Mirtazapine vs Bupropion: side-by-side comparison
Mirtazapine (Atypical antidepressant (NaSSA)) and Bupropion (Norepinephrine-dopamine reuptake inhibitor (NDRI) antidepressant) belong to different therapeutic classes and are rarely substitutes for each other. The comparison is useful when a single patient is weighing both options for adjacent or overlapping needs.
| Property | Mirtazapine | Bupropion |
|---|---|---|
| Therapeutic class | Atypical antidepressant (NaSSA) | Norepinephrine-dopamine reuptake inhibitor (NDRI) antidepressant |
| CAS | 85650-52-8 | 34911-55-2 |
| ATC | N06AX11 | N06AX12 |
| Molecular weight | 265.36 g/mol | 239.74 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Mirtazapine and Bupropion share the common regulatory framework for prescription active ingredients, bioequivalence standards for generics, and pharmacist oversight. Beyond that, points in common are limited.
Key differences
Mirtazapine acts by a different mechanism than Bupropion, with indications that barely overlap. Comparing the two is useful when a clinician has mentioned both in the same context or the patient wants to understand why one was prescribed instead of the other.
Mechanisms compared
Mirtazapine: Mirtazapine antagonises presynaptic α2-adrenergic autoreceptors and heteroreceptors, increasing noradrenaline and serotonin release. Bupropion: Bupropion inhibits the reuptake of norepinephrine and dopamine, with much weaker effect on serotonin reuptake.
Indications compared
Mirtazapine: Mirtazapine is approved for major depressive disorder. Bupropion: Bupropion is approved for major depressive disorder, prevention of seasonal affective disorder recurrence, and smoking cessation.
Safety profile
Mirtazapine: Common adverse effects include sedation (highest at low doses 7.5–15mg, paradoxically less at higher doses), increased appetite, weight gain, dry mouth and dizziness. Bupropion: Common adverse effects include dry mouth, insomnia, headache, agitation, nausea and weight loss.
Frequently asked questions
Is Mirtazapine better than Bupropion? ▾
Mirtazapine and Bupropion are not "better or worse" — they treat different things. The sensible question is which fits your specific need.
Can Mirtazapine and Bupropion be combined? ▾
Whether they can be combined depends on the indications and the interaction profile of each. If both are in a single prescription, the prescriber has weighed it; in self-medication they should never be combined.
Do they have the same side-effect profile? ▾
No — they belong to different classes and have distinct side-effect profiles. Each has its own prescribing information.
Products with Mirtazapine
Products with Bupropion
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.