What Is Treatment-Resistant Depression—And What Can You Do About It?

Key takeaways

• There’s no single agreed-upon definition of treatment-resistant depression (TRD), but it’s commonly defined as depression that hasn’t improved enough after trying at least two antidepressants.
• About 30% of people with major depressive disorder have treatment-resistant depression.
• Treatment-resistant doesn’t mean untreatable. It means that the treatments you’ve tried so far haven’t provided enough relief, and a different approach may be worth exploring.
• Depression may not respond to treatment for many reasons, including differences in brain biology, other mental or physical health conditions, or a treatment plan that isn’t the right fit.
• Treatment options for TRD include different medication strategies, esketamine (Spravato), transcranial magnetic stimulation (TMS), electroconvulsive therapy (ECT), and psychotherapy.
• If depression isn’t improving despite treatment, the next step is a re-evaluation with a mental health specialist to confirm your diagnosis, look for factors that may be affecting treatment, and determine which options make sense to try next.

Treatment-resistant depression can feel like a frustrating label for an even more frustrating experience: taking steps to feel better, but still not finding enough relief. When that happens, it can be easy to wonder if you’re doing something wrong, or even if you’re somehow “too broken” to get better. But a treatment not working well enough isn’t a personal failure—it’s actually a fairly common experience. 

In fact, about 30% of people with major depressive disorder (MDD) meet the most commonly used definition of treatment-resistant depression, according to a review in World Psychiatry. 

Treatment-resistant depression (TRD) is characterized by “a major depressive episode that has not responded to the usual treatments,” says Joshua Bess, MD, medical director of Seattle NTC. Generally, that means depression hasn’t improved enough after trying at least two antidepressants at appropriate doses and for an adequate amount of time.

But “treatment-resistant” doesn’t mean untreatable. Taking another look at your diagnosis and treatment plan can help uncover why treatment hasn’t worked and which options may make sense to try next. Here’s what to know about TRD and where you can go from here.

What is treatment-resistant depression (TRD)?

Treatment-resistant depression (sometimes called refractory depression) describes depression that does not get better with conventional treatment.  Many have settled on a more specific definition, calling it "treatment-resistant depression" (or TRD) if the depression has not responded to two or more antidepressant medications.  Since that definition is common, we'll use that one here.

Why two? “While we know that medication plus psychotherapy is better than either alone, a trial of psychotherapy is less clearly defined than a trial of medication, and the numbers are harder to convey clearly,” Dr. Bess says. “So most of us use the medication trials as a shorthand.”

Research in Psychopharmacology also shows that the likelihood of responding to another medication tends to decrease with each trial.

Still, TRD doesn’t look exactly the same for everyone. According to World Psychiatry, other signs that it may be time to talk with your provider include:

• Your depression symptoms have continued for months or years despite treatment.
• Your symptoms continue to interfere with daily life.
• You’ve tried psychotherapy along with medication but continue to experience symptoms.
• You’ve tried adding another medication to your treatment plan but still haven’t gotten enough relief.

It’s also important to understand what the word “resistant” means here. “Some have suggested calling it ‘difficult to treat depression (DTD)’ given the possibility that saying something is ‘resistant’ could mean someone is ‘resistant,’” Dr. Bess says. In other words, “resistant” describes the depression, not you or your willingness to get better.

Why antidepressants don’t always work

“Depression is a brain disease, and the brain is an incredibly, and beautifully, complex organ,” says Colleen Hanlon, PhD, vice president of medical affairs at BrainsWay. “You can think of the brain as a symphony, wherein different instruments represent different neural circuits. When everything is working well, the music sounds great. But as you can imagine, there are many things that can go wrong which make the music unpleasant.”

That complexity helps explain why antidepressants don’t work for everyone. In particular, these factors may play a role in medication-resistant depression:

• Depression isn’t caused by one simple chemical imbalance: Many antidepressants affect serotonin, a brain chemical involved in mood, says Dr. Hanlon. But research in Signal Transduction and Targeted Therapy suggests depression actually involves a much more complex mix of brain circuits and biological processes.
• Different treatments work for different brains: “The specific functions in the specific parts of the brain that an antidepressant acts on might improve one person’s depression, but their neighbor’s depression might be caused by some other function in some other brain area,” Dr. Bess explains. 
• Dose and side effects can get in the way: Side effects or medication interactions can make treatment unpleasant enough to stop or make it difficult to tolerate a more effective dose, according to Dr. Bess.
• Depression can be misdiagnosed: “Some people who are diagnosed with depression do not have depression, or they have depression that is caused by a medical problem besides ‘only’ depression,” says Dr. Bess. In these cases, identifying and treating what’s actually driving the symptoms can make all the difference.

What are the symptoms of treatment-resistant depression?

Treatment-resistant depression symptoms are the same as those of major depression. The difference is that they haven’t improved enough with treatment and, in some cases, may be more severe. 

Common symptoms can include:

• Anhedonia (reduced ability to experience pleasure)
• Anxiety
• Appetite changes
• Depressed mood
• Fatigue
• Feelings of worthlessness
• Irritability
• Lack of motivation to engage in various activities
• Lengthy depressive episodes
• Restlessness
• Sleep disturbances (like insomnia or excessive sleeping)
• Suicidal thoughts or behaviors

Why your depression may not be responding to treatment

Usually, there isn’t one simple cause of treatment-resistant depression. Your genetics, brain biology, health history, life experiences, and even the treatment itself can all play a role.

That said, here are some of the factors researchers are exploring:

• Stress response: Your neuroendocrine system helps regulate how your body responds to stress. But when this system becomes dysregulated — which can happen with chronic stress or trauma — it may contribute to depression and potentially make symptoms harder to treat, per research in Frontiers in Pharmacology.
• Neuroplasticity: Neuroplasticity is your brain’s ability to adapt and form new connections. Research in Experimental and Therapeutic Medicine suggests depression can impair this process and make it harder to respond to treatment. 
• Inflammation: Evidence in Cell Death Discovery suggests that ongoing inflammation can affect how the brain functions, including processes involved in mood. That could contribute to both depression symptoms and how well you respond to treatment.
• “Medical mimics:” Sometimes what looks like TRD is actually something else. Common medical problems like thyroid dysfunction, metabolic issues, cardiac conditions, autoimmune disease, vitamin deficiencies, and medication side effects can mimic depressive symptoms and lead to misdiagnosis, per research in The Mental Health Clinician. 

Certain factors are also associated with a greater likelihood of treatment-resistant depression. These include:

• Depression that began at a younger age
• Longer or more severe depressive episodes
• Other mental health conditions
• Chronic health conditions or pain
• A family history of mood disorders
• Childhood trauma or an elevated adverse child experience score
• A history of not responding well to antidepressants

Sometimes, the issue comes down to the treatment itself. You may not be on the right dose or have taken a medication long enough to see its full effects. Side effects can also make it difficult to stick with treatment, and some people simply haven’t had access to other options.

How TRD is diagnosed—and why re-evalulation matters

Treatment-resistant depression is diagnosed by looking closely at your symptoms, treatment history, and how you have responded to different depression treatments.  

“The only way to diagnose TRD is a good old-fashioned interview,” says Dr. Bess. “It is important to get as detailed a history as possible, which can be very challenging because it is difficult for people to remember lots of details, especially when they have had serious mood episodes in the past.”

Your clinician may ask: 

• When you first noticed your symptoms
• The severity of your symptoms and how they show up for you
• What treatments you’ve tried and whether they helped 
• If you have any other medical conditions
• Your family medical history
• Your life experiences or living situation 

“People also tend to have their own narrative about their depression or other psychiatric history — not a fictional narrative, but their own way of [putting] all the pieces together,” Dr. Bess says. “I do my best to start from the beginning and not make any assumptions.”

He adds that understanding a patient’s perspective is an important part of getting the diagnosis right. People may not always recognize certain experiences as symptoms of depression, which is especially common with high-functioning depression. Often, they attribute symptoms to stress, trauma, grief, or simply how they’ve learned to cope. 

Stigma and common misconceptions—like the idea that depression always means feeling sad or crying frequently—can make symptoms easier to overlook, too.

That’s because a diagnosis can be tricky for several reasons. “There is often stigma, self-blame, and/or change in perception about one’s future options,” Dr. Bess says. 

And if you’ve tried multiple treatments without enough relief, your symptoms have changed, or something about your diagnosis or treatment plan doesn’t seem to fit, it may be worth asking for a re-evaluation. “[A diagnosis] is only useful if it then informs what the next steps in assessment and treatment might be,” says Dr. Bess. 

How treatment-resistant depression is treated

If medication or therapy hasn’t brought enough relief from depression, that doesn’t mean you’ve reached the end of your treatment options. Depending on your situation, the next step might include adjusting your medications or exploring a different approach, such as Spravato, TMS therapy, ECT, or psychotherapy.

Here’s how those options compare:

Medication strategies

If your current medication hasn’t helped enough, that doesn’t necessarily mean you should move on from medication altogether. Sometimes the next step is switching antidepressants, adjusting the dose, or adding another medication to help your current treatment work better.

Depending on what you’ve already tried, options may include:

• Traditional antidepressants: A different SSRI, SNRI, or atypical antidepressant may be worth trying, particularly if you haven’t yet had an adequate trial of that type of medication.
• Atypical antipsychotics: Medications like aripiprazole (Abilify), brexpiprazole (Rexulti), or quetiapine (Seroquel) can be added to an antidepressant to help improve its effects. Your provider will help you weigh the potential benefits against possible side effects, including the risk of tardive dyskinesia, an irreversible involuntary movement disorder that can develop with long-term antipsychotic use.
• Lithium (Eskalith): Best known as a mood stabilizer, lithium is sometimes used off-label as an add-on treatment for depression.
• MAOIs (monoamine oxidase inhibitors): These older antidepressants may be an option when other medications haven’t helped, though they require extra care around food and medication interactions.
• Pramipexole (Mirapex): This medication acts on the brain’s dopamine system and is sometimes prescribed off-label for TRD.
• Psilocybin: Psychedelic-assisted treatment is being studied for depression, but psilocybin isn’t currently FDA-approved for TRD.

Esketamine (Spravato)

Esketamine (Spravato) is a prescription nasal spray that works on the brain’s glutamate system, giving people with TRD an option that works differently from traditional antidepressants.

It’s given under medical supervision, and as of 2025, the FDA approved its use as a standalone treatment. 

If you’re considering Spravato treatment at Radial, learn more from our Spravato treatment guide. 

Neuromodulation

TMS for depression uses magnetic fields to stimulate specific areas of the brain involved in depression. By changing activity in these brain circuits over time, TMS may help ease depressive symptoms. 

“When we apply TMS to the neural circuits that are ‘too quiet’ or ‘playing out of sync,’ these patients are often able to find remission from their depression for the first time,” Dr. Hanlon says.  

Another option is implantable vagus nerve stimulation (VNS). A small device that’s surgically implanted under the skin sends electrical signals to the vagus nerve, which communicates with areas of the brain involved in mood. 

Unlike TMS, VNS works continuously and tends to produce improvements gradually over months, making it a longer-term option for people who haven’t responded to other treatments.

Here’s how TMS for depression works and who it’s for.

ECT

Electroconvulsive therapy (ECT) uses a controlled electrical current to trigger a brief seizure while you’re under general anesthesia. It’s typically considered when other treatments haven’t provided enough relief or when severe symptoms need to improve quickly.

Discover how TMS compares to ECT in this guide.

Psychotherapy & lifestyle

Therapy can still play an important role in TRD, even if you’ve tried it before. Common options include:

• Cognitive behavioral therapy (CBT): Helps you recognize and change unhelpful patterns in how you think and respond
• Dialectical behavior therapy (DBT): Builds skills to help you manage difficult emotions, cope with stress, and navigate relationships
• Mentalization-based treatment (MBT): Helps you better understand your own thoughts, feelings, and behaviors, as well as those of other people

Lifestyle habits can support your treatment and overall mental health, too. These might include:

• Getting consistent, quality sleep
• Moving your body regularly
• Eating a balanced, nutritious diet
• Staying connected with friends, family, or your community
• Finding healthy ways to manage stress

Learn more about how cognitive behavioral therapy, dialectical behavior therapy, and mentalization-based treatment work in these guides.

Emerging/experimental options

Researchers are also exploring newer approaches to TRD, including deep brain stimulation, neurofeedback, at-home neuromodulation devices like ProlivRx, and prescription digital therapeutics. Some are still experimental or aren’t FDA-cleared specifically for depression, so cost and insurance coverage can vary as their role in treatment continues to evolve.

Explore at-home depression treatments like ProlivRx in this guide.

The bottom line

Treatment-resistant depression can feel discouraging, especially when you’ve already put time and energy into getting better. But there are still more options to explore, and taking a fresh look at your diagnosis and treatment history can help you find the right path forward.

You don’t have to figure out that next step on your own. A Radial provider or another clinician who specializes in harder-to-treat depression can help you understand your options and find an approach that feels right for you, whether that’s choosing between TMS and Spravato or other options entirely.

Frequently asked questions (FAQs)

What qualifies you for treatment-resistant depression?

Treatment-resistant depression is depression that hasn’t improved enough after trying at least two antidepressants at an adequate dose and for an adequate amount of time. Adequate time is generally considered to be 8-weeks at a therapeutic dose. The specific range for "adequate dose" varies by medication. A provider will also look closely at your symptoms and treatment history before determining whether TRD fits your experience.

What does treatment-resistant depression feel like?

TRD can feel much like major depression, but the symptoms continue despite treatment. You might still experience low mood, loss of interest, fatigue, sleep or appetite changes, trouble concentrating, or other symptoms even after trying multiple treatments.

Is there hope for treatment-resistant depression?

Yes. Treatment-resistant depression can be discouraging, but rest assured you’re not out of options. Re-evaluating your symptoms and care can help you and your provider find an approach that may be a better fit, whether that’s a medication change,  neuromodulation options, or a different type of therapy.

Deep dive recommendations

• Huberman Lab Podcast. Dr. Nolan Williams: Psychedelics & Neurostimulation for Brain Rewiring. 
• Psychiatry and Psychotherapy Podcast. Is Depression a Chemical Imbalance? 
• Psychopharmacology and Psychiatry Updates Podcast. TMS for Depression: From Clinical Trials to Results. 
• Soft White Underbelly. A Talk on New Depression Treatments-Carlene MacMillan, M.D. and Owen Muir, M.D.

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