Wellbutrin Side Effects: What to Expect and When to Worry

Wellbutrin can cause dry mouth, nausea, insomnia and anxiety. A pounding heart or worsening mood needs its own assessment.

I want new, worsening or disruptive symptoms reported promptly. You don't have to wait several weeks or become unable to function before contacting your prescriber.

If you have a seizure while taking Wellbutrin XL, stop taking it, call 911 and do not restart it. Notify your prescriber. The FDA label does not allow a later restart after a seizure.

For a new rash, itching, hives or other possible allergic symptoms, stop Wellbutrin XL and contact a healthcare professional right away. Trouble breathing, swelling of the lips or tongue, blistering or painful skin sores, or chest pain requires emergency care. Call 911 for severe symptoms.

Call 911 for chest pain, severe shortness of breath, fainting, overdose or immediate danger. For suicidal thoughts or a mental health crisis, call or text 988; use emergency care if you can't stay safe.

The quick answer

• Commonly reported effects include trouble sleeping, dry mouth, nausea, constipation, dizziness and anxiety. Common does not mean you should ignore them.
• There is no reliable recovery calendar for an individual person. Ask your prescriber what to watch and when to check back.
• Blood pressure, seizure risk, mood changes and the full medication list need review. A symptom's timing alone doesn't establish its cause.
• Routine dose, timing, formulation and stopping decisions belong with your prescriber. The urgent stop instructions for seizure, allergy and certain neuropsychiatric reactions are explained here.

I use the FDA-approved Wellbutrin XL prescribing information and Medication Guide on DailyMed for these precautions. This guide focuses on XL; another bupropion product may have different instructions.

Not every article needs an appointment. Use this page for research. Turn it into a visit when the pattern is affecting a real medication, diagnosis, or daily-function decision.

Turn this into a visit when

• You are changing, stopping, restarting, or adding a psychiatric medication.
• Side effects are shaping the decision more than the original symptom is.
• The medication partly helps, but the diagnosis, sleep, labs, or timing still do not fit.

Bring this pattern

current medication listdose and timingside effectssleep patternprior trials

Available for appropriate patients in California and Arizona.

What to report first

What you notice	What to do
Seizure while taking Wellbutrin XL	Stop XL, call 911, notify the prescriber and do not restart
Possible allergy, including a new rash or hives	Stop XL and contact a healthcare professional right away; severe symptoms need emergency care
Chest pain, severe breathing trouble, fainting or suspected overdose	Get emergency care; call 911
Suicidal thoughts, hallucinations, marked mood elevation or severe confusion	Get urgent assessment; call or text 988 for crisis support, and use 911 or an emergency department if unsafe
New or worsening insomnia, anxiety, palpitations or effects disrupting daily life	Contact the prescriber promptly for an individualized plan
Dry mouth, nausea or other bothersome symptoms	Report them, including when they began and how they affect eating, sleep or daily function

The FDA label supports the medication precautions. The emergency and crisis routes are safety guidance, not a diagnosis from a symptom list. I don't use this table to tell someone that a pounding heart is harmless.

What Wellbutrin actually does

Wellbutrin XL is bupropion, an antidepressant approved for major depressive disorder and prevention of seasonal major depressive episodes in people with seasonal affective disorder.

Its antidepressant mechanism isn't fully understood. Norepinephrine and dopamine pathways are thought to be involved; bupropion does not inhibit serotonin reuptake the way an SSRI does. That description cannot predict your energy, concentration or side effects.

I check the treatment goal before interpreting a new symptom. An energizing feeling is not proof the medicine is treating the right condition. Nor does the name Wellbutrin guarantee weight loss or preserved sexual function.

Zyban also contains bupropion and has smoking-cessation labeling. That indication does not automatically apply to Wellbutrin XL. Tell your prescriber about any other medicine containing bupropion so duplicate exposure is avoided.

Before you keep searching

If this answer changes what you might do next, pick the next clinical question now.

Care path Turn this into a medication review Bring your current list. Dose, timing, side effects, interactions, and the labs nobody ordered — reviewed in one visit. Dose or formulation question Compare 150mg, 300mg, XL, SR, timing, seizure risk, and what to check before increasing. SSRI comparison question Use this when the real issue is anxiety pattern, libido, weight, sleep, or antidepressant fit.

Or read how medication management works

Common effects still need a plan

The XL Medication Guide lists trouble sleeping, anxiety, dry mouth, nausea, constipation and dizziness among common effects. The full label also reports headache, tremor, sweating, palpitations and tinnitus in its trial data.

I want to know whether you can sleep, eat and function, and whether the pattern is improving or worsening. A symptom can be listed in a trial and still be unacceptable for you.

There is a reason I don't give one percentage table for every Wellbutrin product. The XL label includes sustained-release depression trials and extended-release seasonal-depression trials. Those populations, formulations and exposures are different. Combining their rates into a single range can make an individual risk look more certain than it is.

How long do side effects last?

Some symptoms may ease as treatment continues. The label does not supply a universal day-by-day timetable for insomnia, headache, anxiety or nausea, and I won't promise one.

Depression benefit may take several weeks. That is not a reason to delay reporting side effects. A follow-up plan should cover both benefit and tolerability, with a clear route for contacting the prescriber sooner when the pattern changes.

Sleep and anxiety

Difficulty sleeping and feeling keyed up deserve a review of the actual prescription, recent changes, baseline sleep, caffeine and other substances. I also ask whether you feel exhausted from lost sleep or unusually energetic despite barely sleeping. Those are different clinical questions.

Increasing irritability, impulsive behavior, racing thoughts or a reduced need for sleep can signal mania or hypomania. Get prompt clinical assessment. Severe agitation or inability to stay safe needs emergency care.

Don't add a sleep medicine, supplement or another psychiatric drug to suppress these symptoms on your own. There isn't a standard melatonin, sedative or formulation-switch recipe that is safe for every reader.

Heart symptoms and blood pressure

Bupropion can raise blood pressure. The FDA label calls for checking blood pressure before treatment and periodically during it. Some increases can be severe, and nicotine replacement can add to that concern.

Palpitations deserve assessment in context. I can't establish your heart rhythm from a description, and I don't assume a new pounding heartbeat is simply early activation.

Contact the prescriber promptly about new or worsening palpitations or blood pressure changes. Chest pain, fainting, severe shortness of breath, a severe headache with neurologic symptoms or another medical emergency needs emergency care, not a routine message.

If you already have blood pressure or pulse readings, bring them. Do not delay urgent care to collect more measurements or wait for a number to cross an internet threshold.

Mood changes need direct attention

The boxed warning describes increased suicidal thoughts and behavior in children, adolescents and young adults in short-term antidepressant trials. Depression itself also carries suicide risk.

Monitoring matters at every age, especially during early treatment and dose changes. I take new suicidal thoughts, worsening depression or unusual behavior seriously regardless of whether the medicine, the illness or several factors are involved.

Tell the prescriber right away about new or worsening suicidal thoughts. Call or text 988 for crisis support; immediate danger or inability to stay safe requires 911 or an emergency department.

Before prescribing, the label calls for screening for bipolar disorder and its risk factors. Wellbutrin XL is not approved for bipolar depression. Marked mood elevation, little need for sleep, reckless behavior or unusually rapid speech warrants urgent assessment.

Hallucinations, delusions, paranoia or severe confusion also need urgent medical assessment. The XL label instructs discontinuation if psychosis or related neuropsychiatric reactions occur. Stop XL and seek that assessment; if you're unsafe, call 911. I don't treat those symptoms by suggesting you occasionally skip a dose.

If bupropion is being used during a smoking-cessation attempt, tell the prescriber that context too. Its Medication Guide gives specific stop-and-contact instructions for new changes in thinking, behavior or mood during that use.

Seizure and allergy precautions

Seizure risk is dose-related and depends on other medical conditions and medicines. I don't turn a rate measured with SR or immediate-release bupropion into a personal XL risk estimate.

Wellbutrin XL is contraindicated with a seizure disorder, a current or prior diagnosis of anorexia nervosa or bulimia, or abrupt discontinuation of alcohol, benzodiazepines, barbiturates or anti-seizure medicines. Other risks, including head injury and drugs that lower seizure threshold, belong in the prescribing review.

Tell your prescriber about these factors even if they seem remote or embarrassing. Don't abruptly stop heavy alcohol use or a prescribed sedative on your own; withdrawal can itself cause seizures and requires clinical planning.

If a seizure occurs while taking XL, stop it, get emergency care and do not restart. This is the label's explicit safety instruction, not a suggestion to try again at a smaller dose.

Allergic reactions can include rash, itching, hives, swelling and breathing problems. The Medication Guide also flags fever, swollen glands and painful sores around the mouth or eyes. Stop XL and get medical advice immediately for possible allergic symptoms. Severe breathing trouble, facial or tongue swelling, blistering skin or other severe symptoms requires emergency care.

Eye pain, sudden vision changes, or redness and swelling around the eye needs urgent assessment. Antidepressants can trigger angle-closure glaucoma in susceptible people. I don't call a sudden painful vision change an ordinary adjustment effect.

Sexual function, weight and hair

Does Wellbutrin cause sexual side effects?

I ask directly about libido, orgasm and sexual function. Bupropion is not a promise of zero sexual side effects.

Two randomized depression trials found less treatment-emergent orgasm dysfunction and worsened sexual functioning with bupropion XL than with escitalopram. Those trials involved adults with normal sexual function at baseline; they do not prove that every patient or every SSRI comparison has the same result (Clayton et al., 2006; PMID: 16841623).

The label also includes sexual symptoms in trial or postmarketing reports. Report a change so medication effects, depression, other medicines and medical factors can be considered together. Don't self-switch or add an antidepressant based on a comparison online.

Will I lose or gain weight?

Appetite and weight can change. The label's depression and seasonal-depression trials included people who lost weight and people who gained weight. They do not establish a guaranteed amount of weight loss for you.

I care about whether you're eating enough and whether a change is intended. Significant unintentional weight loss, poor intake or a new weight concern deserves review. Appetite suppression is not automatically a benefit, particularly when eating-disorder history changes whether bupropion is safe.

Can it cause hair loss or ringing in the ears?

Hair loss appears in postmarketing reports. Voluntary reports cannot reliably establish frequency or prove that bupropion caused a particular person's shedding. The label does not promise a start date, mechanism or recovery schedule.

Tinnitus appears in the trial data. If new ringing, hair shedding, sweating or taste changes bother you, tell the prescriber. I check the timing and competing explanations rather than assuming every symptom is either the medicine or nothing.

The whole medication list matters

I want prescriptions, nonprescription medicines, supplements and substance use on the same list. Another medicine's dose can matter even when your Wellbutrin prescription hasn't changed.

Bupropion is mainly metabolized through CYP2B6. Inhibitors and inducers can change bupropion or metabolite exposure. Bupropion also inhibits CYP2D6 and can increase exposure to certain other medicines, including some antidepressants, antipsychotics, metoprolol and some rhythm medicines. A pharmacist or prescriber should check the actual combination.

MAO inhibitors and bupropion have important contraindications and separation requirements. Linezolid and intravenous methylene blue also require specific clinical handling. Don't calculate a switching interval or restart date yourself.

Other drugs can lower seizure threshold. Liver or kidney impairment can affect prescribing. Tell the clinician about pregnancy, plans for pregnancy or breastfeeding; bupropion passes into breast milk, and the benefits and risks need an individual discussion.

The label advises minimizing or avoiding alcohol. If you drink heavily, get medical guidance before suddenly stopping. I need the real pattern of use to plan safely.

Formulation and stopping questions

XL, SR and immediate-release bupropion have different prescribing instructions. I check the exact bottle and pharmacy label before discussing timing, a switch or a dose change.

Follow your own prescription. XL tablets should be swallowed whole, not cut, chewed or crushed. If you miss an XL dose, the Medication Guide says not to take an extra dose to make up for it; take the next dose at the regular time.

Ask your prescriber about bothersome symptoms before making a routine change. Do not alternate formulations, double doses, add another bupropion product or use a home taper schedule.

For planned discontinuation, the XL label includes tapering instructions. Your prescriber should decide how those apply to your prescription and treatment history. I won't promise that stopping is symptom-free or that every new symptom after stopping is simply depression returning.

The seizure, allergic-reaction and psychosis instructions above are urgent exceptions. They should not be replaced by generic advice to keep taking the medicine until a routine appointment.

Testing should answer a question

A medication effect, another medical condition, poor sleep and interactions can overlap. I start with the history, examination when indicated and the timeline. Testing depends on what that review raises.

A thyroid test, blood count or other investigation may be appropriate for a specific concern. No universal ferritin, vitamin, hormone or glucose panel can determine whether Wellbutrin is the right medicine.

I don't use a lab result as proof that a symptom is harmless, or postpone urgent medical or psychiatric care while waiting for testing. Persistent fatigue also deserves review; bupropion does not guarantee more energy.

Bring the pattern to a review

Bring the bottle or an accurate list showing dose and formulation, when treatment began and any recent changes. Write down when symptoms occur, how sleep and eating changed, and what interferes with daily life.

Include other prescriptions, supplements, caffeine, nicotine, alcohol and other substance use. Bring existing pulse or blood pressure readings and relevant lab results if available. Don't delay care to assemble a perfect record.

See how medication management works, or request a medication review. If the diagnosis or possible medical contributors need review, request diagnostic clarity.

I want a review that explains the symptom and gives you a safe next step. A contact request is for routine care; it is not an emergency service.

Safety before the next dose

This article is educational and cannot replace your prescriber's advice. Routine starting, stopping, tapering, combining or changing psychiatric medicines needs that guidance. Pregnancy, breastfeeding, interactions and medical history affect the plan.

If a seizure occurs on Wellbutrin XL, stop it, call 911 and do not restart. For possible allergic symptoms, stop XL and contact a healthcare professional immediately; severe symptoms need emergency care. For psychosis or related neuropsychiatric reactions, the label also instructs discontinuation and urgent assessment.

Call 911 for chest pain, severe shortness of breath, fainting, seizure, severe allergy, suspected overdose or immediate danger. For suicidal thoughts or a mental health crisis, call or text 988. Signs of mania or psychosis need urgent assessment; if you cannot stay safe, go to an emergency department or call 911.

References

• DailyMed / U.S. National Library of Medicine. Wellbutrin XL — FDA-approved prescribing information and Medication Guide. Label revised November 2025; DailyMed updated February 10, 2026. Sections 1–8, 12.1 and 17. Official product label and Medication Guide.
• Clayton AH, Croft HA, Horrigan JP, et al. (2006). Bupropion extended release compared with escitalopram: effects on sexual functioning and antidepressant efficacy in 2 randomized, double-blind, placebo-controlled studies. Journal of Clinical Psychiatry, 67(5), 736–746. DOI: 10.4088/jcp.v67n0507. PMID: 16841623.
• National Institute of Mental Health. Frequently Asked Questions About Suicide. Revised 2023. Crisis support and emergency guidance.