Most people taking Contrave lose about 5% to 6% of their body weight over the course of a year. For someone starting at 250 pounds, that translates to roughly 12 to 15 pounds. That number climbs significantly when the medication is paired with structured diet and exercise changes, and some people lose considerably more than the average.
Average Weight Loss in Clinical Trials
The largest clinical trial of Contrave, known as COR-I, found that participants taking the standard dose lost an average of 6.1% of their body weight over 56 weeks. The placebo group, which received the same general diet advice but no active medication, lost just 1.3%. That means roughly 4.8 percentage points of weight loss can be attributed to the drug itself.
To put that in real numbers: a person weighing 220 pounds could expect to lose around 13 pounds on Contrave over a year, compared to about 3 pounds with diet effort alone. These are averages, though, and individual results vary widely. Some participants lost much more, while others saw little change.
Results With Lifestyle Changes
Contrave performs noticeably better when combined with a serious behavioral program. In the COR-BMOD trial, participants who took Contrave alongside intensive lifestyle counseling (regular group sessions, calorie tracking, exercise goals) lost 9.3% of their body weight at 56 weeks. Those who completed the full year without dropping out lost 11.5%. For a 230-pound person, that’s roughly 21 to 26 pounds.
Even the placebo group in that trial lost 5.1%, because the lifestyle program alone was effective. But adding Contrave nearly doubled the result. This is one of the clearest findings across all the trials: Contrave works best as an addition to real changes in eating and activity, not as a standalone fix.
Results for People With Type 2 Diabetes
Weight loss tends to be slightly harder for people with type 2 diabetes, but Contrave still showed meaningful results in this group. In studies of diabetic patients already taking other medications, those who added Contrave lost between 5.4% and 5.9% of their body weight at one year, compared to 0.2% to 1.5% for placebo.
Early responders did especially well. Patients with diabetes who lost at least 5% of their starting weight by 16 weeks and continued treatment for a full year ended up losing 8.8% overall. That pattern of early response predicting long-term success holds true across most Contrave studies.
When Weight Loss Typically Happens
Most of the weight loss on Contrave occurs within the first 12 weeks. You won’t see dramatic results in the first week or two, partly because the dose is gradually increased during the first month. The standard schedule starts with one tablet per day during week one, adds a second tablet in week two, a third in week three, and reaches the full dose of four tablets per day (two in the morning, two in the evening) by week four.
This slow ramp-up helps minimize side effects, but it also means the medication doesn’t reach its full strength until about a month in. From there, most people see the bulk of their weight loss between weeks 4 and 12. After that, the rate of loss typically slows and levels off, with gradual additional losses through the rest of the first year.
The 12-Week Checkpoint
Contrave doesn’t work equally well for everyone, and the FDA label includes a clear rule for identifying non-responders: if you haven’t lost at least 5% of your starting body weight after 12 weeks on the full maintenance dose, you should stop taking it. At that point, continued use is unlikely to produce meaningful results.
Your prescriber will typically check your progress around this time. If the medication is working, you’ll know by then. If the scale hasn’t moved much despite consistent use and reasonable diet effort, Contrave probably isn’t the right tool for you, and continuing it just means taking on side effects without benefit.
How Contrave Works
Contrave combines two older medications that each affect the brain differently. One component reduces cravings by acting on the brain’s reward circuitry, the same pathways involved in addiction and pleasure. The other stimulates a system in the hypothalamus (the brain’s appetite control center) that regulates hunger and energy balance.
Together, they address two sides of overeating: the biological drive to eat and the reward-based pull toward food. Neither ingredient produces dramatic weight loss on its own. In early studies, one component alone produced only 2.7% weight loss and the other just 1.2%. The combination effect, where each drug amplifies the other, is what makes Contrave more effective than either ingredient individually.
Side Effects That Affect Adherence
The most common reason people stop taking Contrave before seeing full results is nausea. Up to 32.5% of trial participants experienced it, making it by far the most frequent side effect. Constipation affected up to 19.2%, headache up to 17.6%, vomiting up to 10.7%, and dizziness up to 10.4%.
Nausea is usually worst during the first few weeks while the dose is being increased, and it tends to improve over time. The gradual dose escalation during the first month exists specifically to reduce this problem. For many people, the nausea is manageable and fades. For others, it’s severe enough to make them quit the medication before reaching the point where weight loss becomes apparent. If you can get through the first month, your chances of tolerating the drug long-term improve considerably.
Realistic Expectations
Contrave is a moderate weight loss medication. It won’t produce the 15% to 20% body weight reductions seen with newer injectable medications. What it reliably produces, for people who respond to it, is a 5% to 10% loss that can be enough to improve blood pressure, blood sugar, joint pain, and other weight-related health markers.
The people who lose the most on Contrave share a few things in common: they respond early (visible progress by 12 weeks), they pair the medication with real dietary and exercise changes, and they stick with it for a full year rather than stopping after a few months. In the best-case scenario, with strong lifestyle modifications and a full year of treatment, losses of 10% or more are realistic. Without those supporting habits, expect something closer to 5% to 6%.