Stopping bupropion is generally easier than stopping most other antidepressants, but it can still cause withdrawal symptoms and carries a real risk of your original symptoms returning. Bupropion has a half-life of about 21 hours, meaning most of the drug clears your system within four to five days. What happens during and after that window depends on how you stop, how long you’ve been taking it, and why you were prescribed it in the first place.
Withdrawal Symptoms Are Possible but Usually Mild
Bupropion has a lower risk of withdrawal symptoms compared to SSRIs like sertraline or escitalopram, which are known for causing a sometimes intense “discontinuation syndrome.” That said, withdrawal from bupropion does happen. Reported symptoms include anxiety, irritability, sleep disturbances, headaches, muscle aches, fatigue, dizziness, and drowsiness. Some people describe a general brain fog or feeling scattered in the days after their last dose.
These symptoms tend to be mild for most people, but they can be uncomfortable. One documented case involved a patient who developed body aches, drowsiness, dizziness, anxiety, and agitation just two days after stopping the medication. Your experience will vary based on your dose, how long you’ve been on bupropion, and your individual brain chemistry.
The Typical Timeline
If withdrawal symptoms show up at all, they follow a fairly predictable pattern:
Days 1 to 3: Most people feel fine during this window. The drug is still leaving your system gradually. Some people notice low energy or mild brain fog, but nothing dramatic.
Days 4 to 7: This is when symptoms typically peak. You might feel more tired or scattered than usual, develop flu-like symptoms such as headaches or muscle aches, or notice mood shifts, sleep problems, or cravings (especially if you were using bupropion for smoking cessation).
Week 2: Most withdrawal symptoms fade. Your nervous system begins adjusting to functioning without the medication.
Week 3 and beyond: Lingering symptoms are rare. If you’re still feeling off after three weeks, what you’re experiencing is more likely a return of the condition bupropion was treating rather than withdrawal itself.
For most people, the entire withdrawal process starts within a few days and resolves in under a week.
The Bigger Risk: Your Depression Coming Back
The most significant consequence of stopping bupropion isn’t withdrawal. It’s relapse. In a 52-week clinical trial, 56% of patients who discontinued their antidepressant experienced a return of depression, compared to 39% of those who stayed on their medication. That’s a meaningful difference, and it held true even among people who felt well enough to consider stopping.
Depression relapse doesn’t always look like a sudden crash. It can creep back over weeks or months as gradually worsening mood, loss of motivation, disrupted sleep, or difficulty concentrating. Because the change is slow, it’s easy to miss until you’re well into a depressive episode. If you’re stopping bupropion, it helps to have people around you who know what to watch for.
The risk of mood changes is highest during the first few months after stopping. The FDA label for bupropion specifically notes that patients should be monitored for clinical worsening, unusual behavior changes, and suicidal thoughts during dose changes, including decreases and discontinuation.
How to Stop Safely: Tapering Down
The FDA-approved prescribing information for bupropion includes a specific tapering instruction: if you’re taking 300 mg per day, reduce to 150 mg once daily before discontinuing completely. This applies to the extended-release formulation and is explicitly recommended for patients being treated for seasonal affective disorder, though the same principle applies more broadly.
Tapering gives your brain time to adjust. Bupropion works primarily by affecting dopamine and norepinephrine activity, and abruptly removing that influence forces your nervous system to recalibrate all at once. A gradual reduction spreads that adjustment over a longer period, which tends to reduce both withdrawal symptoms and the shock of sudden neurochemical change.
There’s no universal tapering schedule that works for everyone. Your prescriber may adjust the timeline based on your dose, how long you’ve been on the medication, and whether you’re switching to something else. The key point is simple: don’t stop cold turkey without a plan.
Seizure Risk: Context Matters
You may have heard that bupropion carries a seizure risk, and that’s true, but the concern is primarily about taking too much of the drug rather than stopping it. At standard doses of the sustained-release formulation (100 to 300 mg per day), the seizure incidence is about 0.1%. At higher doses, that risk climbs significantly.
Stopping bupropion abruptly is not specifically listed as a seizure trigger. However, certain circumstances raise the overall seizure threshold: a history of seizures, eating disorders, electrolyte imbalances, head trauma, or simultaneously discontinuing alcohol or sedatives. If any of these apply to you, a careful taper becomes even more important.
If You Were Taking It for Smoking Cessation
Bupropion is prescribed under the brand name Zyban for smoking cessation, and stopping it in that context comes with an additional consideration. The FDA label warns that patients stopping bupropion after using it for smoking cessation should be monitored for agitation, depressed mood, and changes in behavior or thinking. These neuropsychiatric effects can emerge during discontinuation even in people with no prior history of mental health conditions.
If you notice significant mood changes after stopping, that’s worth reporting to your prescriber rather than toughing it out.
Switching to Another Medication
If you’re stopping bupropion to switch to a different antidepressant, the transition matters. One important safety rule: if you’re switching to or from a type of antidepressant called an MAOI, at least 14 days must pass between stopping one and starting the other. This isn’t optional. The combination can cause dangerous interactions.
For switches to other common antidepressants like SSRIs or SNRIs, the gap is usually shorter or involves an overlap period. Your prescriber will manage the timing based on what you’re moving to.
What You Might Actually Feel
Putting the clinical data aside, here’s what the experience of stopping bupropion looks like for most people. The first few days feel normal. Around day four or five, you might notice you’re more tired than usual, a bit foggy, or slightly more irritable. Some people get headaches or feel achy, almost like the early stages of a cold. These feelings typically pass within a week.
The harder part comes later. Over the following weeks and months, you’ll be watching to see whether your original symptoms return. If bupropion was keeping depression, anxiety, or seasonal mood changes at bay, those conditions haven’t gone away just because you feel better. The medication may have been the reason you felt better. Staying aware of that distinction is the most important thing you can do after stopping.