Treatment for Treatment-Resistant Depression: Your Options

You did what you were supposed to do. You saw a doctor, started an antidepressant, and gave it time. When it didn't help, you tried another. Maybe a third. And you still don't feel like yourself.

If that sounds familiar, you're not alone, and you haven't failed treatment. In STAR*D, the largest real-world study of depression treatment, about a third of people still hadn't recovered after four rounds of treatment. Researchers estimate that about 2.8 million U.S. adults taking medication for depression, nearly 1 in 3, have treatment-resistant depression. When antidepressants aren't working, doctors call it treatment-resistant depression, and it's one of the most active areas of research in psychiatry.

This guide explains what treatment-resistant depression means, what causes it, how to tell whether it applies to you, and the treatment for treatment-resistant depression available when your depression medication isn't working.

Key points

Treatment-resistant depression means depression that hasn't improved enough after at least two antidepressants, each given a fair trial.
It's common: nearly 1 in 3 people taking medication for depression have it.
It isn't permanent, and it isn't your fault. Sometimes earlier treatment never got a fair chance.
Options include different medications, TMS, Spravato, ketamine-assisted psychotherapy and therapy. Many people do best with a combination.
If you're having thoughts of suicide, call or text 988.

What Is Treatment-Resistant Depression? The Definition

The standard definition of treatment-resistant depression (TRD) is major depression that hasn't improved enough after at least two different antidepressants. Each one needs to have been taken at an adequate dose for an adequate length of time, usually at least four to eight weeks. The FDA, European regulators and most insurance plans use this definition, as summarized in a 2023 international expert review in World Psychiatry.

You may also see it called treatment-refractory depression or medication-resistant depression. All three terms mean the same thing.

It also covers partial improvement. If a medication took the edge off but you never felt fully well, that ongoing gap is still a reason to look at other options.

The name can sound like a verdict on you. It isn't. It means the medications you've tried so far weren't the right fit for your brain, not that you did something wrong or that nothing will work.

Is It Really Treatment-Resistant? What to Check First

Before deciding your antidepressants aren't working, it's worth asking whether each one got a fair chance. Doctors have a name for depression that only looks treatment-resistant: pseudo-resistance. The 2023 expert review notes that a significant share of people labeled treatment-resistant fall into this group, usually because earlier medication trials weren't adequate or the medication wasn't taken consistently.

A careful evaluation often turns up one of these:

The dose was too low, or the trial too short. Many people stop a medication at its starting dose, or after two or three weeks, before it could fully work.
Side effects ended it early. A medication you couldn't tolerate isn't the same as one that didn't work.
The diagnosis needs a second look. Bipolar depression can look like ordinary depression but responds differently to antidepressants. Missing it is a common reason treatment stalls.
Something else is keeping depression going. A thyroid problem, sleep apnea, chronic pain, alcohol or substance use, or untreated anxiety, ADHD or PTSD can all hold recovery back.
Life is adding weight. Ongoing stress, trauma or grief can keep symptoms going even when a medication is doing its part.

This is why a specialist evaluation matters before the next step. Looking closely at what you've tried (the doses, how long, and what happened) often changes the plan.

What Causes Treatment-Resistant Depression?

There's no single cause of treatment-resistant depression. Researchers think several factors often work together:

Brain circuit differences. Depression involves networks of brain regions that regulate mood. In some people, these circuits don't respond well to medications that work mainly through brain chemicals like serotonin. That's one reason treatments that act on brain circuits directly, like TMS, can help when pills haven't.
Genetics and metabolism. Your genes affect how fast your body breaks down medications. Some people clear certain antidepressants so quickly that a standard dose never reaches an effective level. International prescribing guidelines now recommend considering a different antidepressant for some of these fast metabolizers.
Inflammation and other medical factors. A 2015 review of 35 studies found that people who didn't respond to antidepressants tended to have higher inflammation before treatment started. Thyroid disorders, hormonal changes and chronic illness can also play a role.
Co-occurring conditions. Anxiety, PTSD, ADHD and substance use often travel with depression and make it harder to treat.
The course of the depression itself. Longer, more severe or repeated episodes are more likely to resist standard treatment.
Stress and trauma. People who experienced abuse or neglect as children are about twice as likely to have long-lasting or recurring depression. They're also more likely to respond poorly to both medication and therapy, according to a review of 26 studies in the American Journal of Psychiatry.

Many of these can be identified and addressed. Understanding why earlier treatment fell short is the first step toward choosing what comes next.

Treatment-Resistant Depression Symptoms: A Self-Check

Treatment-resistant depression doesn't have its own set of symptoms. It's the usual symptoms of depression that stay even after treatment: low mood or emptiness, loss of interest, fatigue, changes in sleep or appetite, trouble concentrating, feelings of worthlessness, and sometimes thoughts of death.

So the more useful question is whether your treatment so far has worked. Ask yourself:

Have I tried two or more antidepressants?
Did I take each one at a full dose for at least six to eight weeks?
Did I improve only partly, or feel better and then slip back?
Did side effects make it too hard to stay on a medication?

If you answered yes to the first two and still don't feel like yourself, you may have treatment-resistant depression. If you're not sure about the doses or how long you took each one, that's worth sorting out. It's the first thing a specialist will look at.

If you're having thoughts of suicide, call or text 988 to reach the Suicide & Crisis Lifeline, or go to the nearest emergency room.

Treatment for Treatment-Resistant Depression: Your Options

When antidepressants aren't working, there are more options than most people realize. The right one depends on your history, your symptoms and what fits your life.

A note on the research numbers below: response means symptoms dropped by at least half, and remission means they're nearly gone. Remission is a high bar, so more people improve in a meaningful way than the remission numbers alone suggest.

Treatment-Resistant Depression Medications

If earlier trials were too short or the dose too low, the first step may simply be giving a medication a proper trial. Beyond that, psychiatrists usually choose among four strategies:

Switching to a different type of antidepressant, such as an SNRI (venlafaxine or duloxetine), bupropion or mirtazapine. Older classes, like tricyclics and MAOIs, are still used when newer medications haven't worked.
Combining two antidepressants that work differently, such as adding bupropion or mirtazapine to an SSRI.
Adding an augmenting medication. Several antipsychotics are FDA-approved as add-ons to an antidepressant for depression, including aripiprazole (Abilify), brexpiprazole (Rexulti), quetiapine XR (Seroquel XR) and cariprazine (Vraylar). Lithium and thyroid hormone are older add-on options.
A medication approved specifically for treatment-resistant depression. Olanzapine-fluoxetine (Symbyax) was the first, in 2009. Spravato, covered below, is the other.

Which strategy works best varies from person to person. In the VAST-D trial of veterans whose depression hadn't responded to an antidepressant, adding aripiprazole led to slightly more remissions (29%) than switching to bupropion (22%). Side effects matter too: add-on antipsychotics can cause weight gain and restlessness, and your provider will weigh that with you.

TMS (transcranial magnetic stimulation)

TMS uses focused magnetic pulses to stimulate the brain circuits involved in mood. It has been FDA-cleared since 2008 for adults with depression who haven't improved enough with antidepressant medication. It also holds up outside of research settings: in a study of 307 patients at 42 U.S. TMS practices, 58% responded to treatment and 37% reached remission, meaning few or no symptoms remained.

There's no anesthesia or downtime: you're awake during each session and can drive yourself home. For people who need a shorter schedule, accelerated TMS fits a full course into fewer days. Learn what to expect from TMS treatment.

Spravato (esketamine)

Spravato is a nasal spray approved by the FDA in 2019 specifically for treatment-resistant depression. Since January 2025, it can be used on its own or alongside an oral antidepressant. In a 2023 head-to-head trial published in the New England Journal of Medicine, 27% of people using Spravato reached remission after eight weeks, compared with 18% of people who added quetiapine, a common add-on medication.

It's given only at certified clinics: you take it on site and stay for at least two hours of monitoring, and you can't drive until the next day. Learn more about Spravato at Houston Mind & Brain.

Ketamine-assisted psychotherapy (KAP)

Ketamine-assisted psychotherapy pairs a dose of ketamine (either Spravato or racemic ketamine) with therapy in the same session. The goal is to use the window ketamine opens to work through what's keeping you stuck. Racemic ketamine is used off-label for depression. Learn more about ketamine-assisted psychotherapy.

Ketamine itself has strong evidence behind it. In a 2023 trial of 403 people with treatment-resistant depression, 55% responded to ketamine. That trial gave ketamine by IV without therapy, so results for other forms may differ.

Psychotherapy

Therapy such as cognitive behavioral therapy (CBT) helps on its own and alongside medication or TMS. Many people do best with a combination rather than any single treatment. Learn about Psychotherapy at Houston Mind and Brain.

Other options

Vagus nerve stimulation (VNS), an implanted device, is FDA-approved for long-term treatment-resistant depression. Other treatments exist for severe depression that hasn't responded to the options above, and your provider can talk through whether any of them makes sense for you.

When Treatment-Resistant Depression Comes With Anxiety

Anxiety and depression often come together, and the combination can be harder to treat. In the STAR*D study, people with anxious depression were less likely to reach remission on their first antidepressant, and took longer to get there.

Some treatments address both. Deep TMS has been FDA-cleared since 2021 to reduce anxiety symptoms in adults with depression, based on data from 573 patients across 11 studies. Therapy approaches like CBT also work on both at once. If anxiety is a big part of what you're dealing with, learn more about our anxiety treatment in Houston.

Finding Treatment-Resistant Depression Treatment Near You

Yes, for most patients — though differently than stimulants. Non-stimulants build up gradually If you're in the Houston area and antidepressants haven't worked, you don't have to figure out the next step alone. Houston Mind & Brain specializes in treatment-resistant depression, led by Dr. Raymond Cho, a psychiatrist with decades of NIH-funded research in neurostimulation.

Our psychiatric providers start with a full review of what you've already tried. We reserve an hour for your consultation, because depression that hasn't responded to treatment takes time to understand medically, psychologically and socially. From there, your plan can include TMS, Spravato, ketamine-assisted psychotherapy, medication management and therapy, all under one roof. Our clinical team typically reviews the progress of every TMS and ketamine patient each week.

Learn more about our depression treatment in Houston, see the insurance plans we accept, or request an appointment to talk through your options.

Contact Houston Mind & Brain

Frequently Asked Questions About Treatment-Resistance Depression

What do they do for treatment-resistant depression? Doctors usually start by reviewing what you've already tried, then adjust or add medications, or move to treatments that work differently, such as TMS, Spravato (esketamine) or ketamine-assisted psychotherapy. Many people do best with a combination. The options section above walks through each one.

What qualifies you for treatment-resistant depression? Most doctors and insurance plans consider depression treatment-resistant after at least two antidepressants haven't brought enough relief, each taken at an adequate dose for an adequate length of time. A careful review sometimes shows an earlier trial didn't count, which can change the next step.

How long does treatment-resistant depression last? There's no set timeline, and it isn't permanent: the label describes how you've responded to past treatment, not what happens next. Without a treatment that works, an episode can last months or years. With the right treatment, many people start to feel better within weeks. A TMS course runs for several weeks, and Spravato can work faster than oral antidepressants for some people.

What should you do when SSRIs don't work? Don't stop on your own, since stopping suddenly can cause withdrawal symptoms or a relapse. Talk with your prescriber. Common next steps include raising the dose, switching to a different type of antidepressant (such as an SNRI or bupropion), adding a second medication, or trying a treatment that works differently, like TMS or Spravato. If you've already tried two or more antidepressants, ask for an evaluation with a psychiatrist who specializes in treatment-resistant depression.

Does insurance cover treatment for treatment-resistant depression? Many plans cover TMS and Spravato for treatment-resistant depression when medical criteria are met. They usually require records of the antidepressants you've already tried.

Can I stay on my antidepressant during TMS or Spravato? Often, yes. Many people continue their medication during TMS, and Spravato can be used with or without an oral antidepressant. Your provider will decide what's right for you.