Blog ·
Ketamine Therapy Side Effects: During the Session, After It, and Over Time
Quick Answer
The most common side effects of ketamine therapy happen during and shortly after a session — dissociation, dizziness, nausea, blurred vision, drowsiness, and a temporary rise in blood pressure and heart rate — and generally resolve before you leave the clinic. Less common risks, including effects on the bladder with frequent or prolonged use and the potential for misuse, are the reason ketamine for depression belongs in a monitored, physician-supervised setting. Ketamine is not FDA-approved for psychiatric conditions and is used off-label; every session at Denver Ketamine Clinic is supervised by a psychiatrist's team with vital signs monitored throughout.
During the session
Ketamine is a dissociative anesthetic, and at the low doses used for depression most people feel some of that: a sense of detachment from the body or surroundings, altered perception of time, floating or heaviness. Dizziness, nausea, and blurred or double vision are common. Blood pressure and heart rate usually rise during the session, which is why they are measured before, during, and after. These effects are expected, are the reason a session is monitored, and typically fade within an hour or two of the dose.
After the session
Drowsiness, unsteadiness, and difficulty concentrating can persist for several hours, which is why you cannot drive yourself home and should not drive until the next day. Headache, fatigue, and mild nausea are reported by some patients the same evening. Sleep that night may be lighter or heavier than usual.
With repeated use
Two risks change the calculus for anyone considering a long course or maintenance sessions. First, frequent ketamine exposure over time has been associated with bladder irritation and, in heavy or chronic use, more serious bladder damage; this is well documented in recreational use and is why a supervised program keeps dosing and frequency conservative and asks about urinary symptoms at every visit. Second, ketamine has a potential for misuse and dependence, which is why it is given only in the clinic, never prescribed to take home, and why a history of substance use disorder is a reason for caution or exclusion.
Who should not receive ketamine therapy
Uncontrolled high blood pressure, certain heart conditions, a history of psychosis, active substance use disorder, and pregnancy are among the situations that require careful review and may rule ketamine out. Your psychiatrist screens for these at the evaluation; the screening is not a formality.
What is monitored, and why that matters
Every session here is in a private room with vital signs tracked and staff present. A ride home is arranged before the first session, not after. Dosing, frequency, and the total number of sessions are individualized and reviewed as you go, and your psychiatrist decides whether the next session happens — not a protocol on a wall.
Ketamine vs. SPRAVATO® side effects
SPRAVATO® (esketamine) shares the same family of effects — sedation, dissociation, blood pressure changes — and carries a boxed warning and a restricted distribution program. The comparison that matters is approval and coverage, not a different side-effect profile: see SPRAVATO® vs. ketamine therapy and the SPRAVATO® Important Safety Information.
Frequently asked questions
Is the dissociation dangerous?
Dissociation is an expected effect of ketamine at these doses and is the reason sessions are monitored. It typically fades within an hour or two. It is managed in the clinic, and you do not leave until it has resolved enough to go home with your ride.
Can ketamine therapy damage my bladder?
Bladder irritation and, with heavy or chronic exposure, bladder damage have been reported, mainly in recreational use. A supervised program limits dose and frequency and screens for urinary symptoms at every visit to keep that risk low.
Will I remember the session?
Most patients remember it, often as dreamlike or detached. Memory of the session is not a measure of whether it helped.
Can I take my regular medications?
Usually, but some medications interact with ketamine or blunt its effects. Bring a full list to the evaluation; your psychiatrist tells you what, if anything, to adjust.
Questions about whether ketamine therapy is safe for you? That is what the evaluation is for.
Request a consultation