If you have been living with depression that has not responded to medication, there is a good chance you have come across ketamine therapy in your research. The clinical results are compelling, the mechanism is different from anything that came before it, and the speed of response is unlike any other treatment in psychiatry. But the question most patients arrive with is not “does ketamine work.” It is “does ketamine work for someone like me?” This post answers that question directly. It covers who ketamine therapy is designed for, what the clinical criteria look like in practice, what the evaluation process involves, and what to do if you are not sure whether you qualify. What Ketamine Therapy Is Designed For Ketamine therapy was not developed as a first-line treatment for mild depression. It exists specifically for patients whose depression has not responded adequately to standard treatments, a population that is larger than most people realize. Approximately one in three patients with major depressive disorder does not achieve remission with their first antidepressant. A significant proportion of those patients cycle through multiple medications over months or years without finding adequate relief. For these patients, the standard pharmacological toolkit has been exhausted or has proven insufficient, and something with a fundamentally different mechanism is needed. Ketamine fills that role. It works through the glutamate system rather than the serotonin or norepinephrine systems targeted by traditional antidepressants, which is why it often produces meaningful results in patients who have failed multiple SSRI or SNRI trials. The mechanism is different enough that prior medication failures do not predict ketamine failure. The Core Candidacy Criteria While every patient is evaluated individually, the following criteria describe the profile of a strong ketamine candidate. You do not need to meet every single criterion, but the more that apply to your situation, the more likely ketamine is an appropriate next step. You Have a Diagnosis of Major Depressive Disorder, Bipolar Depression, PTSD, or Anxiety Ketamine has the strongest evidence base for major depressive disorder, particularly treatment-resistant presentations. It also has meaningful clinical evidence for bipolar depression, PTSD, and anxiety disorders. If your primary diagnosis falls within one of these categories, you are within the population ketamine is designed to serve. You Have Tried at Least One Antidepressant Without Adequate Relief Most ketamine providers, including NeuPath, look for a documented history of at least one antidepressant trial that did not produce sufficient improvement. This does not mean the medication did nothing. It means the response was inadequate, either because symptoms did not improve enough or because side effects made the medication intolerable. Many patients seeking ketamine have tried far more than one medication. If you have cycled through two, three, four, or more antidepressants without finding lasting relief, your candidacy for ketamine is stronger, not weaker. You Are Experiencing Significant Functional Impairment Ketamine is most appropriate for patients whose depression is meaningfully affecting their quality of life, their ability to work, their relationships, or their daily functioning. If your symptoms are mild and your current treatment is providing reasonable relief, ketamine is unlikely to be the recommended next step. If your depression is significantly impairing your life and current treatments are not adequately addressing it, the clinical bar for ketamine is met. You Are Not in a Substance Use Crisis Ketamine has a potential for misuse, and active substance use disorders, particularly involving alcohol, benzodiazepines, or dissociative substances, require careful evaluation before ketamine is considered. This does not mean a history of substance use disqualifies you. It means your psychiatrist needs a complete picture of your current relationship with substances to make an informed clinical judgment. You Do Not Have Uncontrolled Hypertension or Certain Cardiovascular Conditions Ketamine transiently elevates blood pressure and heart rate during infusions. Patients with well-controlled hypertension can typically receive ketamine safely with appropriate monitoring. Patients with uncontrolled hypertension or certain serious cardiovascular conditions require more careful evaluation and may need medical clearance from a cardiologist before proceeding. You Are Not Currently Experiencing Active Psychosis Ketamine is a dissociative agent and can exacerbate psychotic symptoms. Patients with a history of schizophrenia, schizoaffective disorder, or active psychosis are generally not appropriate candidates for ketamine therapy. Patients with a history of psychotic depression who are currently stable require individual evaluation. Special Populations Worth Knowing About Patients With Suicidal Ideation Ketamine has shown remarkable results for patients with active suicidal ideation. Its rapid mechanism of action, producing meaningful relief within hours rather than weeks, makes it one of the few treatments capable of intervening quickly in a suicidal crisis. If suicidal ideation is part of your clinical picture, it is not a barrier to ketamine. In many cases it is one of the strongest arguments for it. Patients Who Are Pregnant or Breastfeeding Ketamine is not recommended during pregnancy or breastfeeding. If you are pregnant, your psychiatrist will discuss alternative treatment options appropriate for your situation. Patients on Certain Medications Some medications interact with ketamine in ways that require adjustment before treatment begins. Lamotrigine, for example, may reduce ketamine’s effectiveness. High-dose benzodiazepines can blunt the dissociative response. Your psychiatrist will review your full medication list during the evaluation and advise on any adjustments needed before your first infusion. What the Evaluation Process at NeuPath Looks Like Before any ketamine infusion begins at NeuPath Mind Wellness, you will have a comprehensive psychiatric evaluation with one of our psychiatrists. This is not a formality. It is the foundation of safe and effective treatment. During the evaluation your psychiatrist will review your full psychiatric history including all previous diagnoses, medications you have tried and your response to them, any history of substance use, your current symptoms and their severity, and any medical conditions that may be relevant to ketamine candidacy. You will also have the opportunity to ask every question you have about the treatment, the expected experience, the potential side effects, and what success looks like. Our psychiatrists take the time to make sure you have a complete and honest