Spravato (esketamine nasal spray) produces a distinct set of sensations that most people notice within 20 minutes of taking it. The most common experience is dissociation, a temporary feeling of detachment from your body or surroundings, often accompanied by dizziness, drowsiness, and sometimes nausea. These acute effects typically peak around 40 minutes after the dose and fade within about two hours, though some lingering sleepiness can last up to four hours.
What Dissociation Actually Feels Like
The signature sensation of Spravato is dissociation, and it’s worth understanding what that word means in practice. You may feel disconnected from your environment, as though you’re observing things from a slight distance. Some people describe a dreamlike quality, where time seems to stretch or compress and your surroundings feel unfamiliar or unreal. Others notice changes in how their body feels: numbness, tingling, or a sense that your limbs don’t quite belong to you.
For some people, this is mild and even pleasant. For others, the confusion and loss of awareness of the external environment can feel overwhelming, especially during the first session. In clinical reports, some patients experienced agitation and confusion that began about 20 minutes after dosing and lasted roughly 40 minutes. The feelings of detachment can cause real anxiety if you’re not expecting them. Knowing this is temporary and a normal pharmacological effect, not a sign that something is wrong, makes a significant difference in how well people tolerate it.
The Physical Side Effects
Beyond the mental and perceptual changes, Spravato causes a cluster of physical sensations. In clinical trials, the most commonly reported side effects were:
- Dizziness: reported by about 39% of patients
- Altered taste: a metallic or unpleasant taste in the mouth, affecting roughly 23%
- Nausea: around 16%
- Headache: about 14%
- Sedation or drowsiness: roughly 11%
Some people also experience vertigo (a spinning sensation), numbness or tingling in the hands and face, and a temporary rise in blood pressure. The blood pressure increase peaks at about 40 minutes and generally resolves within four hours. You won’t typically feel this happening, but it’s the reason your blood pressure is checked during and after every session.
The Timeline of a Session
Spravato is administered as a nasal spray in a healthcare setting, not at home. You’ll spray the medication yourself under supervision, and the drug reaches peak levels in your blood within 20 to 40 minutes. That 40-minute mark is when most of the acute effects, both the dissociation and the physical side effects, are at their strongest.
Cognitive function, meaning your ability to think clearly, process information, and react normally, typically returns to baseline within about two hours. Sleepiness can linger a bit longer, taking up to four hours to fully wear off. You’re required to stay at the clinic for at least two hours after dosing so staff can monitor your vital signs and make sure you’re stable before leaving. You’ll also need someone to drive you home, since driving isn’t safe for the rest of the day after treatment.
How It Affects Your Mood
The acute sensations during a session are separate from the antidepressant effect, and it’s important not to confuse the two. The dissociation and dizziness are temporary side effects of the drug passing through your system. The mood improvement works through a different mechanism: Spravato blocks a specific receptor in the brain, which triggers a rapid increase in glutamate signaling. This burst of activity helps strengthen neural connections that depression has weakened.
The speed of this antidepressant effect is what sets Spravato apart from traditional antidepressants. In clinical trials of patients with treatment-resistant depression, most of the measurable improvement in depression scores appeared within 24 hours of the first dose. In studies of patients with major depression and active suicidal thoughts, a statistically significant reduction in symptoms was first detectable at just four hours after dosing. This doesn’t mean you’ll feel completely different after one session, but many people notice a shift in mood, energy, or emotional heaviness much faster than with oral antidepressants, which typically take weeks.
That said, the initial treatment phase involves twice-weekly sessions for the first month, then weekly or every-other-week sessions after that. The antidepressant benefit builds and stabilizes over this schedule. Some people feel a noticeable lift early on; others need several sessions before the cumulative effect becomes clear.
What Changes After Repeated Sessions
Many patients find that the dissociative side effects become less intense over time as their body adjusts to the medication. The first and second sessions tend to produce the strongest acute reactions, partly because the experience is unfamiliar. Knowing the timeline, that the peak hits around 40 minutes and resolves within a couple of hours, helps people feel less anxious during later sessions.
The mood-related benefits, by contrast, tend to strengthen with continued treatment. The goal is sustained improvement in depressive symptoms, not just the temporary shift that happens during a single session. Some people describe the cumulative effect as a gradual lifting of the heaviness or emotional flatness that characterizes treatment-resistant depression, a feeling that the world has color again or that getting through the day no longer requires enormous effort.
What to Expect at Your First Appointment
If you’re preparing for your first Spravato session, a few practical details help set expectations. You’ll be asked to avoid eating for at least two hours before treatment and to avoid drinking liquids for at least 30 minutes before, since nausea is a common side effect. If you take a nasal decongestant or corticosteroid spray, use it at least an hour beforehand so your nasal passages can absorb the medication properly.
During the session, you’ll be seated in a comfortable chair, often with the option to recline. Staff will check your blood pressure before dosing, again at about 40 minutes, and as needed until it stabilizes. You’ll likely want to close your eyes and sit quietly during the peak effects. Some clinics offer eye masks or calming music. Bringing a trusted playlist or a comfort item is reasonable.
The two-hour monitoring period can feel long, especially once the acute effects start fading and you’re ready to leave. Bring something low-key to pass the time for the tail end of the session. Plan for a quiet evening afterward, since residual drowsiness is common and you won’t be able to drive, operate heavy machinery, or make important decisions for the rest of the day.