What Is Wellbutrin (Bupropion) Used For?
Wellbutrin is the brand name for bupropion, an antidepressant approved in the US for depression and seasonal depression. It works differently from SSRIs.
By withClaro Editorial · 2026-11-02 · 4 min read
Clinical section reviewed by Dr. Jason Tan, Consultant Psychiatrist, on October 27, 2026.
More about Wellbutrin
Comparisons
Key takeaways
- Wellbutrin is the brand name for bupropion, approved in the US for depression and to prevent seasonal depression.
- It is not an SSRI: it acts mainly on dopamine and norepinephrine, so its side effects differ, with less sleepiness, weight gain and sexual side effects than SSRIs.
- The usual Wellbutrin XL dose is 150 mg in the morning, which may go up to 300 mg after 4 days for depression or after a week for seasonal depression.
- It can cause seizures at high doses, so the dose stays within the label's limits and rises gradually.
What is Wellbutrin used for? Mainly depression, and preventing seasonal depression. Its generic name is bupropion, and it was first approved in the US in 1985. Unlike most antidepressants it is not an SSRI, so its side effects differ: it is less sedating, a 2024 study of 183,118 people linked it to less weight gain than sertraline, and a 2002 study of 6,297 people found fewer sexual side effects reported than on SSRIs.
What is Wellbutrin used for?
The FDA approves Wellbutrin XL for major depressive disorder and for preventing seasonal depressive episodes in seasonal affective disorder. For seasonal depression it is started in autumn, before symptoms begin, continued through winter, and tapered and stopped in early spring. Prescribers also use it outside the label, for example alongside an SSRI or for some people with anxiety; it has no FDA approval for those, which is common and legal. More in Wellbutrin for anxiety. The same medicine, sold as Zyban, is approved to help people stop smoking. In 2024 bupropion was prescribed about 34.9 million times in the US, by ClinCalc estimates.
Is Wellbutrin an SSRI?
No. The label calls bupropion an aminoketone, chemically unrelated to SSRIs. It weakly blocks the reuptake of norepinephrine and dopamine and does not block the reuptake of serotonin. That is why its side effects differ from SSRIs such as Zoloft and Lexapro. For the other types, see the list of antidepressants.
How does Wellbutrin work?
Medically reviewed by Dr. Jason Tan on October 27, 2026, this section only.
Bupropion is one of the few antidepressants that acts on dopamine as well as norepinephrine. The label says its exact mechanism is unknown, and it can feel activating rather than calming. What the clinical view adds is why the effect on mood still takes weeks:
Most act on serotonin, norepinephrine or both. A few, such as bupropion, also act on dopamine. Some newer treatments work differently, for example esketamine, which acts on glutamate.
The chemical change starts within hours, yet the full effect on mood takes weeks. Current thinking points to early changes in how the brain processes emotion, then slower changes in receptors, in brain circuits that handle emotion, and in how the brain forms new connections.
Most antidepressants do not produce a high. When they work, people often say they feel more like themselves. ## What doses does Wellbutrin come in?
Wellbutrin XL tablets come in 150 mg and 300 mg, taken once a day in the morning. For depression, the label starts at 150 mg and allows 300 mg after 4 days. For seasonal depression, the step to 300 mg comes after a week. People with moderate or severe liver problems are limited to 150 mg every other day. More in Wellbutrin dosage.
Why does Wellbutrin have a seizure warning?
Bupropion can cause seizures, and the risk rises with the dose. The XL label sets 300 mg once a day as the usual top dose and names 450 mg as the limit for seizure risk. In studies of the sustained-release form at up to 300 mg a day, about 1 in 1,000 people had a seizure. The rate for the XL form was never measured on its own, and with the immediate-release form the risk rose almost tenfold between 450 and 600 mg a day. Other medicines and conditions, such as heavy drinking or a past head injury, also make a seizure more likely.
The label says not to use it with a seizure disorder, with bulimia or anorexia now or in the past, or while suddenly stopping alcohol, benzodiazepines, barbiturates or seizure medicines. If a seizure happens, Wellbutrin is stopped and not restarted.
What is the Wellbutrin boxed warning?
Like every US antidepressant, Wellbutrin carries an FDA boxed warning about suicidal thoughts and behavior. The risk is higher in children, teenagers and young adults, but the label asks for close watching at every age, most of all in the first months and after a dose change. If you're having thoughts of harming yourself, contact emergency services or a crisis line straight away. In the US, call or text 988. In the UK, call Samaritans on 116 123. Elsewhere, find a crisis line near you.
What side effects does Wellbutrin cause?
In the depression trials, the most common side effects were dry mouth, nausea, insomnia, dizziness and agitation. In short trials of the sustained-release form at 300 mg, 14% of people lost more than 5 pounds and 3% gained, against 6% and 4% on placebo. In a 2024 study of 183,118 people, compared with sertraline at six months, bupropion meant about 0.22 kg less gain and a 15% lower risk of gaining 5% of body weight or more.
If agitation, anxiety or insomnia keeps building in the first weeks or after a dose change, rather than settling, call your prescriber without waiting for the next appointment.
What should you tell your prescriber before starting Wellbutrin?
Some conditions and medications change whether Wellbutrin is a good fit, so name them at the first appointment. Before you start, tell your prescriber about:
- any seizure, head injury or eating disorder, now or in the past
- how much alcohol you drink, and any plan to stop suddenly
- any MAOI antidepressant in the past 14 days, which rules Wellbutrin out
- other antidepressants and medications, especially ones processed by the liver enzyme CYP2D6
- high blood pressure, liver problems or a history of mania
- pregnancy, plans for pregnancy or breastfeeding
Download on the App Store Sleep, energy and mood don't always change at the same time on Wellbutrin, so it helps to note them separately. The withClaro app lets you log mood, sleep, energy and side effects each day, linked to your dose, and turns it into a report for your prescriber.
Related articles
Sources
- WELLBUTRIN XL (bupropion) prescribing information, US Food and Drug Administration via DailyMed, revised February 2026
- Petimar J, et al. Medication-induced weight change across common antidepressant treatments. Annals of Internal Medicine, 2024
- Clayton et al., 2002, Journal of Clinical Psychiatry: Prevalence of sexual dysfunction among newer antidepressants
- ClinCalc DrugStats: The Top 300 Drugs of 2024
Claro articles are for self-monitoring and educational purposes only. They are not a medical device, therapist, or diagnostic tool, and do not replace care from your prescribing clinician. If you are in crisis, contact your care team, emergency services, the Samaritans (UK: 116 123), or the Crisis Text Line (US: text HOME to 741741).