For those who feel like nothing has helped their depression, Spravato® (esketamine) offers a promising new approach that targets the brain in a completely new way. However, it’s natural to wonder how does Spravato work in the brain.
Spravato is a nasal spray form of ketamine approved by the US Food and Drug Administration (FDA) to treat adults with treatment-resistant depression (TRD) and major depressive disorder (MDD) with suicidal thoughts.
Unlike most antidepressants that adjust serotonin or norepinephrine levels over time, Spravato targets glutamate, the brain’s most common chemical messenger. Spravato can quickly “reawaken” areas of the brain affected by depression. This helps repair neural connections and improve mood regulation, often within hours or days of treatment.
How does Spravato work in the brain?
Spravato works by temporarily blocking N-methyl-D-aspartate (NMDA) receptors, which are key components of the brain’s glutamate system. In people with depression, these receptors can become overactive or misregulated, leading to disrupted brain signaling and low mood.
By blocking NMDA receptors, Spravato increases the activity of nearby brain cells that rely on glutamate. This boost in communication helps jump-start areas of the brain that have become “quiet” or underactive due to chronic depression.
The effect is especially strong in two key regions:
- The prefrontal cortex, which helps regulate mood and decision-making.
- The hippocampus, which is involved in learning, memory, and emotional processing.
Together, these changes help reestablish healthier brain activity patterns, often within just a few hours of treatment.
Boosting glutamate and brain communication
Glutamate is the most abundant excitatory neurotransmitter in the brain. It helps billions of nerve cells send messages quickly and efficiently. When Spravato increases glutamate activity, it essentially helps neurons “wake up” and start communicating again.
This boost in communication:
- Activates AMPA receptors, another set of glutamate receptors that rapidly enhance signal transmission
- Creates more balanced, flexible brain networks that support positive thinking and problem-solving
- Helps break cycles of negative thought and rumination common in depression
Patients often describe the experience as feeling like their mind has “reset” or “opened up” after treatment. It’s an effect supported by brain imaging studies that show greater connectivity between mood-regulating regions after Spravato sessions.
Supporting brain plasticity and new growth
Another key part of how Spravato works in the brain is its ability to promote neuroplasticity, the brain’s natural capacity to form new connections and repair old ones.
After Spravato increases glutamate signaling, it triggers a cascade of beneficial changes:
- The brain releases more brain-derived neurotrophic factor (BDNF,) a protein that helps neurons grow and stay healthy.
- It activates the mTOR pathway, which supports protein production needed to form new neural connections.
- It stimulates synaptogenesis, the creation of new synapses that strengthen brain communication.
This process is like fertilizing a garden. New growth replaces damaged or weakened connections caused by depression, helping the brain function more flexibly and efficiently.
Over time, this improved communication leads to lasting mood improvements and greater emotional resilience.
Restoring brain regions affected by depression
Chronic depression can cause measurable changes in brain structure, particularly in the hippocampus, which can shrink by up to 20% in people with long-term depression. This affects memory, emotional control, and stress response.
Spravato helps reverse this damage by:
- Promoting new neuron growth in the hippocampus
- Restoring communication between the hippocampus, amygdala, and prefrontal cortex
- Normalizing brain activity across networks involved in mood and attention
These structural improvements can enhance not only mood but also focus, energy, and emotional regulation, helping patients feel more stable and capable in daily life.
Comparing Spravato to traditional antidepressants
Traditional antidepressants like selective serotonin reuptake inhibitors (SSRIs) or serotonin-norepinephrine reuptake inhibitors (SNRIs) work by slowly increasing the levels of certain neurotransmitters in the brain. This gradual process can take at least four to six weeks before patients notice significant improvement.
Spravato, on the other hand, acts on the glutamate system, which affects nearly every area of the brain at once. This is why some patients experience relief within hours or days rather than weeks.
Other differences include:
| Spravato (Esketamine) | Traditional Antidepressants (SSRIs/SNRIs) |
| Works on the glutamate system | Works on serotonin/norepinephrine |
| Acts within hours to days | Takes weeks to build up |
| Promotes new brain connections | Adjusts chemical levels |
| Used for treatment-resistant depression | Used for first-line depression |
This unique mechanism makes Spravato especially helpful for patients who haven’t responded to several traditional antidepressants.
Timeline of brain changes
Spravato’s effects on the brain unfold in stages:
- Within hours: NMDA receptors are blocked, and glutamate activity increases. Patients may notice a lighter mood or mental clarity.
- Within 1–2 days: BDNF levels rise, and new synapses begin forming.
- Within 1–2 weeks: Neural communication strengthens, and mood symptoms often improve.
- Over 4–8 weeks: Structural brain changes, like increased hippocampal connectivity, continue to develop.
- Maintenance phase: Regular sessions (weekly or biweekly) help sustain these brain changes and prevent relapse.
This timeline explains why many patients begin feeling relief early and maintain progress with consistent treatment.
Summary
Spravato represents one of the most significant breakthroughs in depression treatment in decades. By targeting the brain’s glutamate system, it helps restore healthy communication, build new neural connections, and relieve symptoms much faster than traditional medications.
For patients living with treatment-resistant depression, understanding how Spravato works in the brain highlights why this therapy can be life-changing, offering renewed hope and a faster path to feeling well again.
Frequently asked questions
How quickly does Spravato start working in the brain?
Spravato begins affecting NMDA receptors and increasing glutamate within hours of administration. Many patients report mood improvements within the first day or two, with continued benefits after each session.
Does Spravato permanently change the brain?
Spravato encourages the brain to form new, healthy connections, but it doesn’t cause permanent or harmful changes. These new pathways can last for months — and sometimes longer — when supported with ongoing therapy and healthy habits.
Why does Spravato work faster than other antidepressants?
Unlike traditional antidepressants that adjust chemical levels slowly, Spravato rapidly increases glutamate activity and boosts brain plasticity. This leads to faster neural repair and symptom relief.
Can Spravato repair brain damage from depression?
Research shows Spravato can reverse some of the structural effects of chronic depression, especially in the hippocampus. It helps restore brain connectivity, improving both mood and cognitive function.
How long do the benefits last after stopping Spravato?
Many people maintain significant improvements for weeks or months after completing treatment. Maintenance sessions or continued therapy can help extend these results.
Key takeaways
- Spravato® (esketamine) works differently than traditional antidepressants — it targets the glutamate system, the brain’s main excitatory network.
- By blocking NMDA receptors, Spravato increases glutamate activity and helps brain cells communicate more effectively.
- The treatment boosts BDNF (brain-derived neurotrophic factor) and activates pathways that help the brain form new connections.
- These changes can restore damaged brain circuits involved in mood, memory, and emotion — especially in areas like the hippocampus.
- Because of its unique mechanism, Spravato can begin reducing depression symptoms within hours or days, rather than the weeks required by standard antidepressants.
Looking for Spravato or ketamine treatment near you?
Pacific Mind Health offers Spravato (esketamine) and ketamine therapy for treatment-resistant depression, major depressive disorder, and more. Our experienced clinicians provide compassionate, evidence-based care to help you feel better.
Ready to take the next step? Schedule a free consultation today to see if Spravato or ketamine is right for you.
