Bupropion is an dopamine and noradrenaline re-uptake inhibitor and works as an antidepressant. Meaning it works on dopamine and noradrenaline rather than serotonin, which is what makes it different from almost everything else in its class. Most people are prescribed it for depression, smoking cessation, or seasonal affective disorder, but it gets used off-label for ADHD, low motivation, fatigue-dominant depression, and to rescue sex drive in people whose SSRIs have flattened it. The practical reasons people end up on it: it doesn't kill libido, it doesn't cause weight gain (often the opposite), and it tends to be activating rather than sedating.

If you're choosing between bupropion and an SSRI, the trade-off is roughly this: bupropion preserves sex drive, energy, and weight but is less effective for anxiety and carries a small but real seizure risk at higher doses. SSRIs are better for anxiety and panic but commonly blunt libido and add weight over time. For people whose depression looks like low energy, low motivation, anhedonia, oversleeping, and brain fog, bupropion is often the better fit. For people whose depression is driven by anxiety or rumination, it's usually not.

Deep-dive

Dosage:

• Standard starting dose (XL/extended-release): 150 mg once daily in the morning for 4-7 days, then 300 mg once daily. This is the target dose for most people on it for depression, SAD, or off-label uses
• Maximum dose: 450 mg/day. Above this the seizure risk rises sharply (roughly 10x at 600 mg). Don't exceed 450 mg without specific reason and clinical oversight
• SR (sustained-release): 150 mg once daily for 3 days, then 150 mg twice daily, with the second dose taken before 3pm to avoid insomnia. Max 200 mg twice daily (400 mg/day)
• Smoking cessation: 150 mg once daily for 3 days, then 150 mg twice daily for 7-12 weeks. Start the medication 1-2 weeks before your quit date so it's at full effect when you stop
• SAD prevention: Start 150 mg/day in autumn before symptoms typically appear, increase to 300 mg/day after a week, continue through winter, taper to 150 mg for two weeks in early spring before stopping
• HSDD or SSRI-induced sexual dysfunction: 150 mg/day SR or XL is often more effective than 300 mg for desire specifically, per the dose-response data. Higher doses can paradoxically worsen the desire response
• Older adults: Start at 75-150 mg/day and titrate more slowly. Effects are unchanged but tolerability windows narrow
• Timing: Always take in the morning. Bupropion is activating and late-day dosing reliably wrecks sleep
• Don't crush or chew XL or SR tablets. This converts a slow-release formulation into an immediate-release dump and dramatically increases peak concentration and seizure risk. The empty tablet shell sometimes appears in stool with XL, this is normal
• Onset: Activation, energy, and focus often improve within 1-2 weeks. Mood effects typically take 4-6 weeks at the target dose. Don't judge it before week 4
• Stopping: Bupropion has minimal withdrawal compared to SSRIs and SNRIs because it doesn't act on serotonin. Most people can taper relatively quickly (over 1-2 weeks) without significant discontinuation symptoms

Here's what you can expect:

In the first week or two, the activating effects usually come first: more energy, better focus, less of the leaden fatigue that often comes with depression. Some people feel slightly wired, jittery, or anxious during the initial titration, especially if they're sensitive to stimulants. This usually settles by week 3-4 as the system adjusts.

Mood improvement is slower. Most people don't notice clear mood lift until weeks 4-6 at the target dose, and the trajectory tends to be gradual rather than dramatic. If you're someone whose depression presents as anhedonia, low motivation, and brain fog, bupropion often works well. If your depression is dominated by anxiety, panic, or obsessive rumination, it's less reliable and may not be the right fit.