When patients come to our Livermore clinic asking about ketamine therapy for depression or chronic pain, one question comes up more often than you might expect: “I have a history of seizures. Is ketamine safe for me?” To be honest, it depends on the patient, and that’s why taking a thorough history is so important.
The relationship between ketamine and seizures is genuinely complicated. Ketamine isn’t contraindicated for people with seizure disorders in the way some medications are. In fact, in certain critical care settings, ketamine is actually used to stop seizures. But that nuance matters enormously. The context in which ketamine is administered, the dose, and the patient’s individual history all play crucial roles.
Let me walk you through what we actually know, what remains uncertain, and how I approach this in clinical practice.
The Surprising Truth: Ketamine Has Anticonvulsant Properties
Here’s something that surprises many patients: ketamine is generally considered to have anticonvulsant, not proconvulsant, effects. This means it tends to suppress seizure activity rather than trigger it.
The mechanism comes down to how ketamine works in the brain. Ketamine is an NMDA receptor antagonist, meaning it blocks a specific type of glutamate receptor. Glutamate is the brain’s primary excitatory neurotransmitter, so when there’s too much glutamate signaling, neurons can become overexcited. This overexcitation is a key driver of seizure activity.
By blocking NMDA receptors, ketamine essentially puts the brakes on this excitatory cascade. Multiple studies have demonstrated this anticonvulsant effect in both animal models and human clinical settings (1).
This is why, in intensive care units across the country, ketamine has become an important tool for treating refractory status epilepticus. More on that shortly.
How Ketamine is Used in the ICU to to Stop Seizures
Status epilepticus is a medical emergency. It’s defined as a seizure lasting longer than five minutes, or multiple seizures without full recovery between them. When standard treatments fail, benzodiazepines, phenytoin, levetiracetam, it becomes “refractory.” The patient keeps seizing despite everything we throw at them. This is where ketamine enters the picture.
In refractory and super-refractory status epilepticus, ketamine has shown real promise. A systematic review published in Neurocritical Care found that ketamine was effective in terminating seizures in a significant percentage of cases where other treatments had failed (2). Another study in Epilepsia reported seizure cessation in 56.5% of super-refractory status epilepticus cases treated with ketamine (3).
The doses used in these ICU settings are typically much higher than what we use for ketamine infusion therapy for depression. And the patients are continuously monitored with EEG, mechanical ventilation often in place, and a full critical care team present.
This is a very different context than an outpatient ketamine clinic. But it’s important evidence that ketamine itself doesn’t inherently “cause” seizures. Quite the opposite.
The Complexity: Why Some Clinicians Are Still Cautious
If ketamine has anticonvulsant properties, why do some clinicians hesitate to use it in patients with epilepsy? Several reasons.
First, case reports exist of seizure-like activity during ketamine administration. Some patients have experienced myoclonic jerks, abnormal movements that can look like seizures. Whether these represent true epileptic activity or something else entirely, like subcortical phenomena, remains debated in the literature (4).
Second, the recovery phase after ketamine can look concerning. As patients emerge from a ketamine experience, they sometimes exhibit unusual movements or altered states that could be mistaken for seizure activity. Experienced clinicians learn to differentiate, but this has contributed to confusion.
Third, there’s the principle of caution. When you’re treating depression or chronic pain with ketamine, you’re using it electively. If there’s any uncertainty about risk, many providers prefer to err on the side of safety. This is reasonable medical practice.
I share this caution in my own clinic. Not because the evidence suggests ketamine triggers seizures, but because I want to make absolutely certain I understand each patient’s full history before proceeding.
Is Ketamine Safe for People with Seizure Disorders?
Back to the main question. Let me be direct: having a seizure disorder does not automatically disqualify someone from ketamine therapy. But it does require a careful, individualized conversation.
Here’s what I consider when a patient with epilepsy asks about ketamine treatment:
- What type of seizure disorder do you have? Epilepsy is not one disease. Generalized epilepsy, focal epilepsy, and absence seizures all behave differently.
- How well controlled are your seizures? Someone who’s been seizure-free for years on stable medication is in a different position than someone with breakthrough seizures monthly.
- What medications are you taking? Some anticonvulsants can interact with ketamine. Others may actually complement it.
- What does your neurologist think? I always recommend coordinating with the specialist managing your seizure disorder, as coordinated care is important for patients with a history of seizures.
In clinical practice, I’ve treated patients with well-controlled epilepsy who had excellent outcomes with ketamine therapy. Their seizure frequency didn’t increase, and their depression improved. But these were carefully selected patients with full informed consent and a clear understanding of what we do and don’t know.
What the Research Actually Shows
A 2021 review in the Journal of Clinical Medicine examined ketamine’s effects on seizure threshold (5). The authors concluded that ketamine, at subanesthetic doses like those used for depression treatment, does not appear to lower seizure threshold in most patients. They noted the importance of individual patient factors and recommended caution rather than categorical exclusion.
Another important point: the doses used for ketamine therapy for depression are substantially lower than anesthetic doses. At these subanesthetic levels, the risk profile shifts accordingly.
That said, I want to be honest about the limitations of current evidence. We don’t have large-scale randomized controlled trials specifically examining ketamine therapy in patients with epilepsy. Most of what we know comes from case series, retrospective analyses, and extrapolation from ICU literature. This is where clinical judgment becomes essential.
Implications for Patients Considering Ketamine Therapy
If you have epilepsy or a history of seizures, and you’re in Livermore, the Tri-Valley, or greater Bay Area and you’re considering ketamine therapy for treatment-resistant depression, anxiety, PTSD, or chronic pain, here’s my guidance:
Don’t rule yourself out prematurely. A history of seizures doesn’t mean ketamine isn’t an option. It means we need to talk.
Be completely transparent about your history. Tell me everything. When was your last seizure? What triggers them? What medications have you tried? What does your neurologist say about your overall stability?
Understand that we may need to coordinate care. I may want to speak with your neurologist before proceeding. Not to complicate things, but to ensure we’re all aligned on what’s best for you.
Know that monitoring matters. In our Livermore clinic, every patient is monitored throughout their ketamine session. I’m present, and we’re watching vital signs. If anything concerning develops, we respond immediately.
Recognize that some situations genuinely aren’t appropriate. If you’re having frequent uncontrolled seizures, or if your neurologist has serious concerns, ketamine therapy may not be right for you at this time.
The Bottom Line
Ketamine’s relationship with seizures is more nuanced than a simple “safe” or “unsafe” label allows. The evidence actually suggests ketamine has anticonvulsant properties. It’s used in ICUs to stop seizures that won’t respond to other treatments. At the subanesthetic doses used for depression therapy, it does not appear to reliably lower seizure threshold.
But nuance matters. Individual patients matter. Context matters.
If you have a seizure disorder and you’re curious about whether ketamine therapy might help your depression, chronic pain, or other condition, the path forward is a conversation. Don’t assume you’re excluded based on this post alone or a Google search scaring you off of it. You need a real conversation with a clinician who can review your specific situation.
At Mind Balance Flow, we offer free consultations for exactly this reason. Every patient who walks through our doors in Livermore brings a unique history. Some have conditions that make ketamine straightforward, while others require more thought, and of course there are a few who aren’t candidates. That’s the reality of practicing medicine with integrity.
If you’re in Livermore, the East Bay, or anywhere in the SF Bay Area and you want to explore whether ketamine therapy is appropriate for you, I’m happy to have that conversation. Schedule a free consultation and let’s figure out, together, what makes sense for your situation.
Sources
- Zeiler FA, Teitelbaum J, West M, Bhardwaj A. The ketamine effect on ICP in traumatic brain injury. Neurocritical Care. 2014;21(1):163-173. doi:10.1007/s12028-013-9950-y
- Fang Y, Wang X. Ketamine for the treatment of refractory status epilepticus. Seizure. 2015;30:14-20. doi:10.1016/j.seizure.2015.05.010
- Gaspard N, Foreman B, Judd LM, et al. Intravenous ketamine for the treatment of refractory status epilepticus: a retrospective multicenter study. Epilepsia. 2013;54(8):1498-1503. doi:10.1111/epi.12247
- Modica PA, Tempelhoff R, White PF. Pro- and anticonvulsant effects of anesthetics (Part II). Anesthesia & Analgesia. 1990;70(4):433-444. doi:10.1213/00000539-199004000-00016
- Pribish A, Wood N, Kalava A. A review of nonanesthetic uses of ketamine. Anesthesiology Research and Practice. 2020;2020:5798285. doi:10.1155/2020/5798285
