Ketamine Therapy for Depression: Everything You Need to Know in 2026

Depression affects over 280 million people worldwide, and for roughly 30% of them, traditional antidepressants don't work. Ketamine therapy can produce noticeable mood improvement within hours rather than weeks — one of the most significant breakthroughs in psychiatric treatment in decades.

How Ketamine Works for Depression

Ketamine is an NMDA receptor antagonist that blocks glutamate from binding to NMDA receptors, triggering a rapid cascade of downstream effects distinct from SSRIs:

• Increased BDNF release: Brain-derived neurotrophic factor surges, promoting neuron growth
• Synaptic plasticity: New synaptic connections form within hours, helping rewire degraded neural circuits
• mTOR pathway activation: Facilitates protein production needed for new synapses

Who Is Ketamine Therapy For?

Ketamine is primarily indicated for treatment-resistant depression (patients who haven't responded to two or more antidepressants), major depressive disorder with suicidal ideation, and bipolar depression. It is generally not recommended for patients with uncontrolled hypertension, active psychosis, active substance use disorders, or pregnancy.

Types of Ketamine Treatment

IV infusions ($400-$800/session) are the gold standard with ~100% bioavailability. Spravato (FDA-approved nasal spray) may be covered by insurance. Sublingual telehealth programs cost $150-$450/month and allow at-home treatment. IM injection (~93% bioavailability) is often less expensive than IV at $300-$600/session.

Success Rates and Research

60-70% of treatment-resistant patients respond to IV ketamine (defined as 50%+ reduction in depression scores), with approximately 30-40% achieving full remission. Significant improvement often occurs within 24 hours of the first infusion. A 2006 Zarate et al. study showed 71% of treatment-resistant patients responded within 24 hours of a single infusion.

What to Expect During Treatment

Before your session: medical screening, medication review, and fasting 4-6 hours for IV/IM. During infusion: dissociative effects including floating sensations, altered time perception, and visual distortions. Blood pressure and heart rate are monitored throughout. After: monitored for 15-30 minutes; cannot drive for the rest of the day. Some patients feel improvement the same evening; for others, it takes 1-3 sessions.