Treatment-Resistant Depression: Signs, Causes and When to Get Help
Treatment-resistant depression is depression that has not improved after two or more treatments. Learn the causes, what to check, and options like augmentation, TMS and esketamine.
Treatment-resistant depression (TRD) is major depression that has not responded adequately to at least two antidepressant trials at sufficient dose and duration. It affects roughly 30% of people with depression. Next steps include reviewing the diagnosis and contributing factors, optimizing or switching medication, augmentation (for example with lithium or an atypical antipsychotic), adding psychotherapy, TMS, esketamine nasal spray and ECT.
Key takeaways
- Up to about a third of people with depression meet criteria for treatment resistance.
- “Resistant” does not mean untreatable; many people respond to next-step options.
- Hidden causes such as bipolar disorder, thyroid disease, sleep apnea and substance use must be checked.
- Augmentation, TMS, esketamine and ECT have strong evidence.
- Combining therapy with medication improves outcomes.
You have tried one antidepressant, then another. Maybe you have been in therapy for months. You are taking your medication faithfully, yet the heaviness, exhaustion and hopelessness remain. It is easy to feel that nothing will work, or that something is wrong with you.
Nothing is wrong with you. Treatment-resistant depression is common and well studied, and many people who did not respond to early treatments go on to feel much better. In the large STAR*D study, about two-thirds of participants eventually reached remission across up to four treatment steps. This guide explains what TRD is, why it happens, what should be reviewed, and the full range of next-step treatments. See also depression treatment.
What is treatment-resistant depression?
Most clinicians define TRD as major depressive disorder that has not improved enough after at least two different antidepressants, each taken at an adequate dose for an adequate time (usually 6 to 8 weeks or more) with good adherence. “Response” usually means at least a 50% reduction in symptoms; “remission” means few or no symptoms. Some people have partial response, improving somewhat but not enough to feel well, which also deserves further treatment.
What should be reviewed first
Before labeling depression as treatment-resistant, a careful review looks for factors that keep depression from improving:
| Factor | Why it matters |
|---|---|
| Diagnosis | Bipolar depression, ADHD, PTSD or personality factors need different treatment |
| Medication trials | Doses that were too low, too short, or not taken consistently |
| Medical conditions | Thyroid disease, anemia, vitamin deficiencies, sleep apnea, chronic pain, inflammation |
| Substance use | Alcohol and cannabis can blunt antidepressant response |
| Medications | Some drugs, such as steroids or certain blood pressure medications, can worsen mood |
| Ongoing stressors | Abuse, conflict, financial or work stress |
| Sleep | Untreated insomnia worsens depression |
A second opinion consultation is a smart step when depression has not improved.
Treatment options for treatment-resistant depression
Optimize the current medication
Increase the dose if tolerated and allow enough time.
Switch
Change to an antidepressant with a different mechanism.
Augmentation
Add a second medication such as lithium, thyroid hormone or an FDA-approved atypical antipsychotic.
Combination antidepressants
Use two antidepressants with complementary actions.
Add psychotherapy
CBT, behavioral activation or interpersonal therapy improve outcomes when added to medication.
Transcranial magnetic stimulation (TMS)
FDA-cleared, non-invasive magnetic stimulation of mood circuits, typically daily sessions over several weeks.
Esketamine nasal spray
FDA-approved for TRD, administered in certified clinics with monitoring; can act within days.
Electroconvulsive therapy (ECT)
One of the most effective treatments for severe or treatment-resistant depression, done under anesthesia.
Comparing advanced options
| Option | How fast | Considerations |
|---|---|---|
| Augmentation medications | 2 to 6 weeks | Side effects and monitoring vary by medication |
| TMS | 3 to 6 weeks of sessions | Daily visits; generally well tolerated |
| Esketamine | Days | Clinic administration, monitoring for dissociation and blood pressure |
| ECT | 1 to 3 weeks | Anesthesia; possible short-term memory effects; very effective |
Supporting recovery
- Regular exercise, which has antidepressant effects
- Consistent sleep and treatment of insomnia
- Reducing alcohol and cannabis
- Daily structure and behavioral activation
- Social connection and support
Who is more likely to have TRD?
Risk is higher with longer or recurrent depressive episodes, early onset, co-occurring anxiety, chronic medical illness, trauma history, and substance use. Undiagnosed bipolar disorder is a common reason antidepressants seem not to work. Read more about signs of bipolar disorder.
When to seek specialist help
If you have tried two treatments without enough improvement, ask about a comprehensive re-evaluation. Seek urgent help for thoughts of suicide: call or text 988 or go to the nearest emergency room.
How GraceBridge Psychiatry can help
GraceBridge Psychiatry provides secure online psychiatric care for adults in Texas, Arizona and Washington. Care starts with a comprehensive psychiatric evaluation, followed by a personalized treatment plan that may include therapy referrals, lifestyle strategies and medication management when appropriate. Learn more about how we treat depression. Most new patients are seen within days. See insurance we accept and self-pay pricing.
- Free consultation call: tell us what is going on.
- Book your evaluation: meet a board-certified provider by secure video.
- Get your plan: clear next steps and follow-up until you feel better.
Frequently asked questions
What is treatment-resistant depression?
Depression that has not improved enough after at least two adequate antidepressant trials.
How common is treatment-resistant depression?
About 30% of people with major depression meet criteria for TRD.
What causes treatment-resistant depression?
Possible factors include misdiagnosis, inadequate trials, medical conditions, substance use, ongoing stress and biological differences.
What are the treatment options for TRD?
Optimizing or switching medication, augmentation, combination therapy, psychotherapy, TMS, esketamine and ECT.
What is TMS?
Transcranial magnetic stimulation, a non-invasive, FDA-cleared treatment using magnetic pulses to stimulate mood circuits.
What is esketamine?
An FDA-approved nasal spray for TRD given in certified clinics with monitoring.
Is ECT safe?
ECT is safe under anesthesia and one of the most effective treatments for severe depression; short-term memory effects can occur.
Can therapy help treatment-resistant depression?
Yes. Adding psychotherapy to medication improves outcomes.
Could my depression actually be bipolar disorder?
Possibly. Undiagnosed bipolar disorder is a common reason antidepressants do not work.
How long should I try an antidepressant?
Usually 6 to 8 weeks at an adequate dose before deciding it is not working.
Can thyroid problems cause depression?
Yes. Thyroid disorders can cause or worsen depression.
Is treatment-resistant depression permanent?
No. Many people respond to next-step treatments.
What is augmentation?
Adding a second medication to boost an antidepressant’s effect.
Can I get a second opinion for my depression?
Yes. GraceBridge offers second opinion consultations online.
What if I feel hopeless?
Please reach out. Call or text 988 or go to the nearest emergency room if you have thoughts of suicide.
Sources
- Rush AJ, et al. Acute and longer-term outcomes in depressed outpatients requiring one or several treatment steps: STAR*D. Am J Psychiatry. 2006;163(11):1905-1917.
- McIntyre RS, et al. Treatment-resistant depression: definition, prevalence, detection, management. World Psychiatry. 2023;22(3):394-412.
- FDA. FDA approves new nasal spray medication for treatment-resistant depression (2019)
- 988 Suicide & Crisis Lifeline