Across 109 trials, mania or hypomania occurred in 12.5 percent on antidepressants and 7.5 percent without
"The overall risk of mania with/without ADs averaged 12.5%/7.5%." The switch was more frequent in bipolar disorder, but the increase was larger in people diagnosed with depression.
Well-supported by good-quality research. how we score evidence
Caveat on this rating: Pools randomized and open trials of very different designs and durations; the 12.5 and 7.5 percent are averages, not a controlled comparison. Hypomania definitions vary. No hospitalization outcome.
How often does an antidepressant push someone into mania? This review pooled everything available.
Significant findings
Tondo, Vazquez and Baldessarini (Acta Psychiatrica Scandinavica, 2010) found "73 reports (109 trials, 114 521 adult patients)", of which 35 could be pooled.
"The overall risk of mania with/without ADs averaged 12.5%/7.5%. The AD-associated mania was more frequent in BPD than MDD patients, but increased more in MDD cases. Tricyclic antidepressants were riskier than serotonin-reuptake inhibitors (SRIs); data for other types of ADs were inconclusive. Mood stabilizers had minor effects probably confounded by their preferential use in mania-prone patients."
Their conclusion: "Use of ADs in adults with BPD or MDD was highly prevalent and moderately increased the risk of mania overall, with little protection by mood stabilizers."
Worth asking
The part that matters for someone starting an antidepressant for depression is the second sentence: the relative increase was larger in people with a depression diagnosis, some of whom have a bipolar illness nobody has seen yet. These are averages across very different trials, and a rating-scale hypomania in a trial is not a hospital admission. On mood stabilizers this review and the Swedish register study in this wave disagree, which is an honest picture of the evidence. The practical step is the same: report a sudden drop in sleep with a surge of energy to your prescriber quickly. Never stop on your own.
Source
Mania associated with antidepressant treatment: comprehensive meta-analytic review — Tondo L, Vazquez G, Baldessarini RJ (2010)
Reputable peer-reviewed journal
Read the source: https://doi.org/10.1111/j.1600-0447.2009.01514.x
DOI: 10.1111/j.1600-0447.2009.01514.x
How this was scored
- Study design
- Meta-analysis of randomised trials
- Funding
- Funding not disclosed
- Published in
- Reputable peer-reviewed journal
- Sample size
- 114,521
- Preregistered
- not recorded
- Conflicts disclosed
- not recorded
- Independent of proponent
- not recorded
- Retracted
- No
Read the full scoring rubric, including what it can't tell you.
Published September 21, 2026.
Questions
How strong is the evidence behind this?
veisund rates this source "strong evidence". Well-supported by good-quality research. It scores 70 out of 100 on our published rubric. One caveat travels with that badge: Pools randomized and open trials of very different designs and durations; the 12.5 and 7.5 percent are averages, not a controlled comparison. Hypomania definitions vary. No hospitalization outcome. The score is calculated from recorded facts about the source — study design, funding, publication venue, sample size, preregistration — not typed in by an editor.
What is the source for this?
Mania associated with antidepressant treatment: comprehensive meta-analytic review — Tondo L, Vazquez G, Baldessarini RJ (2010). Published in: Reputable peer-reviewed journal. DOI: 10.1111/j.1600-0447.2009.01514.x. The full source is linked on this page so you can read it yourself.
Who paid for this research, and does that matter?
Study design: Meta-analysis of randomised trials. Funding: Funding not disclosed. Independence from the proponent is not recorded. Industry sponsorship is one of the most reliably measured biases in medicine, which is why funding carries real weight in the score rather than sitting in a footnote.
Is this medical advice?
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.