Contrave Review: Side Effects, Results & Better Alternatives

The 30-Second Verdict

Contrave is a real, FDA-approved weight loss medication. It works — just not as well as newer options. After reviewing the pivotal trial data, FDA labeling, and thousands of patient reports, we rate Contrave 3.2 out of 5 stars. Here's the short version:

Contrave works through an unusual combination of two older drugs — a mild antidepressant (bupropion) and an addiction medication (naltrexone). The science is legitimate, the FDA approval is real, and the weight loss is measurable. But in 2026, it competes against GLP-1 medications that deliver 15–22% weight loss from a single weekly injection. That gap is hard to ignore — and it's the core of this Contrave review.

What Is Contrave?

Contrave is a prescription weight loss pill containing two active ingredients: naltrexone 8 mg and bupropion 90 mg in a single extended-release tablet. The FDA approved Contrave in September 2014 as a chronic weight management medication for adults with obesity or overweight patients with at least one weight-related comorbidity.

The generic name for Contrave is naltrexone-bupropion (or bupropion-naltrexone, depending on the label). It is manufactured by Currax Pharmaceuticals, which acquired the drug from Orexigen Therapeutics in 2018. The full product name on FDA labeling is Contrave ER 8/90 mg tablets — "ER" indicates extended release.

Contrave is not new. Both of its ingredients have been on the market for decades:

• Bupropion was approved in 1985 as the antidepressant Wellbutrin®, and in 1997 as the smoking cessation aid Zyban®.
• Naltrexone was approved in 1984 for opioid addiction (ReVia®) and in 1994 for alcohol use disorder.

Contrave is, in effect, a clever repurposing — two generic medications combined in one extended-release formulation and indicated for weight loss.

How Does Contrave Work for Weight Loss?

Contrave targets two distinct brain systems involved in hunger and reward:

1. Hunger regulation (hypothalamus)

Bupropion stimulates pro-opiomelanocortin (POMC) neurons in the arcuate nucleus of the hypothalamus. These neurons release α-MSH, which reduces appetite. But POMC neurons have a built-in off-switch: they also release β-endorphin, which activates opioid receptors that shut the neurons back down.

2. The reward loop (mesolimbic dopamine)

Naltrexone blocks those opioid receptors. With the feedback loop disabled, POMC neurons fire longer and harder, producing sustained appetite suppression. Naltrexone also reduces food-reward signaling in the mesolimbic pathway — the same circuit involved in alcohol and opioid cravings. This is why patients often report reduced cravings for sweet, salty, or high-fat foods within 4–6 weeks.

This dual mechanism is what differentiates Contrave from appetite suppressants like phentermine (pure stimulant) and from GLP-1 agonists (hormone-based gastric emptying and satiety). But "different" doesn't mean "better" — and the efficacy data bears this out.

Contrave Ingredients: What's in Each Pill?

Every Contrave ER 8/90 mg tablet contains:

• Naltrexone hydrochloride 8 mg — opioid receptor antagonist
• Bupropion hydrochloride 90 mg — aminoketone antidepressant, norepinephrine-dopamine reuptake inhibitor (NDRI)
• Inactive: microcrystalline cellulose, hydroxypropyl cellulose, lactose anhydrous, L-cysteine hydrochloride, magnesium stearate, edetate disodium, polyvinyl alcohol, titanium dioxide, FD&C Blue No. 2 lake, others

At the maintenance dose of 4 tablets per day, you are taking:

• 32 mg naltrexone daily (vs. 50 mg standard for alcohol-use disorder)
• 360 mg bupropion daily (vs. 300–450 mg typical antidepressant dose of Wellbutrin XL)

These doses matter because they put Contrave patients into the therapeutic range of the underlying medications. In other words, at target dose, you are effectively on a low-dose antidepressant. This has implications for drug interactions, mood effects, and side effects — all of which we cover on our side effects page.

Does Contrave Actually Work? The Trial Data

The FDA approved Contrave based on the COR (Contrave Obesity Research) trials — four Phase 3 studies totaling over 4,500 patients. Here's what the data actually showed:

COR-I (1,742 patients, 56 weeks)

• Contrave 32/360: −6.1% body weight vs. placebo −1.3%
• 48% lost ≥5% body weight vs. 16% on placebo

COR-II (1,496 patients, 56 weeks)

• Contrave 32/360: −6.4% body weight vs. placebo −1.2%
• 50.5% lost ≥5% body weight vs. 17.1% on placebo

COR-BMOD (793 patients with intensive lifestyle program)

• Contrave: −9.3% body weight vs. placebo −5.1%
• Translation: intensive behavioral modification + Contrave adds ~4% beyond lifestyle alone

Bottom line: Contrave produces roughly 5–8% average weight loss over one year. For a 200-lb person, that's 10–16 lbs. For someone with a starting BMI of 35 trying to reach a normal BMI, that's not going to get you there.

Contrave Pros and Cons

Here is our side-by-side breakdown based on clinical data, FDA labeling, and patient-reported outcomes:

Who Is Contrave Actually For?

The FDA-approved indication for Contrave is adults with:

• BMI ≥ 30 (obesity), OR
• BMI ≥ 27 with at least one weight-related comorbidity (type 2 diabetes, hypertension, dyslipidemia)

Contrave is intended as an adjunct to a reduced-calorie diet and increased physical activity — not a standalone treatment.

Contrave may be a reasonable choice if:

• You cannot or will not use injectable medications
• You have a history of food cravings (especially sweet/high-fat foods) or emotional eating
• You also have depression and could benefit from bupropion's mood effects
• You are trying to quit smoking (bupropion is the active ingredient in Zyban)
• Cost is a major factor and insurance does not cover GLP-1 medications

Contrave is probably not right if:

• You are looking for significant weight loss (>10%)
• You have a seizure disorder, eating disorder, or uncontrolled hypertension
• You take any opioid medications (including chronic pain meds)
• You are pregnant, planning pregnancy, or breastfeeding
• You have a history of bipolar disorder or suicidal ideation

Is Contrave a Controlled Substance?

No. Contrave is not a controlled substance. Neither of its active ingredients is scheduled by the DEA:

• Bupropion has no abuse potential at therapeutic doses and is not scheduled
• Naltrexone is the opposite of a drug of abuse — it blocks opioid receptors

This differentiates Contrave from older weight loss medications like phentermine (Schedule IV), Qsymia (contains phentermine, Schedule IV), and benzphetamine (Schedule III). You don't need a special DEA registration to prescribe Contrave, and pharmacies do not have special handling requirements.

However, "not controlled" does not mean "low risk." Contrave still has an FDA black box warning and multiple clinically significant contraindications. Not a controlled substance ≠ safer than controlled alternatives. See our complete side effects analysis.

Contrave vs GLP-1: The Comparison That Matters Most

Most 2026 weight loss conversations revolve around GLP-1 receptor agonists — semaglutide (Wegovy, Ozempic off-label), tirzepatide (Zepbound, Mounjaro off-label), and liraglutide (Saxenda). If you are evaluating Contrave, this is the comparison to understand.

The comparison is not subtle. On every clinically meaningful dimension except "I really don't want injections," GLP-1 medications outperform Contrave. Full breakdown on our comparison page.

Frequently Asked Questions