When Standard Antidepressants Stop Working: Ketamine Infusion Therapy for Depression and Anxiety
Antidepressants are life-changing for many—but not all. If you've cycled through several meds with no relief, you're not alone, and it's not your fault.
Your brain might just need a different route. Ketamine infusion therapy is one such option. It's long been used in medicine, though its application for depression and anxiety is newer.
Here's why some people don't respond to standard treatments, how ketamine works, and what the process involves.
Why Some People Don't Respond to Antidepressants
SSRIs and SNRIs work for many. For others, they do nothing. Or they work for a while and then stop.
It's Not a Simple Chemical Imbalance
The old theory said depression was simply low serotonin. Science has moved past that. It's more about how brain cells talk to each other, inflammation, stress hormones, and neuroplasticity. Targeting serotonin alone might only scratch the surface.
How Common Is Treatment Resistance?
Here's what the numbers look like:
About 30 to 50 percent of people don't get full relief from their first or second antidepressant
When two or more meds fail, it's called treatment-resistant depression (TRD)
TRD affects roughly one-third of people with major depression
It's linked to more disability and higher suicide risk
It's Not About Trying Harder
Treatment resistance isn't about willpower. It's biology. Some brains need a different approach.
How Ketamine Works Differently
Ketamine doesn't touch serotonin. It works on glutamate, a completely different system.
The Glutamate Connection
Ketamine blocks NMDA receptors in the brain. Glutamate is the main chemical for learning, memory, and mood. When ketamine blocks those receptors, it kicks off a chain reaction that helps brain cells communicate again.
Building New Connections
One of the key ways ketamine helps is by encouraging the brain to rebuild itself.
Ketamine helps grow new neural connections
It boosts BDNF, a protein that keeps neurons alive
This process—synaptogenesis—may help reset mood and thought patterns
Yale researchers found ketamine triggered new synapse growth in the prefrontal cortex
Faster Than Traditional Meds
Traditional antidepressants take 4 to 8 weeks. Ketamine can work in hours or days. That speed matters when someone is in crisis.
Ketamine for Depression: What the Research Shows
The evidence for ketamine in treatment-resistant depression is strong.
Response Rates
The numbers for ketamine in treatment-resistant depression are encouraging.
Short-term response rates for IV ketamine are 60 to 70 percent
50 to 70 percent of TRD patients respond
Many feel relief within hours to days
Suicidal Thoughts Drop Fast
A 2019 study in The American Journal of Psychiatry found ketamine reduced suicidal ideation within 4 hours. That's significant for people in acute crisis.
How Long Do Effects Last?
One infusion can reduce symptoms within a day. Effects usually last three to seven days. Maintenance infusions can extend that relief.
Ketamine for Anxiety: What We Know
The research on anxiety is newer, but it's growing.
Anxiety Relief
Ketamine has been shown to rapidly reduce anxiety symptoms. In the first placebo-controlled trial for social anxiety, a single dose significantly reduced anxiety compared to placebo.
Anxiety and Depression Often Go Together
Anxiety and depression frequently show up together. A real-world study of IV ketamine found both depression and anxiety scores dropped. Anxiety improved more slowly, but it did improve.
Severe, Stubborn Anxiety
For people with severe anxiety who haven't responded to standard treatments, ketamine may be worth exploring. Case studies show improved control when other options failed.
What Treatment Looks Like
Ketamine infusion is a medical procedure. Not something to try on your own.
Step 1: Consultation
You meet with a physician first. They review your history, symptoms, medications, and goals. The point is to figure out if ketamine is safe and appropriate for you.
Step 2: Personalized Plan
If ketamine makes sense, the doctor builds a plan. That includes dose, number of sessions, and how often you come in. A typical course is six infusions over two to three weeks.
Step 3: The Infusion
The infusion itself is straightforward and closely supervised.
Done in a private, comfortable room
A medical professional monitors you the whole time
Blood pressure, heart rate, and oxygen are checked regularly
Sessions usually last 40 to 60 minutes
Step 4: Follow-Up
After the first series, your doctor reviews how you're doing. Some people need maintenance infusions. Others don't. The plan adjusts based on your response.
Safety and Oversight
Ketamine is safe when given by trained medical professionals. But it's not for everyone.
Who Should Not Get Ketamine
Ketamine is not safe for everyone. Certain conditions rule it out.
History of psychosis
Uncontrolled high blood pressure
Recent heart attack
Liver disease
History of substance use disorder
Pregnancy or breastfeeding (talk to your doctor)
What Monitoring Looks Like
You're monitored throughout the infusion. Side effects like temporary blood pressure spikes, mild dissociation, nausea, and perceptual changes are common. They usually fade after the session.
What It Feels Like
Most people describe the experience as unusual but not unpleasant.
Mild dissociation
Feeling detached or dreamlike
Time feeling different
Relaxation
These effects wear off soon after the infusion ends.
Finding a Clinic
In the Metro Detroit area, Betterclinix in Grosse Pointe provides physician-guided ketamine infusion therapy with a personalized, holistic approach. Their services include ketamine infusion for depression and anxiety, plus IV therapy, medical weight loss, and peptide therapy. The clinic is led by licensed Michigan providers.
Visit betterclinix.co for more information or to schedule a consultation.
