A treatment-resistant depression diagnosis can feel like both a relief and a gut punch. It's a relief because it names what you've been living with: medication after medication that didn't work. It's a gut punch because "resistant" sounds permanent. Before anyone settles on that label, though, a careful provider should ask a different question: has this depression truly resisted treatment, or has something been getting in the way? Clinicians call the second situation pseudo-resistance, and it's more common than most patients realize.
What "treatment-resistant" means
Most definitions of treatment-resistant depression (TRD) require an inadequate response to at least two different antidepressants, each taken at an adequate dose for an adequate length of time. A 2024 review in American Family Physician estimates that about 31% of people with major depressive disorder meet criteria for TRD (AAFP). We covered the warning signs in 5 Signs Your Antidepressants Aren't Working. This post is about the step that should come before the label: ruling out pseudo-resistance.
Expert reviews consistently recommend checking the diagnosis, the adequacy of past treatment, and medical or psychiatric factors that could be blocking a response (McIntyre et al., World Psychiatry, 2023).
1. Was each medication trial truly adequate?
"I tried Zoloft once" can mean a lot of things. A trial generally needs a therapeutic dose, held long enough (often four to eight weeks at that dose), to judge it fairly. Starting low and stopping after two weeks because of side effects doesn't really count as a failed trial. That doesn't mean you should have pushed through intolerable side effects. It means the history matters.
What to do: Make a list of every antidepressant you've taken, the highest dose, how long you stayed at that dose, and why you stopped.
2. Was the medication taken consistently?
This isn't about blame. Side effects, cost, forgetting, and mixed feelings about medication are all very human. But they affect results. The AAFP review cites an estimated antidepressant nonadherence rate of 46% (AAFP). If doses were frequently missed, the medication may never have had a fair chance.
3. Could it be bipolar depression?
This is one of the most important questions. Bipolar disorder often first shows up as depression, and standard antidepressants alone frequently don't work well for bipolar depression. They can sometimes worsen mood instability. The AAFP review notes that up to 25% of patients presenting with depression or anxiety in primary care are diagnosed with bipolar disorder. Past episodes of unusually high energy, little need for sleep, racing thoughts, or impulsive behavior, even brief ones, are worth mentioning to your provider.
4. Is a medical condition contributing?
Several physical conditions can cause or worsen depressive symptoms, including:
Thyroid disorders, especially hypothyroidism
Sleep disorders like obstructive sleep apnea and chronic insomnia
Chronic pain conditions
Vitamin deficiencies such as low B12 or vitamin D
Hormonal transitions, including perimenopause
Neurological or cardiovascular disease
A basic workup, often including labs and a sleep history, can uncover a treatable contributor.
5. Are other medications or substances interfering?
Alcohol, cannabis, and other substances can blunt antidepressant response and worsen mood on their own. Some prescription drugs can affect mood, and others change how your body processes antidepressants. Smoking, for instance, can speed up the metabolism of certain psychiatric medications.
6. Is something else going on psychiatrically?
Untreated anxiety disorders, PTSD, ADHD, eating disorders, and personality-related patterns can all keep depression going. Treating the depression alone, without addressing a co-occurring condition, often leads to a partial response at best.
7. Are life circumstances keeping the depression in place?
Ongoing trauma, an unsafe relationship, grief, financial crisis, or chronic isolation can make depression very hard to shift with medication alone. That's not "resistance" in the biological sense. It's a sign that the treatment plan needs to include therapy, practical support, or both.
What about genetic testing?
Pharmacogenetic tests that claim to predict which antidepressant will work are widely marketed. The 2024 AAFP review concluded that the evidence for routine pharmacogenetic testing is limited and doesn't recommend it for TRD. It may be useful in specific situations. Ask your provider whether it makes sense for you.
If it really is TRD, here's where Spravato fits
If you've worked through this list and the answer is still "yes, this is treatment-resistant depression," that tells you to change strategy, not to give up. Options include switching medication classes, augmentation strategies, psychotherapy, TMS, ECT, and esketamine (Spravato). We'll walk through the full roadmap in an upcoming post.
Spravato deserves a closer look here because it was studied and approved specifically for this situation. It's an FDA-approved nasal spray for adults with treatment-resistant depression, used on its own or with an oral antidepressant, and it works through the glutamate system rather than serotonin. That's also why the checks above matter: a careful workup tells us whether you're actually a good candidate. Spravato isn't right for everyone. It isn't used in people with certain blood vessel conditions, such as an aneurysm or arteriovenous malformation, or a history of bleeding in the brain, and it temporarily raises blood pressure.
Treatment happens in a certified healthcare setting under the Spravato REMS program. You give yourself the spray while a provider supervises, we monitor you for at least two hours, and you can't drive until the next day after a restful sleep. Results vary, and there are no guarantees. Try our 5-minute self-assessment or read How Does Spravato Work in the Brain?
If your workup points to TRD, book a free 15-minute consultation to see if Spravato is right for you.Frequently asked questions
What is pseudo-resistant depression?
Pseudo-resistance describes depression that looks treatment-resistant but has actually been held back by other factors, such as inadequate dose or duration, missed doses, a missed diagnosis like bipolar disorder, or an untreated medical condition.
How many antidepressants do you have to try before it's considered TRD?
Most definitions require an inadequate response to at least two different antidepressants, each at an adequate dose and duration during the current episode.
Can thyroid problems cause depression that doesn't respond to medication?
Hypothyroidism can cause fatigue, low mood, and slowed thinking that overlap with depression. Checking thyroid function is a standard part of evaluating depression that isn't responding to treatment.
Should I get a second opinion if I've been told I have TRD?
A second opinion is reasonable, especially if your diagnosis hasn't been revisited in years or you've never had a medical workup. A fresh evaluation can catch overlooked factors.
