Auvelity vs Wellbutrin: What the Combination Adds to Bupropion

If you’ve heard that Auvelity is basically Wellbutrin with a cough suppressant added, that description is technically accurate and still misses what makes the combination different.

Your liver normally clears dextromethorphan quickly, using an enzyme called CYP2D6. Bupropion, the active ingredient in Wellbutrin, blocks that enzyme. The Auvelity prescribing information shows how much that matters: with bupropion, dextromethorphan exposure builds to about 32 times its first-dose level at steady state, compared with about 1.4 times without it. Dextromethorphan blocks NMDA receptors, a type of glutamate receptor, so the pairing uses one drug to hold the other in your system with real pharmacological precision.

Bupropion itself is a well-established antidepressant. The Wellbutrin XL prescribing information lists an initial U.S. approval in 1985 and approval for major depression and for preventing seasonal depression, backed by controlled trials of bupropion that include a maintenance trial lasting up to 44 weeks. It works on norepinephrine and dopamine rather than serotonin. The results are real, and the evidence behind bupropion is well established.

But bupropion alone doesn’t act on glutamate signaling, and at Siggy we think a newer option deserves the same scrutiny as an older one before it earns a place in your plan. Auvelity is that newer option: one tablet pairing 45 mg of dextromethorphan with 105 mg of bupropion, built to add a glutamate-based mechanism to the one bupropion already has. What that pairing adds, and how quickly, is a question the trials can answer, so this guide follows the evidence.

What This Page Covers

• What Is the Difference Between Auvelity and Wellbutrin?
• What Does Dextromethorphan Add?
• Does Auvelity Work Faster Than Wellbutrin?
• How Strong Is the Head-to-Head Evidence?
• How Do the Side Effects Compare?
• Auvelity vs Wellbutrin at a Glance
• Who Might Start With Which One?

What Is the Difference Between Auvelity and Wellbutrin?

Both medications contain bupropion. Wellbutrin XL is bupropion alone, and its label starts at 150 mg each morning, with an increase to the usual target of 300 mg once daily after 4 days.

For depression, Auvelity is a single tablet with 45 mg of dextromethorphan and 105 mg of bupropion. You take one each morning for 3 days, then one twice a day, at least 8 hours apart, starting on day 4. At the full dose, that’s 210 mg of bupropion a day. Our guide to Auvelity dosage explains why that twice-daily dose is also the maximum.

Their approved uses differ as well. Wellbutrin XL is approved for major depression and for preventing seasonal depressive episodes. Auvelity’s label lists major depression in adults and agitation associated with Alzheimer’s dementia.

The biggest difference is what each one targets. According to the Auvelity label, bupropion is a relatively weak blocker of norepinephrine and dopamine reuptake and doesn’t block serotonin reuptake. Dextromethorphan adds two different targets: it blocks NMDA receptors and activates sigma-1 receptors. The label also notes that exactly how either ingredient treats depression is still unclear.

What Does Dextromethorphan Add?

On its own, dextromethorphan, the ingredient in many cough medicines, is broken down quickly by CYP2D6. Bupropion is a potent blocker of that enzyme. In a small CYP2D6 study, 6 of 13 people who took bupropion SR 150 mg twice daily for 17 days processed a test dose of dextromethorphan like people who are genetically slow metabolizers.

That’s the engine behind Auvelity. With bupropion on board, dextromethorphan’s half-life roughly triples to about 22 hours, and both drugs reach steady levels within about 8 days, according to its label.

The mechanism is also why researchers expected a faster effect. Stahl’s 2019 pharmacology review describes ketamine and dextromethorphan as acting at the same receptors and notes that standard antidepressants often take several weeks to help. The same review reports that no dissociative or psychotomimetic events were seen in the head-to-head ASCEND trial.

This is also why you shouldn’t build your own version. Auvelity is a specific tablet, with the dextromethorphan in an immediate-release layer and the bupropion in an extended-release layer. Its label asks prescribers to screen for other dextromethorphan and bupropion products before starting, because the risks of seizures and neuropsychiatric reactions rise with dose.

Does Auvelity Work Faster Than Wellbutrin?

Most antidepressants need time. NIMH’s medication overview says they usually take 4 to 8 weeks to work, and that sleep, appetite, energy, and concentration often improve before mood lifts.

Auvelity’s trials show earlier movement. In the phase 3 GEMINI trial of 327 adults, Auvelity improved depression scores more than placebo at week 1 and at every visit after. By week 6, 39.5% on Auvelity were in remission compared with 17.3% on placebo.

Against bupropion alone, the gap opened by week 2. In the ASCEND head-to-head trial, depression scores and remission rates were significantly better with Auvelity than with bupropion at week 2 and at every point after. At week 6, 46.5% on Auvelity were in remission compared with 16.2% on bupropion.

Trial averages describe groups, and your own timing may differ. The first days also include the step up to twice-daily dosing on day 4.

How Strong Is the Head-to-Head Evidence?

The direct comparison comes mainly from ASCEND, and it has real limits:

• It was small. Of 97 people randomized, 80 were included in the efficacy analysis after an independent rater confirmed their diagnosis.
• It was short, lasting 6 weeks.
• It used a modest bupropion dose. The comparison group took 105 mg of sustained-release bupropion twice a day, or 210 mg daily, below the 300 mg target on the Wellbutrin XL label.
• Not every result was clear-cut. Response rates at week 6 were 60.5% with Auvelity and 40.5% with bupropion, a gap that wasn’t statistically significant.
• It was sponsored by Auvelity’s manufacturer, as was GEMINI.

Longer-term data are encouraging but uncontrolled. A 2023 review of long-term data describes two open-label studies in which improvement held through 12 and 15 months, with remission rates approaching 70%. In open-label studies everyone knows they’re taking the drug, so those numbers can’t separate its effect from expectation or natural recovery.

The fair summary is that Auvelity beat placebo quickly in a larger trial and beat lower-dose bupropion in a small one. How it compares with bupropion at the usual 300 mg target is still an open question.

How Do the Side Effects Compare?

Because both contain bupropion, they share its main warnings. Seizure risk rises with dose, blood pressure can go up and should be checked before and during treatment, and both carry a boxed warning about suicidal thoughts in young people. Both labels rule them out for people with a seizure disorder or a current or prior diagnosis of bulimia or anorexia nervosa.

Where they differ, keeping in mind that these rates come from different trials and can’t be compared directly:

• Dizziness leads for Auvelity. In its placebo-controlled depression trial, 16% had dizziness compared with 6% on placebo, followed by headache (8% vs 4%), diarrhea (7% vs 3%), and sleepiness (7% vs 3%).
• Wellbutrin’s most common effects look different. For sustained-release bupropion at 300 mg a day, the Wellbutrin XL label reports dry mouth in 17% (vs 7% on placebo), nausea in 13% (vs 8%), and insomnia in 11% (vs 6%).
• Sexual side effects need a closer look with Auvelity. The GEMINI authors reported no increase in sexual dysfunction, but the label’s side effect table for that same trial lists sexual dysfunction in 6% on Auvelity compared with 0% on placebo.
• Weight trends differ slightly. Auvelity wasn’t associated with weight gain in its trials, while in bupropion SR depression trials 14% of people at 300 mg a day lost more than 5 pounds, compared with 6% on placebo. Our guide to Wellbutrin and weight loss covers that pattern.
• Interactions differ most. Dextromethorphan makes serotonin syndrome a concern when Auvelity is combined with an SSRI or tricyclic antidepressant, according to its label. The Wellbutrin XL label carries no serotonin syndrome warning, though bupropion can raise levels of some SSRIs through CYP2D6.

If you have a seizure, thoughts of harming yourself, or a sudden change in mood or behavior on either medication, call 911 or call or text 988 right away.

Auvelity vs Wellbutrin at a Glance

This table pulls together the points that usually drive the choice, drawn from both labels and the ASCEND trial described above.

Feature	Auvelity	Wellbutrin (Bupropion)
What’s in it	Dextromethorphan 45 mg plus bupropion 105 mg	Bupropion alone
Usual dosing	1 tablet daily, then twice daily from day 4	XL: 150 mg daily, then 300 mg after 4 days
Approved uses	Depression, Alzheimer’s-related agitation	Depression, seasonal depression prevention
Week 6 remission in ASCEND	46.5%	16.2% at 210 mg a day
Most common side effects	Dizziness, headache, diarrhea, sleepiness	Dry mouth, nausea, insomnia
Extra caution	Serotonin syndrome risk with SSRIs	Raises levels of some SSRIs

Who Might Start With Which One?

Every prescriber weighs these differently, but a few patterns follow from the evidence.

Wellbutrin may make more sense when you’re already taking an SSRI and need an add-on. In the STAR*D augmentation trial, adding bupropion SR to the SSRI citalopram led to remission in 29.7% of people whose depression hadn’t lifted on citalopram alone. It also fits when seasonal depression is part of the pattern, or when dose flexibility matters, since it comes in steps rather than a single fixed dose.

Auvelity may get a closer look when early improvement is a priority, you aren’t taking a serotonergic medication, and a twice-daily schedule is workable. If you’re pregnant or planning to be, its label advises using a different treatment, based on animal studies.

Practical factors count, too. Bupropion was first approved in 1985 and is sold in generic versions, while Auvelity is a brand-name tablet approved in 2022, so cost and insurance coverage can differ widely. For how bupropion stacks up against serotonin-based options, see our side-by-side SSRI comparison and our guide to when doctors choose bupropion over an SSRI.

With a medication chosen partly for speed, the first two weeks matter most, which is when both trials first saw a difference.

The choice between them depends on details that are easy to lose in a short visit: what else you take, whether an SSRI is already part of your plan, your blood pressure, your sleep, and how soon you need relief.

Auvelity adds a second mechanism and earlier results in trials, while Wellbutrin offers more dose flexibility, decades of use, and simpler pairing with an SSRI.

Ready to take control of your mental health? Start your anonymous intake with Siggy and get your plan reviewed by a licensed prescriber.

This article is for education only and isn’t a substitute for personal medical advice. Talk with your own clinician before starting, changing, or stopping any medication.