Managing Ketamine Side Effects: What to Expect and How to Cope

Side Effects Are Normal — and Manageable

Starting ketamine therapy often comes with a natural concern about side effects. You may have read about dissociation, nausea, or dizziness and wondered how you will handle them. The reassuring truth is that most ketamine side effects are temporary, predictable, and manageable with the right preparation.

Understanding what you might experience — and having practical strategies ready — can transform side effects from a source of anxiety into a manageable part of your treatment journey. This guide walks you through the most common side effects of ketamine therapy and gives you concrete tools for coping with each one.

Dissociation

What It Feels Like

Dissociation is the most characteristic effect of ketamine. For a deeper look at the full experience, see our guide on what ketamine therapy feels like. You may feel a sense of detachment from your body, as though you are floating, watching yourself from a distance, or existing in a dreamlike state. Your sense of time may shift — minutes might feel like hours, or vice versa. Some people experience vivid imagery or a sensation of moving through space.

How to Manage It

• Expect it. Knowing that dissociation is a normal, expected part of the experience makes it far less unsettling. This is not a sign that something is wrong.
• Surrender rather than resist. Patients who try to fight the dissociative experience often find it more distressing. Allowing yourself to lean into the experience, with curiosity rather than fear, tends to produce a more comfortable and even meaningful session.
• Use grounding techniques if needed. If the experience feels overwhelming, focus on your breath. Slow, steady breathing can anchor you. You can also wiggle your fingers or toes to reconnect with your body.
• Choose comforting music. Many patients find that calming music — without lyrics — helps create a soothing backdrop for the dissociative experience. Some clinics provide playlists, or you can bring your own.
• Wear an eye mask. Reducing visual input can help you settle into the experience more comfortably and reduce overstimulation.

Dissociation typically resolves completely within one to two hours after the session ends. For most patients, it becomes more familiar and comfortable with each session.

Nausea

What It Feels Like

Nausea is one of the most common side effects, occurring in roughly 10 to 30 percent of patients. It may range from mild queasiness to a more pronounced feeling of an upset stomach. Actual vomiting is less common but can occur.

How to Manage It

• Fast before your session. Most providers recommend not eating for four to six hours before treatment. An empty stomach significantly reduces nausea risk.
• Stay hydrated. Drink water in the hours leading up to your session, but stop about an hour before to avoid a full stomach.
• Ask about anti-nausea medication. Your provider can prescribe ondansetron (Zofran) or another anti-nausea medication to take 30 to 60 minutes before your session. This is highly effective for most patients.
• Ginger. Ginger tea, ginger chews, or ginger supplements taken before the session can provide natural nausea relief.
• Minimize movement. Keeping your head relatively still during the session helps. Sudden position changes can worsen nausea.
• Breathe through it. Slow, deep breathing through the nose can help calm nausea. Some patients find that focusing on their breath serves a dual purpose — managing nausea and deepening relaxation.

If nausea has been a persistent issue across multiple sessions, talk to your provider about adjusting your protocol. Sometimes a slower infusion rate, a lower dose, or a change in preparation routine can make a significant difference.

Dizziness and Lightheadedness

What It Feels Like

You may feel dizzy, unsteady, or lightheaded during the session and for some time afterward. Standing up can feel wobbly, and your balance may be temporarily off.

How to Manage It

• Move slowly. When transitioning from lying down to sitting, take your time. Sit on the edge of the chair or bed for a minute before attempting to stand.
• Stay seated until you feel stable. There is no rush to get up after your session. Wait until the dizziness passes before trying to walk.
• Ask for assistance. If you need to use the restroom during or after a session, ask a staff member or your sitter for help. Falls can happen when people try to move too quickly while still feeling the effects.
• Stay hydrated. Dehydration can worsen dizziness. Drink water after your session once you feel ready.

Dizziness typically resolves within 30 minutes to an hour after the session. If it persists significantly longer, let your provider know.

Elevated Blood Pressure and Heart Rate

What Happens

Ketamine can temporarily increase blood pressure and heart rate. This is one of the reasons your vital signs are monitored during in-clinic sessions. For most patients, the increase is modest and resolves as the medication wears off.

How to Manage It

• Disclose your full medical history. Be upfront with your provider about any history of high blood pressure, heart conditions, or cardiovascular concerns. Review the full list of who should not take ketamine. This information is essential for safe treatment.
• Take your regular medications. If you are on blood pressure medication, take it as prescribed before your session unless your provider instructs otherwise.
• Monitor at home. If you are doing at-home ketamine therapy, your provider may ask you to check your blood pressure before and after sessions. Follow these instructions carefully.
• Stay calm. Anxiety before a session can contribute to elevated blood pressure. Deep breathing, relaxation exercises, or arriving early to settle in can help.

If your blood pressure rises significantly during treatment, your provider can adjust your protocol. In rare cases, medication may be given during the session to bring blood pressure down.

Drowsiness and Fatigue

What It Feels Like

Many patients feel tired, heavy, or mentally foggy after a ketamine session. This fatigue can last for several hours and sometimes lingers into the next day.

How to Manage It

• Plan for rest. Do not schedule demanding activities on treatment days. Give yourself permission to take it easy for the rest of the day.
• Arrange transportation. You will not be able to drive after your session. Having a ride arranged in advance removes a layer of stress.
• Nap if you need to. Many patients find that a nap after treatment is both restorative and natural.
• Avoid important decisions. Your judgment and cognitive function may be slightly impaired for the rest of the day. Hold off on work emails, financial decisions, or difficult conversations until the next day.

Emotional Sensitivity

What It Feels Like

Ketamine sessions can bring up unexpected emotions. You might feel tearful, tender, nostalgic, or emotionally raw after treatment. Some patients feel a wave of sadness before experiencing improvement, while others feel a rush of relief or gratitude.

How to Manage It

• Normalize it. Emotional processing is a healthy part of the therapeutic experience. These feelings are not a sign that the treatment is failing — they often indicate that meaningful psychological work is happening.
• Create a supportive environment. Have comforting items available for after your session — a favorite blanket, soothing music, a cup of tea.
• Journal. Writing about your emotions can help you process them rather than feeling overwhelmed by them.
• Talk to someone you trust. Whether it is a therapist, a partner, a friend, or a family member, sharing what you are feeling can lighten the emotional load.
• Be patient with yourself. Emotional sensitivity usually settles within a day or two. Give yourself grace during this time.

Visual and Perceptual Changes

What It Feels Like

During the session, you may notice blurred vision, heightened sensitivity to light, altered depth perception, or unusual visual patterns. These effects are temporary.

How to Manage It

• Keep the room dim. Soft or low lighting reduces visual discomfort.
• Use an eye mask. Blocking visual input entirely can make the experience more comfortable and less disorienting.
• Avoid screens afterward. Give your eyes a rest after the session. Reading, watching TV, or using your phone may feel uncomfortable for a while.

When to Contact Your Provider

While most side effects are expected and temporary, contact your provider if you experience:

• Persistent nausea or vomiting that does not resolve after the session
• Severe headache that does not respond to over-the-counter pain relief
• Blood pressure that remains elevated hours after treatment
• Prolonged confusion or disorientation lasting more than a few hours
• New or worsening mood symptoms between sessions
• Any symptom that feels concerning or unusual to you

You are never wrong to reach out. Your treatment team is there to support you, and no concern is too small to mention.

Side Effects Often Improve Over Time

Many patients find that side effects become milder and more predictable with subsequent sessions. Your body and mind adjust to the medication, and you develop your own coping strategies. What feels unfamiliar and potentially unsettling during your first session often becomes a manageable and even welcomed part of the treatment routine by your third or fourth visit.

References

• MedlinePlus: Ketamine Injection — National Library of Medicine drug information on ketamine, including side effects and precautions
• Mayo Clinic: Ketamine (Injection Route) — Mayo Clinic information on ketamine side effects, uses, and safety considerations
• NIMH: Depression Overview — National Institute of Mental Health guide to depression and treatment options