Wellbutrin (bupropion) is generally safe for most adults when taken as prescribed. It has been FDA-approved since the 1980s and has a well-established safety profile for treating depression and helping with smoking cessation. That said, it carries specific risks that make it unsuitable for certain people, and its side effects differ noticeably from other antidepressants. Here’s what you should know before starting or continuing it.
How Wellbutrin Works Differently
Wellbutrin isn’t an SSRI. Instead of targeting serotonin like most common antidepressants, it primarily boosts dopamine and norepinephrine, two brain chemicals involved in motivation, energy, and focus. It also blocks nicotine receptors, which is why a version of it is prescribed for smoking cessation. This different mechanism explains why its side effect profile looks so different from medications like sertraline or fluoxetine.
Common Side Effects
In clinical trials comparing Wellbutrin to a placebo, the most frequently reported side effects were dry mouth (28% vs. 18% on placebo), constipation (26% vs. 17%), headache (26% vs. 22%), excessive sweating (22% vs. 15%), dizziness (22% vs. 16%), nausea or vomiting (23% vs. 19%), and tremor (21% vs. 8%). Agitation was also common, reported by about 32% of people on Wellbutrin compared to 22% on placebo. Insomnia affected roughly 19% of users.
About 10% of participants in early clinical trials stopped taking Wellbutrin because of side effects. The most common reasons for quitting were agitation and mood changes (3%), nausea and vomiting (2%), headaches and sleep problems (1.7%), and skin rashes (1.4%). For the majority of people, side effects are manageable and often improve after the first few weeks.
Sexual Side Effects and Weight
One reason many people are drawn to Wellbutrin is that it largely avoids two of the most frustrating side effects of SSRIs: sexual dysfunction and weight gain. In trials, rates of sexual side effects on Wellbutrin were nearly identical to placebo. Weight gain was actually less common on Wellbutrin than on placebo (14% vs. 23%).
Wellbutrin is more likely to cause weight loss than gain. Studies of the extended-release version showed that 23% of people taking 150 to 300 mg per day lost five pounds or more, while only 11% gained that much. With the sustained-release version at 300 mg, 14% lost more than five pounds, and just 3% gained that amount. If you’re already underweight or struggling with appetite, this is worth discussing with your prescriber.
The Seizure Risk
The most serious safety concern with Wellbutrin is seizures. The risk is dose-dependent: at standard doses up to 300 mg per day, the seizure rate is about 0.1%, or 1 in 1,000 people. At 400 mg per day, that rises to 0.4%. Above 450 mg per day, the risk climbs significantly. This is why there’s a strict maximum daily dose, and why the medication is typically taken in divided doses or in extended-release form to avoid sharp spikes in blood levels.
Several factors can lower your seizure threshold further, making Wellbutrin unsafe or requiring extra caution. These include a history of seizures, eating disorders (particularly bulimia or anorexia), heavy alcohol use, and abrupt withdrawal from alcohol, benzodiazepines, or barbiturates. If any of these apply to you, Wellbutrin is either contraindicated or needs very careful medical supervision.
Who Should Not Take Wellbutrin
Wellbutrin is specifically contraindicated for people with:
- Seizure disorders: Any history of epilepsy or recurrent seizures rules out this medication.
- Eating disorders: People with a current or past diagnosis of bulimia or anorexia nervosa have a higher seizure risk on bupropion.
- Abrupt alcohol or sedative withdrawal: Stopping alcohol, benzodiazepines, or barbiturates suddenly while on Wellbutrin increases seizure risk substantially.
- Severe liver disease: The medication requires dose reduction for moderate liver problems and is not recommended for severe liver dysfunction.
- Certain eye conditions: People with untreated narrow-angle glaucoma should avoid it.
People with bipolar disorder also need caution, as Wellbutrin (like other antidepressants) can trigger manic or hypomanic episodes. Kidney problems may require a lower dose or less frequent dosing.
Wellbutrin and Alcohol
Mixing Wellbutrin with alcohol is not considered safe. Alcohol lowers the seizure threshold, compounding the medication’s own seizure risk. It also reduces Wellbutrin’s effectiveness at treating depression, potentially triggering a return of symptoms. Common side effects like nausea, dizziness, blurred vision, and headaches can all worsen with alcohol use.
There’s an additional risk that catches some people off guard: if you’ve been drinking regularly while on Wellbutrin and then suddenly stop drinking, the withdrawal itself can trigger seizures. This creates a difficult situation where both continued drinking and abrupt cessation carry risks, making it important to talk honestly with your prescriber about your alcohol use before starting the medication.
The FDA’s Boxed Warning
Like all antidepressants, Wellbutrin carries an FDA boxed warning about increased risk of suicidal thoughts and behavior in children, adolescents, and young adults under 25. This warning is based on short-term studies across the antidepressant class, not Wellbutrin specifically. In adults over 24, studies did not show this increased risk. In adults 65 and older, antidepressants were actually associated with a reduced risk compared to placebo.
Regardless of age, anyone starting Wellbutrin should be monitored for unusual changes in mood or behavior, especially in the first few weeks. This includes new or worsening anxiety, agitation, panic attacks, irritability, or any thoughts of self-harm.
Safety During Pregnancy
Data on Wellbutrin in pregnancy is limited but somewhat reassuring. A study tracking 136 women exposed to bupropion during their first trimester found no major malformations in the 105 live births, with normal average birth weight (about 7.6 pounds) and full-term delivery. However, the study did find a statistically significant increase in spontaneous miscarriage compared to unexposed women. The overall evidence suggests bupropion does not increase the rate of major birth defects above baseline, but the miscarriage finding means the decision to continue or start Wellbutrin during pregnancy involves weighing the risks of untreated depression against potential pregnancy complications.
Drug Interactions to Watch
Wellbutrin is broken down in the liver through multiple pathways, including one enzyme system responsible for producing its main active byproduct. This means other medications that affect the same liver enzymes can change how much Wellbutrin or its active form is circulating in your body. MAO inhibitors are the most dangerous interaction and should never be combined with Wellbutrin. You should also be cautious with other medications that lower the seizure threshold, including certain antipsychotics, other antidepressants, stimulants, and some antibiotics. Always give your prescriber a complete list of everything you take, including over-the-counter medications and supplements.
For most adults without the specific risk factors listed above, Wellbutrin has a favorable safety profile compared to many other antidepressants. Its lower rates of sexual side effects and weight gain make it a well-tolerated option for many people. The key to taking it safely is honest communication with your prescriber about your full medical history, your alcohol and substance use, and any changes you notice after starting the medication.