Contrave vs Semaglutide: Which Weight Loss Medication Is Right for You?

Two Very Different Approaches

Contrave and semaglutide are both FDA-approved for weight management, but they work through completely different mechanisms. Choosing between them is not about which is "better" in some abstract sense — it is about which one matches your biology, your history, and your goals.

Let me break this down the way I would in a patient visit.

How They Work

Semaglutide (Ozempic, Wegovy)

Semaglutide is a GLP-1 receptor agonist. It mimics a hormone your gut naturally produces after eating. The effects:

• Slows gastric emptying (you feel full longer)
• Reduces appetite at the brain level
• Decreases "food noise" — that constant background chatter about what to eat next
• Improves insulin sensitivity
• Has cardiovascular protective effects

It is an injectable medication, given once weekly via a small subcutaneous needle.

Contrave (Naltrexone/Bupropion)

Contrave combines two existing medications:

• Naltrexone — an opioid receptor blocker originally used for alcohol and opioid dependence
• Bupropion — an antidepressant (Wellbutrin) that also affects dopamine and norepinephrine

Together, they reduce cravings and reward-driven eating by targeting the brain's pleasure centers. Contrave is an oral medication taken twice daily.

Weight Loss Results

This is where the numbers tell a clear story.

Semaglutide

• Average weight loss in clinical trials: 15-17% of body weight (semaglutide 2.4mg)
• In the STEP 1 trial, participants lost an average of 33 pounds over 68 weeks
• About 1 in 3 patients achieve 20% or more body weight loss

Contrave

• Average weight loss in clinical trials: 5-8% of body weight
• In the COR-I trial, participants lost an average of 12-13 pounds over 56 weeks
• About 1 in 4 patients achieve 10% or more body weight loss

The difference is substantial. Semaglutide produces roughly 2-3 times more weight loss than Contrave in clinical trials.

Side Effect Profiles

Semaglutide Side Effects

• Nausea (most common, usually improves with time)
• Vomiting and diarrhea
• Constipation
• Injection site reactions
• Rare: pancreatitis, gallbladder disease, thyroid concerns

Contrave Side Effects

• Nausea (also common, usually improves)
• Constipation
• Headache
• Dizziness
• Insomnia
• Dry mouth
• Elevated blood pressure (from bupropion)
• Rare: seizures (bupropion component)

Critical difference: Contrave carries a black box warning about suicidal thoughts and behaviors due to the bupropion component. It is also contraindicated in patients with seizure disorders, uncontrolled hypertension, or eating disorders involving purging.

Semaglutide has no psychiatric black box warning but does carry concerns about thyroid C-cell tumors (demonstrated in rodents, unclear clinical significance in humans).

Cost Comparison

Without Insurance

• Semaglutide (Wegovy): $1,000-1,400/month at brand pricing. Compounded versions are significantly less.
• Contrave: $200-400/month at brand pricing. Generic naltrexone/bupropion available for $30-80/month.

Insurance Coverage

Both have coverage challenges. Semaglutide has broader coverage if you have a diabetes diagnosis (prescribed as Ozempic). Contrave coverage varies wildly by plan.

Who Should Consider Semaglutide

• Patients with BMI 30+ or BMI 27+ with obesity-related conditions
• Those who want maximum weight loss results
• Patients with type 2 diabetes or prediabetes (dual benefit)
• Those with cardiovascular risk factors (proven CV benefit)
• Patients who are comfortable with weekly injections
• Those who struggle primarily with satiety and "food noise"

Who Should Consider Contrave

• Patients who cannot afford semaglutide and do not have coverage
• Those who absolutely refuse injections
• Patients whose eating is heavily driven by reward/emotional patterns rather than physical hunger
• Those who also have depression (bupropion may provide dual benefit)
• Patients who also want help with alcohol cravings (naltrexone component)
• Those with a history of thyroid cancer or pancreatitis (contraindications to GLP-1)
• Patients who need a more modest medication approach

Who Should NOT Take Each

Avoid Semaglutide If You Have

• Personal or family history of medullary thyroid carcinoma
• Multiple endocrine neoplasia syndrome type 2
• History of pancreatitis
• History of severe GI disease

Avoid Contrave If You Have

• Seizure disorder or history of seizures
• Uncontrolled hypertension
• Bulimia or anorexia nervosa
• Current opioid use (naltrexone will precipitate withdrawal)
• MAO inhibitor use within 14 days

Can You Switch Between Them?

Yes. Patients who fail Contrave can transition to semaglutide, and vice versa. There is no dangerous interaction between stopping one and starting the other, though you should discuss timing with your provider.

Some providers even combine bupropion (without naltrexone) with semaglutide for patients who have significant emotional eating alongside appetite issues. This is off-label but pharmacologically reasonable.

My Take

I will be direct: for most patients whose primary goal is maximum weight loss and who can access it, semaglutide is the stronger medication. The clinical data is overwhelming.

But medicine is not one-size-fits-all. Contrave has a legitimate role for specific patient profiles — particularly those with reward-driven eating, concurrent depression, alcohol concerns, or access barriers to GLP-1 medications.

The best medication is the one that fits your body, your life, and your wallet. At Coral, we evaluate all of these factors before recommending a weight loss approach. [Start your visit](/start) and let us figure out what makes sense for you.