If you’ve ever heard the phrase “treatment-resistant depression,” you might picture someone who has tried everything – multiple medications, therapy, lifestyle changes, yet still feels stuck in a dark fog.
Here’s my take: I don’t actually believe in “treatment-resistant” depression as a fixed thing. What I believe in is misunderstood depression. And very often, what’s being called treatment-resistant depression (TRD) is actually something else entirely: undiagnosed ADHD.
Why I’m Skeptical of “Treatment-Resistant Depression”
In psychiatry, TRD is usually defined as depression that doesn’t improve after at least two adequate trials of antidepressants. But here’s the problem – “adequate” isn’t consistently defined. Was the dosage right? Was the medication trial long enough? Was psychotherapy included? And what about co-occurring conditions?
Even the research community admits that TRD is more of a moving target than a concrete diagnosis. Which means that labeling someone as “treatment-resistant” may actually be a way of saying, We’re missing something here.
ADHD Hiding in Plain Sight
That “something” might be ADHD.
Here’s what we know:
- High overlap. Studies show that about one-third of people diagnosed with treatment-resistant depression actually meet criteria for ADHD.
- Symptom confusion. ADHD often looks like depression. Low motivation, fatigue, emotional overwhelm, procrastination, shame spirals – these are hallmarks of both.
- Wrong system, wrong meds. SSRIs (the most common antidepressants) target serotonin. ADHD, however, primarily involves dopamine and norepinephrine dysregulation. You can throw serotonin at an ADHD brain all day long, and it won’t fix what’s actually deficient.
I’ve seen this firsthand in my practice: clients who cycled through medication after medication, convinced they were “treatment-resistant,” only to discover that their underlying issue wasn’t depression at all – it was untreated ADHD. Once we addressed the ADHD, the fog lifted.
Why ADHD Gets Missed
ADHD in adults, especially in women, often hides in plain sight. We expect ADHD to look like the little boy bouncing off classroom walls. What we don’t expect is the exhausted professional woman who can’t sustain focus, feels chronically behind, and wonders why she’s never happy no matter how hard she tries.
Add in the fact that ADHD brings emotional dysregulation, fast-rising anger, rejection sensitivity, anxiety that feels like it comes out of nowhere, and suddenly “depression” seems like the obvious label.
But it’s not the full picture.
A Story From My Chair
I once worked with a client who had been on six different antidepressants over a decade. Each one brought a flicker of hope, followed by crushing disappointment. She described herself as “broken.”
When I did a thorough assessment, what stood out wasn’t just her sadness, it was her lifelong pattern of distractibility, unfinished projects, emotional storms, and a brain that simply couldn’t stay in gear.
It wasn’t treatment-resistant depression. It was untreated ADHD.
When she began evidence-based ADHD treatment (stimulant medication plus skills work), her “depression” finally lifted, not because we cured it, but because we treated the real condition.
Why This Matters
Mislabeling ADHD as depression has consequences. People spend years feeling defective. They cycle through medications that don’t work. They lose hope.
But when ADHD is correctly identified:
- Treatments that actually target dopamine and norepinephrine begin to work.
- Motivation, focus, and follow-through improve.
- Emotional storms settle.
- And yes, what looked like “treatment-resistant depression” often melts away.
The Takeaway
Before you or someone you love accepts a label of “treatment-resistant depression,” ask this question: What if it’s not resistance, what if it’s misdiagnosis?
If you’ve tried multiple antidepressants with little relief… if you feel more tired than sad… if you’ve always struggled with focus, follow-through, or emotional regulation, consider being screened for ADHD.
Because sometimes, the most stubborn depression isn’t depression at all. It’s ADHD waiting to be recognized.
You are not broken. You are not resistant. You may simply need a different lens – and the right treatment to match it.