What Can Ketamine Treat?

​Depression (Treatment-Resistant & Major Depressive Disorder)

Depression is the condition ketamine is best known for treating — and for good reason. The evidence here is stronger than for any other indication. For patients with treatment-resistant depression (meaning two or more antidepressants have not worked), ketamine can produce meaningful symptom relief within hours to days rather than the weeks it takes traditional medications to build up.

Ketamine works by targeting the brain's glutamate system and promoting neuroplasticity — essentially helping the brain form new, healthier connections. This is fundamentally different from how SSRIs and SNRIs work, which is why ketamine can succeed where other treatments have failed. Many patients describe a lifting of the heaviness that depression brings — not just feeling "less bad," but genuinely reconnecting with life. While ketamine is not a cure and effects vary between individuals, it offers real hope for people who have felt stuck for a long time.

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PTSD

PTSD is one of the most treatment-resistant conditions in psychiatry — and one where ketamine shows particularly meaningful promise. Research suggests ketamine can reduce the intensity of intrusive memories, hyperarousal, and avoidance behaviors that define PTSD, sometimes significantly and quickly.

The mechanism is compelling: by promoting neuroplasticity, ketamine may help the brain reprocess traumatic memories with less emotional charge — creating a window where therapy becomes more effective than it has previously been. At Seagrass, we are especially committed to serving veterans, active military, and first responders who carry significant trauma burdens. We offer a 25% discount for military and first responders, and we understand the unique challenges this community faces in seeking and accepting mental health care.

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Suicidal Ideation

One of ketamine's most remarkable and unique properties is its ability to rapidly reduce suicidal thoughts — often within hours of a single infusion. This sets it apart from virtually every other psychiatric treatment available, most of which take weeks to work and offer no specific anti-suicidal effect.

For patients in acute distress or those who have struggled with persistent suicidal thoughts despite other treatments, this rapid effect can be genuinely life-saving. It creates a critical window of safety and hope that allows patients to stabilize, engage more fully in therapy, and begin rebuilding. At Seagrass, we take suicidal ideation seriously and treat it as the medical emergency it is — with compassion, urgency, and evidence-based care.

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Anxiety

While the evidence for ketamine in anxiety disorders is less established than for depression, many patients report meaningful reductions in severe anxiety symptoms following ketamine treatment — particularly when anxiety is intertwined with depression or PTSD. Generalized anxiety disorder, social anxiety, and panic disorder are among the anxiety conditions where patients have reported benefit.

The neuroplasticity that ketamine promotes may help break the rigid, ruminative thinking patterns that fuel anxiety — opening space for calmer, clearer thinking. For patients whose anxiety has not responded to SSRIs, SNRIs, or therapy alone, ketamine may offer a meaningful complement to their existing treatment plan. We always evaluate anxiety in the full context of your mental health history before recommending ketamine.

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Bipolar Depression

Bipolar disorder presents a particular treatment challenge — the depressive episodes are often severe and debilitating, but many standard antidepressants carry a risk of triggering mania or rapid cycling. Ketamine has shown promise specifically for the depressive phase of bipolar disorder, offering rapid relief without the mood-destabilizing risks associated with traditional antidepressants.

That said, ketamine in bipolar disorder requires careful clinical judgment. Patients must be properly screened and stabilized on a mood stabilizer before beginning treatment, and sessions require close monitoring. At Seagrass, your full psychiatric history is reviewed thoroughly before any treatment begins — we do not take a one-size-fits-all approach.

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OCD

Obsessive-compulsive disorder is notoriously difficult to treat, with many patients achieving only partial relief from SSRIs and exposure-based therapy. Emerging research suggests ketamine may reduce the intensity of intrusive thoughts and compulsive urges in some individuals — potentially by disrupting the rigid neural loops that maintain OCD symptoms.

The effects in OCD tend to be shorter-lived than in depression, which means ketamine may be most valuable as part of a broader treatment plan — creating a window where exposure therapy or other behavioral interventions can be more effective. This is still an active area of research, and we approach it honestly: ketamine is not a guaranteed solution for OCD, but for the right patient it may provide meaningful relief when other options have not.

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Anhedonia

Anhedonia — the loss of the ability to feel pleasure, motivation, or connection — is one of the most disabling and hardest-to-treat symptoms of depression and PTSD. Standard antidepressants often leave anhedonia largely untreated even when other depressive symptoms improve, leaving patients feeling emotionally flat or numb.

Ketamine's ability to promote neuroplasticity and increase BDNF (brain-derived neurotrophic factor) appears to have a direct effect on anhedonia — helping restore the brain's reward pathways. Many patients describe this as one of the most meaningful changes they experience with ketamine: the return of genuine interest in life, relationships, and activities they had stopped enjoying. For patients whose primary complaint is emotional numbness rather than sadness, this is worth discussing specifically during your consultation.

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Substance Use Disorder

The relationship between ketamine and substance use disorder is nuanced and worth discussing honestly. Early research — particularly in alcohol use disorder and cocaine dependence — suggests that ketamine may reduce cravings, interrupt habitual patterns, and support early recovery when combined with therapy. The neuroplasticity it promotes may help the brain form new associations and break entrenched addictive cycles.

That said, ketamine itself carries a potential for misuse, particularly in individuals with a history of substance dependence. At Seagrass, we evaluate substance use history carefully and thoughtfully — not to exclude patients, but to ensure ketamine is administered safely and responsibly. For the right patient in recovery, with appropriate support and oversight, ketamine may be a meaningful tool in a broader treatment plan.

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Eating Disorders (Emerging Research)

Research into ketamine for eating disorders — particularly anorexia nervosa and bulimia — is in its early stages, but the early findings are encouraging. Anorexia has one of the highest mortality rates of any psychiatric condition and is notoriously resistant to standard treatment, making new options urgently needed.

Ketamine's ability to promote neuroplasticity and reduce rigid, obsessive thinking patterns may be particularly relevant here — as disordered eating is often maintained by deeply entrenched cognitive patterns that are difficult to shift with therapy alone. At Seagrass, we are open to discussing ketamine as part of a comprehensive treatment plan for patients with eating disorders, always in coordination with their existing treatment team. This is not a first-line treatment and requires careful evaluation, but we believe patients deserve access to every evidence-informed option available.

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ADHD (Emerging Research)

Ketamine for ADHD is one of the newer and less established areas of research, and we want to be transparent about that. The interest stems from ketamine's effects on glutamate and dopamine systems — both of which play a role in attention, executive function, and impulse control. Some early clinical observations suggest patients with ADHD who receive ketamine for co-occurring depression notice improvements in focus and cognitive clarity as well.

This is an area we are watching closely as the evidence develops. At Seagrass, we do not currently position ketamine as a primary treatment for ADHD — but for patients with ADHD alongside treatment-resistant depression or anxiety, it may offer broader benefits than treating mood symptoms alone. If this applies to you, it's worth raising during your consultation so we can discuss it in the context of your full clinical picture.