What Is Ketamine Therapy and How Does It Work for Depression?
- Pine Ridge Mental Healthcare
- Feb 25
- 5 min read
Updated: Feb 25
February 25, 2026
Depression can feel relentless — especially when medications and therapy haven’t helped. For individuals struggling with treatment-resistant depression, PTSD, and anxiety, ketamine therapy has emerged as one of the most promising breakthroughs in modern psychiatry.
If you’ve been asking:
How does ketamine treat depression?
Is ketamine safe?
What happens during ketamine therapy?
This guide explains everything clearly you want to know about ketamine and how it works for depression.
Ketamine therapy is a medical treatment that uses low doses of ketamine — originally an anesthetic medication — to rapidly reduce symptoms of depression.
Ketamine has been FDA-approved as an anesthetic since 1970. In recent years, research has shown that at much lower doses, it can dramatically improve mood symptoms, even in patients who have not responded to traditional antidepressants.
There are two primary forms used for depression:
Ketamine oral, nasal, IM, or IV
Intranasal Esketamine (Spravato®) — FDA-approved for treatment-resistant depression
Spravato is the brand name for esketamine, a form of ketamine approved specifically for depression.
How Does Ketamine Treat Depression?
1️⃣ It Works on Glutamate (Not Serotonin)
Traditional antidepressants like Prozac and Zoloft target serotonin.
Ketamine works differently. It targets the glutamate system, which is the brain’s primary excitatory neurotransmitter system.
Specifically, ketamine blocks NMDA receptors, leading to:
Increased glutamate release
Activation of AMPA receptors
Rapid growth of new synaptic connections
This process is called synaptogenesis.
2️⃣ It Promotes Neuroplasticity
Chronic depression is associated with:
Reduced neural connectivity
Shrinkage in mood-regulating brain regions
Impaired stress response systems
Ketamine helps the brain:
Form new neural connections
Repair damaged pathways
Improve communication between mood centers
Many researchers describe ketamine as helping the brain “reset.”
3️⃣ It Works Rapidly
Traditional antidepressants can take 4–8 weeks to show effect.
Ketamine can begin working within:
Hours to days
T
his is particularly important for:
Severe depression
Suicidal thoughts
Treatment-resistant depression
What Is Treatment-Resistant Depression?
Treatment-resistant depression (TRD) is typically defined as:
Depression that has not improved after trying at least two different antidepressant medications at adequate doses and duration.
Approximately 30% of patients with major depressive disorder experience TRD.
For these individuals, ketamine therapy has shown response rates of 50–70% in clinical studies.
What Happens During Ketamine Therapy?
While protocols vary, most treatments follow this structure:
Before Treatment
Medical and psychiatric evaluation
Review of medications
Discussion of goals and expectations
During Treatment
Patient sits or reclines comfortably
Medication administered (IV or nasal)
Monitoring of blood pressure and heart rate
Session lasts 40–120 minutes
Some patients experience:
Dissociation
Mild visual changes
Altered perception of time
Emotional insight
These effects typically resolve within 1–2 hours.
After Treatment
Patient must arrange transportation home
Follow-up appointments scheduled
Maintenance plan discussed
Is Ketamine Safe?
When administered in a controlled medical setting:
Blood pressure is monitored
Dosing is precise
Screening is thorough
Common side effects:
Nausea
Dizziness
Temporary blood pressure elevation
Dissociation
Ketamine is not appropriate for everyone. Individuals with uncontrolled hypertension, active psychosis, or certain substance use disorders may not be candidates.
Benefits of Ketamine for Depression
✔ Rapid symptom relief
✔ Effective for treatment-resistant depression
✔ Reduces suicidal ideation
✔ Works differently than traditional antidepressants
✔ Can enhance psychotherapy outcomes
Frequently Asked Questions (FAQ) on How Ketamine Works
How does ketamine treat depression?
Ketamine treats depression by blocking NMDA receptors in the brain, increasing glutamate release, and promoting rapid neuroplasticity. This leads to the growth of new neural connections and improved mood regulation, often within hours to days.
Is ketamine FDA-approved for depression?
Ketamine itself is FDA-approved as an anesthetic. However, esketamine (Spravato) is FDA-approved for treatment-resistant depression.
Who is a candidate for ketamine therapy?
Ketamine therapy is typically recommended for individuals with:
Treatment-resistant depression
Severe depression
Suicidal thoughts
Poor response to traditional antidepressants
How long do ketamine results last?
Some patients experience improvement after one session. Others require a series (typically 6 sessions over 2–3 weeks). Maintenance treatments may be recommended.
Is ketamine addictive?
At therapeutic doses in a monitored medical setting, the risk of addiction is low. However, ketamine has abuse potential outside of clinical settings.
Frequently Asked Questions About Oral Ketamine and Spravato® Treatment
What is the difference between oral ketamine and Spravato®?
Ketamine is typically compounded as an oral medication (lozenge/troche) and prescribed off-label for depression, PTSD, and anxiety. Spravato is an FDA-approved intranasal form of esketamine used in a certified clinic for treatment-resistant depression. Spravato must be administered under medical supervision with a 2-hour monitoring period, while oral ketamine protocols vary depending on provider guidance.
How should I prepare for a ketamine or Spravato session?
To prepare for treatment:
Avoid alcohol for 24 hours before your session
Avoid heavy meals 2–3 hours beforehand
Get adequate sleep the night before
Wear comfortable clothing
Bring calming music and headphones
Set a simple healing intention
Preparation improves comfort and can positively influence the therapeutic experience.
What does a ketamine session feel like?
Most patients experience:
A floating or dreamlike sensation
Altered perception of time
Emotional shifts
Visual imagery (with eyes closed)
Temporary dissociation
These effects are expected and typically resolve within 1–2 hours.
Looking Ahead: The Future of Ketamine in Mental Health Care
The growing interest in ketamine reflects a broader shift in how we approach mental health treatment. It’s exciting to see new options emerging that offer faster relief and hope for those who have struggled for years.
At Pine Ridge Mental Healthcare, we are committed to providing comprehensive and personalized care. Ketamine is one of the tools we use to support long-term wellness for people of all ages. Whether you’re a parent seeking help for a teen or an adult exploring new treatments, understanding ketamine’s uses can empower you to make informed decisions.
Mental health is a journey, and having access to a range of treatments makes that journey a little easier. Ketamine is opening doors to new possibilities, and I’m hopeful it will continue to help many people find relief and healing.
Interested in some of our other articles on Ketamine and Spravato?
Treatment For Long-Term Success
At Pine Ridge Mental Healthcare, we’ve found success using a variety of approaches to depression, PTSD, and anxiety. Discussing these approaches with a trusted provider is the first and most important step. Getting your symptoms under control is a key to improving how you feel.
Our mental health team works to reduce your reliance on medications by educating you about the different tools available and how life situations can affect your mood. In addition, we help keep you on track with regular check-ins to monitor how you are doing.
For help managing your health, schedule an appointment online or over the phone at Pine Ridge Mental Healthcare in Owasso, Oklahoma. If you are interested in other services we provide, check out our services page.
This content was written and reviewed by Pine Ridge Mental Healthcare, an outpatient psychiatry clinic in Oklahoma. Treatment decisions are made by licensed psychiatric providers based on individual evaluation.
At Pine Ridge Mental Healthcare, we believe everyone deserves compassionate, personalized care. If you or someone you love is struggling, reaching out for help is a brave and important step.
If you want to explore more about how depression impacts your relationships and find resources to support you, visit Pine Ridge Mental Healthcare.
Pine Ridge Mental Healthcare is here to support you. Call us today: (918) 858-4353
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