Your first ketamine infusion: what to expect, start to finish
A practical walkthrough of a first IV ketamine session for depression. What happens in the hour before, during the 40-minute infusion, in recovery, and in the days after.
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TL;DR
- Total time at the clinic: 90-120 minutes. The infusion itself is usually 40 minutes.
- The experience is dissociative, not recreational. Most patients describe it as deeply internal and often emotional.
- You will not remember every second, but you will be aware. You cannot drive home.
- The antidepressant benefit usually builds over 2-4 sessions, not after one. Do not judge the treatment by session one alone.
Most patients walking into a ketamine clinic for the first time have read a lot online and have no idea what their session will actually feel like. This is what a typical first IV ketamine infusion looks like, hour by hour, at a well-run clinic.
The day before
Most clinics will ask you not to eat for 4-6 hours before the session (to reduce the chance of nausea) but to stay well hydrated. No alcohol for 24 hours, no cannabis for the day of the session. Continue all your regular medications unless your prescriber has specifically asked you to pause something.
Arrange a ride. You cannot drive yourself home. Rideshare is fine at most clinics; some require a named contact.
Tell the clinic about anything that changed since your intake: new medications, a cold, a bad night of sleep, a big stressor. Good clinics would rather reschedule than push through a bad context.
Arrival and vitals
You will sit with a nurse or medical assistant for baseline vitals: blood pressure, heart rate, oxygen saturation, weight. They confirm your dose based on weight and any adjustments from your prescriber. You meet the clinician who will run your session.
You settle into the infusion room - usually a reclining chair or a low bed, soft lighting, headphones, an eye mask. Many clinics offer a pre-selected playlist or let you bring your own. Ambient and instrumental are standard; avoid anything with strong lyrics or heavy emotional associations your first time.
An IV catheter goes in (typically the forearm or the back of the hand). The line is flushed, the pump is programmed, and the infusion starts.
The infusion (40 minutes)
The dose ramps up. Within 5-10 minutes you will start to feel the dissociative effects: a sense of distance from your body, softening of physical sensation, visual patterns behind closed eyes, and usually a strong sense that your thoughts are moving or unfolding in an unusual way. The peak dissociation is around minutes 15-30.
What you feel emotionally varies enormously. Some patients describe deep peace. Some cry for the first time in years. Some have memories surface. Some experience what they describe as ego dissolution - a sense that the usual self-commentary quiets down. None of these is the right or wrong experience.
You are monitored continuously. Your nurse or clinician is checking vitals every 5-10 minutes and noting anything unusual. If anything feels alarming - chest tightness, nausea escalating, fear that is not manageable - say so. The infusion can be paused or the dose can be adjusted mid-session.
Recovery (30-60 minutes)
The pump stops. The dissociative effects taper over the next 20-40 minutes. Most patients describe the recovery window as quiet and slightly disoriented. Nausea is possible; anti-nausea medication is usually available. You will be offered water, sometimes a snack.
Before discharge you do a brief debrief with the clinician - how was it, anything surface, any physical concerns. Many clinics use a simple scoring instrument (Clinician-Administered Dissociative States Scale or similar) and a PHQ-9 to track your depression scores over time.
Leaving the clinic
You will feel a little wobbly. Your ride meets you at the clinic. You should not operate machinery, sign legal documents, or make significant decisions for the rest of the day. Plan a quiet evening. Many patients feel mildly euphoric or mildly flat for a few hours.
That night and the next day
Sleep can be unusual the first night. Some patients sleep deeply; others sleep lightly with vivid dreams. This usually resolves after the first session.
The antidepressant effect is not immediate. Some patients describe mood lifting within 24 hours of session one; many do not notice real change until after session 2 or 3. The evidence base is built around a 6-session induction, which is why clinics structure it that way.
Red flags after your first session
Call the clinic immediately if you experience any of: persistent chest pain or pressure, severe persistent headache, dissociative symptoms that do not resolve by the morning after, or new suicidal ideation. These are rare but real, and good clinics have a 24-hour contact line for exactly this.
What to bring to session two
Notes. Whatever came up - images, memories, insights, feelings, confusions - bring it to your next session or to your integration appointment. Ketamine has its strongest long-term effects when paired with some form of integration, whether that is your existing therapist, a specialized integration coach, or a clinic that provides it in-house.
The infusion itself is only the smaller half of the treatment. What you do with what it surfaces is the rest of it.