New research shows that antidepressant use drops substantially after ADHD diagnosis — raising thoughtful questions about what was actually going on all along.
If you were treated for anxiety or depression for years before anyone mentioned ADHD — you are not alone, and you are not crazy. A growing body of research is confirming what many of our clients have described in their own words: the antidepressants helped a little, but something was always still missing.
We break down three important studies and what they mean for you — whether you are already diagnosed, wondering if you should be, or trying to understand what your child’s diagnosis might mean for your own brain.
🔬 The research
Antidepressant use falls after ADHD treatment begins
A landmark 2025 Finnish study followed over 66,000 people with ADHD and found something striking: antidepressant use was common before ADHD diagnosis — and dropped substantially once ADHD treatment began. The researchers found that women were significantly more likely than men to have been taking antidepressants prior to their diagnosis.
Women with ADHD were disproportionately more likely to have been using antidepressants before their diagnosis — a pattern researchers suspect reflects years of ADHD symptoms being misread as anxiety or depression.
Why does this happen? ADHD looks different in women. Instead of the hyperactive, disruptive behavior that draws clinical attention in boys, girls and women with ADHD often present with emotional dysregulation, chronic overwhelm, difficulty concentrating, and a persistent sense that they are not living up to their potential. Sound familiar? It also sounds a lot like depression.
♀️ The gender gap in diagnosis
Girls were prescribed antidepressants at nearly three times the rate of boys
📊 By the numbers:
- 14% of girls with ADHD were prescribed antidepressants before ADHD treatment
- 5% of boys with ADHD were prescribed antidepressants before ADHD treatment
- That’s nearly 3× the rate — before anyone looked for ADHD
A systematic review on ADHD in adult women confirmed that girls are far more often referred for emotional concerns — anxiety, mood, social difficulties — rather than the behavioral symptoms that prompt evaluation in boys. This means the diagnostic clock starts later, and in the meantime, the go-to treatment is often an antidepressant.
For many of our clients, this is not a distant statistic. It is their life story.
💡 When depression doesn’t respond to treatment
One in three treatment-resistant depression cases may involve undetected ADHD
Perhaps the most striking finding comes from research on treatment-resistant depression — cases where antidepressants simply do not work well enough. Among that group, 34% had previously undetected ADHD. A history of SSRI failure was one of the key factors linked to that hidden ADHD.
What “treatment-resistant depression” can look like: 🔍
- Tried multiple antidepressants with limited or short-lived relief
- Mood improves somewhat, but focus, motivation, and follow-through remain impaired
- Chronic sense of underachievement despite genuine effort
- Fatigue that doesn’t resolve with better sleep or lifestyle changes
- Emotional sensitivity that feels “bigger than” ordinary sadness
This is not to say antidepressants are wrong or useless — many people with ADHD also have depression, and both deserve treatment. But if you or someone you love has been on antidepressants for years without feeling truly better, an ADHD evaluation is worth having.
👨👩👧 A note for parents reading this
If your child was recently diagnosed with ADHD, you may be noticing some of these patterns in yourself — the chronic overwhelm, the years on antidepressants that helped but never quite solved it, the feeling of being perennially behind. ADHD is highly heritable. Your child’s diagnosis is sometimes the first clue that a parent’s own history deserves a second look.
This is not a reason for alarm. It is a reason for curiosity — and, potentially, for answers that have been a long time coming.
A diagnosis is not a verdict. It is a trailmarker, saying you’re not alone on this path, and guiding evidence-based treatment options.
📚 References
- Westman, E., Prami, T., Kallio, A., Iso-Mustajärvi, I., Jukka, J., Raittinen, P., Korhonen, M. J., Puustjärvi, A., & Leppämäki, S. (2025). Use of antidepressants decreased after initiation of ADHD treatment in adults — a Finnish nationwide register study describing use of ADHD and non-ADHD medication in people with and without ADHD. Acta Psychiatrica Scandinavica, 152(3), 203–215. https://doi.org/10.1111/acps.70007
- Attoe, D. E., & Climie, E. A. (2023). Miss. Diagnosis: A systematic review of ADHD in adult women. Journal of Attention Disorders, 27(7), 645–657. https://doi.org/10.1177/10870547231161533
Sternat, T., Fotinos, K., Fine, A., Epstein, I., & Katzman, M. A. (2018). Low hedonic tone and attention-deficit hyperactivity disorder: Risk factors for treatment resistance in depressed adults. Neuropsychiatric Disease and Treatment, 14, 2379–2389. https://doi.org/10.2147/NDT.S170645