and a structured physical activity program. Approval is based on BMI and the presence of weight-related health conditions.
What ingredients does Contrave contain?
Contrave contains two active ingredients: naltrexone HCl, an opioid antagonist, and bupropion HCl, a dopamine and norepinephrine reuptake inhibitor. Naltrexone blocks the brain center where opiate-like reward signals bind. Bupropion keeps dopamine and norepinephrine levels slightly elevated in the central nervous system. Together, the two drugs target the hypothalamus and the dopamine reward system to suppress appetite and reduce cravings simultaneously.
Contrave’s active ingredients:
- Naltrexone HCl (opioid antagonist) — blocks food craving reward signals
- Bupropion HCl (dopamine/norepinephrine modulator) — reduces food reward pleasure
- Combined target: hypothalamus (appetite) + dopamine reward system (cravings)
Who is Contrave prescribed for?
Contrave is prescribed for adults who have not achieved sufficient weight loss through diet and exercise alone and who meet specific BMI or comorbidity criteria. Eligible patients have a BMI of 30 or greater (obesity classification). Adults with a BMI of 27 or greater (overweight) also qualify when at least one weight-related condition is present, such as hypertension, high cholesterol, or type 2 diabetes. The medication is not approved for anyone under 18 years of age.
How Does Contrave Work for Weight Loss?
Contrave works by acting on two distinct brain systems at once: the hypothalamus, which regulates appetite, and the dopamine reward system, which drives cravings for high-calorie foods. Here’s why that matters. Most weight-loss approaches only address calorie restriction. Contrave disrupts the brain’s motivation to seek food rewards in the first place. The combined effect of naltrexone and bupropion reduces hunger signals and decreases the pleasure associated with eating high-fat, high-sugar, or high-salt foods.
How does naltrexone reduce cravings?
Naltrexone blocks the brain receptors where opiate-like reward signals bind, disrupting the craving loop that pushes people toward high-calorie food choices. Think of it this way: every time a craving fires, the brain sends a signal through this receptor pathway. Naltrexone interrupts that signal directly. Nerve messages tied to food urges in two separate brain areas are both dampened by naltrexone’s presence. The result is a measurable reduction in the compulsive drive to overeat.
How does bupropion support appetite control?
Bupropion keeps dopamine and norepinephrine levels slightly elevated in the central nervous system, which reduces the reward response the brain assigns to eating. Here’s the part most people miss: food rewards the brain through dopamine release. Bupropion blunts that release. When the reward value of food drops, the motivation to eat large portions or snack compulsively drops with it. Over time, reduced calorie intake from this mechanism drives the weight loss observed in clinical trials.
How Effective Is Contrave?
Contrave has been evaluated in three multicenter, randomized, double-blind, placebo-controlled clinical trials over 56 weeks, involving 4,536 participants who also followed a reduced-calorie diet and exercise program. The numbers are clear. People taking Contrave lost 2 to 4 times more weight than those using diet and exercise alone. Between 36% and 57% of Contrave users achieved at least 5% body weight loss, compared to 17% to 43% with placebo. That gap is consistent across all three trials.
Clinical trial weight loss results at 56 weeks:
| Study | Contrave avg. loss | Placebo avg. loss | Contrave 5%+ responders |
|---|---|---|---|
| COR-I | 5.4% (12 lbs / 5.4 kg) | 1.3% (3 lbs / 1.4 kg) | 42% |
| COR-BMOD | 8.1% (18 lbs / 8.2 kg) | 4.9% (11 lbs / 5.0 kg) | 57% |
| COR-Diabetes | 3.7% (8.5 lbs / 3.9 kg) | 1.7% (4 lbs / 1.8 kg) | 36% |
How much weight can you lose with Contrave?
Contrave users lost an average of 3.7% to 8.1% of their starting body weight across three clinical trials, equivalent to 8.5 to 18 pounds (3.9 to 8.2 kilograms) on average. That’s not all. Waist circumference also shrank. On average, Contrave users lost 2 to 2.4 inches (5 to 6 centimeters) from their waist vs about 1 inch (2.5 centimeters) with placebo. In the best-performing trial, 35% of Contrave users lost at least 10% of their starting body weight. Ready to start losing weight faster with a plan built around these clinical principles? Our coaches at Eat Proteins can help you make the most of every percentage lost.
How fast does Contrave start working?
Contrave typically begins reducing calorie intake shortly after the titration phase starts, with the first formal evaluation checkpoint set at 12 weeks after treatment begins. Here’s what that means in practice: doctors assess weight loss at the 12-week mark. If the patient has not lost enough weight, the prescriber may recommend stopping. Early results within the first month are possible. Contrave reduces appetite from the start, and fewer calories consumed means measurable change can show up before the 12-week checkpoint.
How Is Contrave Taken?
Contrave is taken orally twice daily as an extended-release tablet that must not be split, crushed, or chewed before swallowing. The dose starts low and ramps up over four weeks. Week one begins at one tablet in the morning. Each subsequent week adds one tablet until the full maintenance dose of two tablets twice daily is reached at week four. Taking doses with high-fat meals is a mistake to avoid.
Contrave 4-week titration schedule:
- Week 1: one tablet in the morning only
- Week 2: one tablet in the morning, one tablet in the evening
- Week 3: two tablets in the morning, one tablet in the evening
- Week 4 onward: two tablets in the morning, two tablets in the evening (full maintenance dose)
What is the standard dosage for Contrave?
The maximum daily dose of Contrave is 32 mg naltrexone HCl and 360 mg bupropion HCl, delivered as two tablets twice daily after completing the four-week titration schedule. Patients with impaired kidney or liver function may need dosage adjustments per prescribing guidelines. Once the maintenance dose is established, patients continue at that level as a long-term treatment regimen. No dose increases beyond the maximum are recommended.
Are there foods you should avoid while taking Contrave?
High-fat meals significantly increase Contrave absorption, raise blood drug concentration levels, and elevate the risk of adverse side effects. This is important: the interaction is not minor. Examples of foods to avoid around dose times include fried items, full-fat dairy, fatty meats, and oils. Patients should also reduce overall intake of sugar, salt, and saturated and trans fats during treatment. Alcohol is discouraged as well due to its interaction with bupropion and raised seizure risk.
Foods to avoid while taking Contrave:
- Fried foods and fast food items high in fat
- Full-fat dairy products (cheese, cream, butter)
- Fatty cuts of meat or processed meats
- Cooking oils used in large quantities
- Alcoholic beverages (seizure risk with bupropion)
What Are the Side Effects of Contrave?
Contrave produces side effects most frequently during the four-week dose titration phase, with many symptoms easing once the maintenance dose is established. So, does that mean it gets better? For most people, yes. Nausea is the most commonly reported side effect in early treatment weeks. Most participants in clinical trials tolerated Contrave well enough to continue. Side effects range from mild gastrointestinal discomfort to rare but serious neurological and psychiatric events.
What are the common mild side effects?
Mild side effects of Contrave include nausea, constipation, vomiting, diarrhea, headache, dizziness, insomnia, and dry mouth, all documented in clinical trial data. Nausea is the top complaint and typically decreases as the body adjusts to the medication. One side effect that surprises many patients: Contrave can trigger a false-positive urine drug screen for amphetamines. Patients must disclose Contrave use before any drug test to avoid misinterpretation of results.
Common mild side effects of Contrave:
- Nausea (most frequent, especially in weeks 1 to 4)
- Constipation and diarrhea
- Headache and dizziness
- Insomnia and dry mouth
- False-positive urine screen for amphetamines
What are the serious side effects to know?
Contrave carries an FDA boxed warning for increased risk of suicidal thoughts and behaviors because it contains bupropion, an antidepressant classified drug. That’s the highest-priority warning the FDA assigns. The medication also lowers the seizure threshold, making it dangerous for patients with a history of seizure disorders. Liver damage (hepatotoxicity) is a rare but documented serious risk. Patients with pre-existing liver conditions must discuss this with their doctor before any prescription is written.
Is Contrave Right for You?
Contrave is most suitable for adults who struggle with food cravings or emotional eating and have not achieved sufficient results from diet and exercise programs alone. Here’s the thing: not every weight-loss medication is built for the same patient. Patients who prefer swallowing a pill over weekly self-injections may find Contrave a practical fit. Insurance limitations that block access to GLP-1 medications also make Contrave a common alternative. Clinical studies required both dietary changes and physical activity as part of the treatment protocol.
Who should not take Contrave?
Contrave is contraindicated for patients currently using opioid pain medications or opioid addiction treatments, because naltrexone blocks opioid receptors and can trigger acute withdrawal. Patients with a history of seizures, bulimia, or anorexia face elevated seizure risk and should not take the drug. Additional contraindications include pregnancy, uncontrolled high blood pressure, and concurrent use of other bupropion-containing products. All prior medical history and current medications must be disclosed to a prescriber before starting Contrave.
Who should NOT take Contrave:
- Patients currently using opioid medications or addiction treatments
- Patients with a history of seizures, bulimia, or anorexia
- Pregnant women
- Patients with uncontrolled high blood pressure
- Patients already taking other bupropion-containing products
What Results Can You Expect from Contrave?
Contrave delivers clinically meaningful weight loss for patients who respond to the medication and maintain consistent dietary and exercise commitments throughout treatment. In plain English: 5% to 10% body weight reduction is the target range where real health benefits kick in. Medical weight-loss experts recognize that loss at this level significantly reduces the risk of type 2 diabetes and other obesity-related conditions. Contrave is approved for long-term weight maintenance, not just initial loss. Patients who do not respond at 12 weeks may be advised to stop.
Can Contrave work after just one month?
Yes. Contrave can produce early results within one month, as the drug typically starts reducing calorie intake shortly after the titration phase completes. The good news? The drug begins acting on appetite and cravings before the full maintenance dose is even reached. The 12-week checkpoint is the primary benchmark. Doctors use weight loss data at 12 weeks to determine whether Contrave is delivering sufficient benefit to continue treatment. Clinical trial data confirms measurable weight reduction vs placebo within this window.
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