Depression is one of the most common mental health conditions. For many people, symptoms improve with antidepressant medication, talking therapies or a combination of treatments. However, some continue to experience significant symptoms despite trying several approaches.
When depression does not improve adequately with standard treatment, it may be described as treatment-resistant depression (TRD). This does not mean that someone has done anything wrong or that their condition cannot improve. It simply means the treatments tried so far have not provided sufficient relief, and a different approach or more specialised care may be needed.
This guide explains what treatment-resistant depression is, the symptoms and possible causes, how it is assessed, and the treatment options that may be considered when conventional approaches have not provided enough improvement.
What is Treatment-Resistant Depression?
Treatment-resistant depression typically refers to inadequate improvement in one’s condition after trying two antidepressant medications at an adequate dose and for an adequate length of time.
The term treatment-resistant does not mean that depression is untreatable. It means that the treatments tried so far have not produced enough improvement and that other options may need to be considered.
Symptoms of Treatment-Resistant Depression
The symptoms of treatment-resistant depression are typically the same as those experienced with depression. What distinguishes treatment-resistant depression is that these symptoms continue despite previous treatment and may feel persistent or particularly difficult to shift.
Common symptoms can include:
- Persistent low mood that lasts for most of the day, on most days
- Loss of interest or pleasure in activities once enjoyed
- Fatigue or low energy
- Difficulty concentrating or making decisions
- Changes in sleep, including sleeping too little or too much
- Changes in appetite or weight
- Feelings of worthlessness, guilt or hopelessness
- Thoughts of death, suicide or self-harm
For some people, these symptoms can continue for months or years. Symptoms may improve partially with treatment before returning, or they may persist without significant improvement. This ongoing cycle can be one of the most challenging aspects of living with treatment-resistant depression.
If you are experiencing thoughts of suicide or self-harm, it is important to seek help straight away. You can contact your GP, call NHS 111, or contact the Samaritans on 116 123, free of charge, at any time.
The difference between treatment-resistant depression and regular depression lies in how the condition responds to treatment.
How Is It Different From Regular Depression?
Treatment-resistant depression does not cause different symptoms from depression. The difference lies in how the condition responds to treatment.
For many people with depression, symptoms improve after an appropriate course of treatment, which may include antidepressant medication, psychological therapy or a combination of approaches. The time it takes to notice improvement can vary from person to person.
With treatment-resistant depression, however, symptoms continue to have a significant impact despite appropriate treatment attempts. This does not mean that it cannot be treated. Instead, it may mean the treatments tried so far have not provided enough relief and that a different approach may be needed.
What Causes Treatment-Resistant Depression?
Researchers believe a combination of biological, psychological and practical factors can influence why some depression does not respond to standard treatment.
Factors that may play a part include:
- Biological differences: Variation in brain chemistry and in how individuals process medication may affect how well antidepressants work.
- Severity and duration: More severe or long-standing depression can be harder to treat.
- Coexisting conditions: Anxiety, PTSD, chronic pain or physical health conditions can complicate recovery.
- An incomplete diagnosis: Conditions such as bipolar disorder can be mistaken for depression, which affects which treatments are likely to help.
- Treatment factors: A medication may not have been taken at an effective dose or for long enough to assess its effect properly. Side effects can also make it difficult for some people to continue treatment.
These factors can overlap, and the reasons for ongoing symptoms may be different for each person. This is why a thorough assessment is important when depression has not improved with previous treatment. Reviewing the person’s symptoms, diagnosis, treatment history and overall circumstances can help identify what may be affecting recovery and guide the next steps in their care.
Ketamine may be considered for some people when other appropriate treatments have not provided sufficient relief.
Treatment Options for Treatment-Resistant Depression
When depression has not improved despite previous treatment, it does not mean that there are no options left. Treatment-resistant depression often requires a more detailed review of what has been tried so far and what factors may be contributing to ongoing symptoms.
The most appropriate next step depends on the individual, including their symptoms, diagnosis, treatment history and overall health. A GP, psychiatrist or specialist mental health team can help review the available options.
Reviewing Previous Treatment
Before considering a new approach, it helps to understand why previous treatments may not have provided enough relief. A clinician may review:
- The medications and treatments you have previously tried
- Whether treatments were given at an appropriate dose and for an adequate length of time
- Any side effects that made treatment difficult to continue
- Whether another mental or physical health condition may be affecting recovery
- Your current symptoms and how they are affecting your day-to-day life
This review can help determine whether an existing treatment should be adjusted or whether a different approach may be more appropriate.
Other Treatment Approaches
Depending on the individual, further treatment options may include changing or adjusting antidepressant medication, combining medication with psychological therapy, or considering other treatments recommended for depression that has not responded adequately to standard care. Some people may also benefit from treatment for coexisting mental or physical health conditions that could be contributing to ongoing symptoms.
When Might Ketamine Be Considered?
For some people with treatment-resistant depression, ketamine treatment may be considered when other appropriate treatments have not provided sufficient relief.
Ketamine works differently from conventional antidepressants, acting primarily on the brain’s glutamate system rather than the serotonin system. For some people, this different mechanism may be associated with a more rapid improvement in depressive symptoms.
Ketamine is not a first-line treatment and is not suitable for everyone. Whether it is appropriate depends on the individual’s symptoms, diagnosis, medical history and previous treatment experience.
At Save Minds, ketamine treatment is considered following a comprehensive psychiatric assessment and is delivered in a monitored clinical setting. Your response and progress are reviewed throughout the course of care to help determine the most appropriate ongoing treatment plan.
Start Your Assessment Process for Ketamine Treatment
If you are exploring ketamine treatment after a limited response to previous mental health care, you can contact Save Minds to begin the assessment process. The team can guide you through any referral requirements, arrange a psychiatric suitability assessment and help you understand whether this approach may be appropriate for your circumstances. Every enquiry is handled confidentially, and there is no obligation to proceed.
📞 +44 20 7722 0865
✉️ info@saveminds.co.uk
FAQs
What are the common symptoms of treatment-resistant depression?
The symptoms of treatment-resistant depression are the same as those of depression more generally, including persistent low mood, loss of interest or pleasure in activities, fatigue, difficulty concentrating, and changes in sleep or appetite. What distinguishes treatment-resistant depression is not the symptoms themselves, but the fact that they have not improved sufficiently despite previous treatment. For some people, symptoms can be long-lasting and may fluctuate over time.
How is treatment-resistant depression different from regular depression?
The difference lies in how depression responds to treatment rather than in the symptoms themselves. For many people, depression improves with appropriate treatment, which may include antidepressant medication, psychological therapy or a combination of approaches. With treatment-resistant depression, symptoms have not improved sufficiently despite appropriate treatment attempts, which may indicate that a more detailed assessment or specialist approach is needed.
Is treatment-resistant depression permanent?
No, treatment-resistant depression does not mean that depression is permanent or cannot be helped. The term describes depression that has not responded sufficiently to the treatments tried so far. Some people improve when their treatment is reviewed or adjusted, another condition affecting their recovery is identified, or a different or more specialised treatment approach is considered.
Can ketamine be used to treat treatment-resistant depression?
Ketamine may be considered for some people with treatment-resistant depression when other appropriate treatments have not provided sufficient relief. It works differently from conventional antidepressants and is not considered a first-line treatment. Whether ketamine is appropriate depends on the individual and requires a comprehensive psychiatric assessment.
How might ketamine help with treatment-resistant depression?
Ketamine works differently from many conventional antidepressants. Rather than primarily acting on serotonin, it affects the brain’s glutamate system, which plays an important role in communication between brain cells and neuroplasticity. This different mechanism may help explain why some people experience changes in depressive symptoms more quickly than they would with conventional antidepressants.
