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Bupropion (Wellbutrin): uses, side effects and safety

Name: Bupropion (Wellbutrin): uses, side effects, safety | The Health Initiative
Published: 2026-10-09

Bupropion (Wellbutrin) is a prescription antidepressant. Per its FDA label, it treats major depression and prevents seasonal (winter) depression; sold as Zyban, the same medicine helps people quit smoking. It is not an SSRI and not a controlled substance. Its main risk is seizures, so it is not right for everyone: the doctor evaluates whether it is appropriate for you.

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What is bupropion?

Bupropion is an antidepressant that works differently from the most common ones. It is not an SSRI like sertraline or fluoxetine: per its label, it weakly blocks the reuptake of two brain chemicals, norepinephrine and dopamine, which is why it is called an NDRI. The label notes its exact mechanism is unknown.

It is sold under several names: Wellbutrin SR and Wellbutrin XL (extended release; XL is taken once a day), Zyban for quitting smoking, and generics. They all contain the same active ingredient, so two bupropion products are never taken together.

It is not a controlled substance. The Wellbutrin XL label states that bupropion is not scheduled by the DEA. It still needs a prescription after a medical evaluation.

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What is bupropion used for?

According to its FDA-approved labels, bupropion is used for three things:

Major depressive disorder: its main use. See depression.
Preventing seasonal affective disorder (winter depression): only Wellbutrin XL is approved for this. It is started in the autumn, before symptoms begin.
Quitting smoking: as Zyban, the same medicine is approved as an aid to smoking cessation. See quit smoking.

Wellbutrin SR, Wellbutrin XL and Zyban

Wellbutrin SR and Wellbutrin XL are for depression; XL also prevents seasonal depression. The Wellbutrin XL label says it is not approved for smoking cessation: that is what Zyban, with the same ingredient, is for.

MedlinePlus also lists off-label uses, such as depression in bipolar disorder and ADHD. A physician decides on those case by case.

Bupropion for quitting smoking (Zyban)

Per the Zyban label, treatment starts before you quit: you set a quit date within the first 2 weeks, once the medicine has reached its level in the blood. Treatment continues for 7 to 12 weeks. It can be used with a nicotine patch, but that combination can raise blood pressure, so it is monitored.

In December 2016, the FDA removed the boxed warning about mood and behavior effects in people quitting smoking, after a large trial found the risk lower than previously suspected. The information remains in the warnings section of the label: if you notice strong changes in mood or behavior, stop and tell your doctor. For options such as the patch, gum or varenicline, see quit smoking.

Wellbutrin side effects

According to the Wellbutrin XL label and MedlinePlus, the most common side effects are:

Dry mouth
Insomnia (trouble sleeping)
Nausea, stomach pain and constipation
Dizziness and headache
Anxiety, agitation or tremor
Heavy sweating, palpitations and ringing in the ears
Less appetite

Serious risks: seizures, blood pressure and mood

Seizures. Per the label, the seizure risk is dose-related: it rises at higher doses. That is why the dose is increased gradually and never above the maximum your doctor sets. Never double a dose if you missed one.

Suicidal thoughts (boxed warning). The FDA requires a boxed warning: antidepressants increase the risk of suicidal thoughts and behavior in children, adolescents and young adults; MedlinePlus describes it in people under 24. The risk is highest in the first months and when the dose changes.

Mood or behavior changes. The label calls for watching for agitation, anxiety, panic, irritability, a very high mood (mania) or unusual behavior. Before starting, the doctor asks about bipolar disorder, because an antidepressant can trigger a manic episode.

Blood pressure. Bupropion can raise blood pressure. The label calls for checking it before starting and during treatment. See high blood pressure.

Angle-closure glaucoma. In people with narrow eye angles it can trigger a glaucoma attack.

Who should not take bupropion?

Per the Wellbutrin XL label, bupropion is not used in people who:

Have a seizure disorder
Have or have had bulimia or anorexia
Are abruptly stopping alcohol, benzodiazepines, barbiturates or antiepileptic medicines
Take an MAO inhibitor for a psychiatric condition, or stopped one less than 14 days ago (and one is not started until 14 days after stopping bupropion); it is also not started with linezolid or intravenous methylene blue
Are allergic to bupropion or other ingredients of the tablet

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Book an evaluation; the doctor decides whether a treatment is right for you.

You see Dr. Diana Nieves Castro, MD, a Puerto Rico–licensed general practice physician, in English or Spanish. Every day, any time (Puerto Rico time). Doctor online 24/7: video doctor visits 24/7. Request a visit online and you choose your time when you book. We send you a secure video link.

Which visit to book. If it is your first time talking about mood, depression or quitting smoking, book a doctor visit: the doctor listens, reviews your medicines, blood pressure and history, and goes over the options with you. See mental health by video. If you already take a medicine and need follow-up, see prescription refills. See pricing.

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If you are thinking about harming yourself

If you have thoughts of harming yourself or ending your life, do not wait for a visit: call or text 988, or call Línea PAS at 1-800-981-0023. Both answer any time and are free and confidential. In an emergency, call 911. See when to go to the ER.

When to go to the ER

If you take bupropion and have any of these signs, call 911 or go to the emergency room:

A seizure
Thoughts of harming yourself or ending your life
Swelling of the face, tongue or throat, hives or trouble breathing (a severe allergic reaction)
Very high blood pressure with a severe headache, chest pain or vision changes
Confusion, hallucinations or a sudden major change in behavior

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We evaluate, diagnose and treat; if needed, we give you a lab order for a lab near you.
We see adults and children of all ages. Patients under 21: a parent with patria potestad (parental authority) or a legal guardian is on camera for the whole visit and shows photo ID.
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If appropriate, the doctor prescribes and we send your prescription to your pharmacy.
You must be physically in Puerto Rico during the visit (visitors, tourists and cruise passengers are welcome).
In an emergency, call 911.

Frequently asked questions

Does bupropion help you quit smoking?

Yes. As Zyban, bupropion is FDA-approved as an aid to quitting smoking. It is started one to two weeks before your quit date and used for 7 to 12 weeks. It can be combined with a nicotine patch, with blood pressure monitoring.

Does bupropion help with anxiety?

It is not approved for anxiety disorders. Its label lists anxiety, agitation and insomnia among its common side effects, especially at the start. If anxiety bothers you most, tell the doctor: there are other treatment options.

Does bupropion cause weight loss?

Some people lose a little weight, but it is not approved for that. In the studies in its label, more people on bupropion than on placebo lost more than 5 pounds. For weight, the FDA approved bupropion only combined with naltrexone: Contrave.

Can you drink alcohol on bupropion?

The label says to drink very little alcohol or avoid it, because it can worsen side effects. If you drink heavily, do not stop suddenly on your own: abruptly stopping alcohol during treatment raises the seizure risk. Talk it over with the doctor.

How long does bupropion take to work?

According to MedlinePlus, it can take 4 weeks or longer to feel the full benefit on mood. Insomnia or dry mouth can show up sooner. Do not stop it suddenly without talking to your doctor, even if you feel better.

What is the usual dose of bupropion?

The doctor decides the dose. For reference, the Wellbutrin XL label starts at 150 mg once a day in the morning and, after 4 days, the dose may go up to the usual 300 mg a day; the maximum is 450 mg a day. For quitting smoking, the Zyban label gives 150 mg a day for 3 days, then 150 mg twice a day, at least 8 hours apart.

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