Cannabis and Seizures: Evidence, CBD and Medical Cards
Cannabis and seizures have a real but narrow link. A purified prescription CBD medicine, Epidiolex, is FDA-approved for seizures in three rare epilepsy syndromes [1]. Evidence for the products you buy with a medical marijuana card is much thinner, so any plan is made together with your neurologist, never instead of your seizure medicines.
The short answer
Prescription CBD (Epidiolex). Proven in randomized trials for Dravet syndrome, Lennox-Gastaut syndrome and tuberous sclerosis complex; a doctor prescribes it, and no card is needed.
Dispensary cannabis products. Available with a medical card in many states, but their contents vary and they were never tested the way Epidiolex was.
Any form, any product. THC effects, drug interactions, drowsiness and driving rules apply whether you inhale, swallow or apply it, so the choice belongs in a conversation with your doctor.
Living with seizures when medicines aren’t enough
Many people reach seizure control with the first or second medicine they try. When two suitable seizure medicines, taken as prescribed, have not stopped the seizures, doctors call it drug-resistant (refractory) epilepsy [2]. That label is not a verdict. It is the point where specialists start looking at other options, from different medicines and diets to surgery and devices, and where many families first ask about cannabis.
Seizures keep coming
Even one breakthrough seizure a month can shape the whole calendar: plans get canceled, and someone always seems to be watching.
Side effects add up
Tiredness, slowed thinking and mood changes from seizure medicines are hard to separate from the seizures themselves. Both are worth raising with your doctor.
Driving and work
Most states require a seizure-free period before you can drive again [3], which can affect a job, a commute and independence.
Fear of a night seizure
Seizures during sleep are common, and worry about them keeps partners and parents up at night. Missed medicine doses and night seizures are both linked to higher risk [4].
Cannabis does not erase any of this. What it can offer is a specific, evidence-based conversation with a licensed physician: which cannabinoid, which product, how it fits with the medicines you already take, and what the research does and does not show. If you are the parent of a child with Dravet or Lennox-Gastaut syndrome, start by asking your child’s neurologist about Epidiolex, the prescription option studied in those syndromes.
What is a seizure? Types and categories
A seizure is a sudden burst of uncontrolled electrical activity in the brain. It can change movement, feeling, behavior or awareness for a few seconds to a few minutes [2]. Seizures are signs of something happening in the brain, not a disease on their own.
Epilepsy is different from a single seizure. Doctors diagnose it after two or more seizures that were not provoked by an obvious trigger, or after one seizure when tests show a high chance of more [2]. A seizure brought on by fever in a small child, very low blood sugar (hypoglycemia), low sodium or potassium, heavy drinking or alcohol withdrawal is an acute event: treat the cause and it may never return. Epilepsy is a chronic condition, though some childhood epilepsies fade with age and many adults become seizure-free on medicine.
Seizures are grouped by where they start in the brain and how they look. Choose a type to see what it means.
Focal seizures
- What it is
- A seizure that starts in one area or one side of the brain [5]. It may stay there or spread to both sides.
- What it can look like
- Twitching of one hand or one side of the face, a rising feeling in the stomach, a strange smell or taste, sudden fear, lip-smacking or fumbling with clothes.
- Awareness during it
- Some people stay fully aware; others look awake but do not respond and do not remember it afterward.
- Older names
- Simple partial and complex partial seizures.
Generalized tonic-clonic seizures
- What it is
- A seizure that involves both sides of the brain from the start [5], or spreads there from a focal start.
- What it can look like
- A cry or groan, falling, the body stiffening (tonic phase), then rhythmic jerking (clonic phase). Breathing can look labored, and the person may bite their tongue or lose bladder control.
- Awareness during it
- Lost. Afterward people are often confused, sore and very tired for hours.
- Older name
- Grand mal. This is the type people usually picture when they hear the word seizure.
Absence seizures
- What it is
- A short generalized seizure, most common in children [5]. The correct spelling is absence seizure, not absent seizure.
- What it can look like
- A blank stare for a few seconds, sometimes with fluttering eyelids. It can happen many times a day and is often mistaken for daydreaming, which is why some people call them quiet seizures.
- Awareness during it
- Briefly lost; the person picks up where they left off and may not know anything happened.
- Older name
- Petit mal.
Myoclonic and atonic seizures
- What it is
- Two kinds of very quick generalized seizures [5].
- What it can look like
- Myoclonic: sudden jerks of the arms or legs, like an electric shock. Atonic: muscles suddenly go limp, the head drops or the person falls, which is why they are also called drop seizures. Drop seizures are typical of Lennox-Gastaut syndrome.
- Awareness during it
- Usually too short to notice a change; falls can still cause injuries.
- Older name
- Drop attacks (atonic).
Unknown onset
- What it is
- A label doctors use when nobody saw how the seizure began, for example a seizure during sleep [5].
- What it can look like
- Anything above. A partner may only notice the jerking or find the person confused, with a bitten tongue or a wet bed.
- Awareness during it
- Often unknown, because the start was not witnessed.
- What helps
- A phone recording of an episode and a seizure diary help your neurologist reclassify it later.
How it’s diagnosed. A neurologist starts with a detailed description from you and anyone who saw the event. An EEG (electroencephalogram) records the brain’s electrical activity through small sensors on the scalp and can show patterns typical of epilepsy. An MRI scan takes detailed pictures of the brain to look for scars, malformations or tumors that can cause seizures. Blood tests look for provoked causes such as low blood sugar or low sodium [2].
Tic or seizure?
Tics and some seizures can look alike, especially in children. These differences are typical, not absolute, and a phone recording of an episode helps your doctor tell them apart.
More like a tic
- An urge builds up before it and eases after it.
- You can hold it back for a while.
- You stay aware and remember it.
More like a seizure
- No warning urge, or a short aura instead.
- It cannot be stopped once it starts.
- Awareness changes, followed by confusion or tiredness.
Could medical cannabis be part of your seizure care?
Answer a few questions about your seizures, your treatment and your health. You will get a plain-language summary of what applies to you and what to ask your doctor. It is not a diagnosis.
15 questions · about a minute · your answers stay in this browser
Can seizures cause brain damage?
Most short seizures do not cause lasting brain damage. Long seizures, or seizures that follow one another without recovery in between, can injure brain cells, which is why they are treated as emergencies [2]. A brain injury can also work the other way round and cause seizures.
Short seizures
A typical seizure lasting a minute or two usually leaves no measurable damage. Frequent seizures over many years can still affect memory and mood, one more reason to aim for good control.
Long seizures and status epilepticus
A seizure lasting more than five minutes, or repeated seizures without waking between them, is called status epilepticus. It needs emergency treatment because the risk of brain injury grows with time [6].
Head injury, stroke and surgery
Traumatic brain injury, stroke, brain infections and brain surgery are common causes of new seizures in adults. Seizures after a stroke are not unusual and should always be reported to the care team [2].
When is a seizure an emergency?
Most seizures end on their own and do not need an ambulance. Call 911 right away if any of these is true [6]:
It lasts longer than 5 minutes. Time it from the first sign. Five minutes feels much longer than it is.
Seizures come back to back. Another seizure starts soon after the first, or the person does not wake up or breathe normally in between.
It is the first seizure ever. A first seizure always needs a medical check to find the cause.
It happens in water. In a pool, lake or bathtub, even if the person seems fine afterward.
The person is hurt or struggling to breathe. A head injury, a fall from height or trouble breathing after the seizure.
The person is pregnant or has diabetes. Both change how a seizure affects the body and the baby.
While you wait: stay with the person, ease them to the floor, turn them onto one side, cushion the head, loosen anything tight around the neck and remove glasses. Never put anything in their mouth and do not hold them down [6].
Cannabis is not emergency care. No cannabis or CBD product stops a seizure in progress, and status epilepticus is treated in a hospital with emergency medicines [6].
How does cannabis act on seizure activity?
Your body makes its own cannabis-like messengers, called endocannabinoids. Together with the receptors they bind to, they form the endocannabinoid system, which works like a brake on nerve cells: when signaling gets too loud, it helps turn it down [7]. A seizure is, in simple terms, a moment when that balance fails and many neurons fire at once.
Plant cannabinoids reach into the same machinery, but not all in the same way. THC binds directly to the CB1 receptor, the main cannabinoid receptor in the brain. CBD barely touches it and works through a set of other targets instead [8].
- 1
Cannabinoid
CBD or THC from the plant, or your own endocannabinoids
- 2
Target in the brain
CB1 receptors for THC; ion channels and other receptors for CBD
- 3
Change in nerve signaling
Less overexcitement in some cases; with THC, sometimes the opposite
CBD and THC act on different targets, which is why results for one cannot be applied to the other.
Mechanisms of action: how CBD works
Scientists still do not know exactly how CBD reduces seizures. The best current answer is that it works on several targets at once, each nudging overactive neurons toward calm. Pick how much detail you want.
In short
CBD does not work like THC and does not switch on the brain’s main cannabinoid receptor. It seems to calm overexcited nerve cells through several routes at once: the channels that let sodium and calcium into neurons, a few receptors involved in excitability, and adenosine, the brain’s own calming signal. The mechanisms are not fully understood, and most of what we know comes from lab and animal studies [8].
In detail
GPR55 receptor
A receptor that makes neurons more excitable. CBD blocks it, which may restore some of the brain’s inhibitory tone.
Proposed, lab studies
TRPV1 channel
A channel that lets calcium into nerve cells. CBD acts on it and appears to make it less responsive over time [8].
Proposed, lab studies
Adenosine signaling
Adenosine slows neurons down. CBD may keep more of it around by slowing its uptake back into cells.
Proposed, lab studies
Sodium and calcium channels
These channels fire every nerve signal. CBD may reduce how easily they open, so bursts of firing are less likely.
Proposed, lab and animal studies
What does research say about CBD and seizures?
The strongest evidence belongs to one product. In 2018 the FDA approved Epidiolex, a purified CBD oral solution, for seizures linked to Lennox-Gastaut syndrome and Dravet syndrome [1], and in 2020 it added seizures linked to tuberous sclerosis complex [10]. The same year, the DEA removed approved CBD medicines from the federal list of controlled substances [11]. These are severe epilepsies that usually begin in childhood and rarely respond fully to standard medicines.
The trials behind that approval tested CBD as an add-on to existing seizure medicines, not as a replacement, at doses up to 20 mg/kg a day in Dravet and Lennox-Gastaut syndromes [12]. Evidence gets weaker as you move away from that setting, as the ladder below shows.
| Product | Randomized trials | Observational studies | Patient reports |
|---|---|---|---|
| Prescription CBD (Epidiolex) | Yes, for Dravet, Lennox-Gastaut and TSC | Yes, including other epilepsy types | Many |
| Dispensary CBD products | None comparable | Limited | Mostly |
| THC-containing products | None for seizures | Limited and mixed | Mostly, both better and worse |
Outside these syndromes the picture is less clear. Epidiolex has been used for other epilepsies, but the consensus of epilepsy experts is that its effect on focal seizures is not well defined [14]. For dispensary products there are no trials of the same quality at all.
→ Living with epilepsy long-term: medical cannabis and epilepsy management
Epidiolex vs CBD from a dispensary: not the same thing
This is the most common mix-up we hear. Both contain CBD, but one is a tested medicine with a fixed dose, and the other is a product whose contents depend on the brand, the batch and your state’s testing rules.
| Aspect | Epidiolex | Dispensary CBD |
|---|---|---|
| Legal status | FDA-approved prescription drug [1]; no longer a federally controlled substance [11] | Sold under your state’s medical or adult-use cannabis law [15] |
| What’s inside | Purified CBD in an oral solution with a fixed, labeled strength [10] | CBD, THC or both, plus other plant compounds; strength can vary from batch to batch |
| Quality control | Federal drug manufacturing standards | State lab testing; a certificate of analysis (COA) shows what a batch contains |
| Evidence | Randomized trials in Dravet, Lennox-Gastaut and TSC [13] | No trials of comparable quality |
| How you get it | Prescription from your doctor, usually through a specialty pharmacy | A licensed dispensary in your state |
| Medical card needed? | No | Yes in medical-only states; adult-use states also sell to adults without one |
Results from Epidiolex trials do not carry over to dispensary CBD: epilepsy experts specifically advise telling the prescription medicine apart from unregulated commercial CBD products [14]. A dispensary oil with the same milligrams on the label is not the same treatment.
Already on Epidiolex? → See which path fits you
What about THC?
THC is the part of cannabis that causes a high, and its relationship with seizures is the least settled part of this story. In animal studies THC has calmed some kinds of seizures and worsened others. In people, there are no good trials of THC for epilepsy, and case reports describe seizures both easing and getting worse.
What is clear is that the two compounds are not interchangeable. Purified CBD is approved for Dravet and Lennox-Gastaut syndromes as an option that does not cause a high, while products that combine several cannabinoids, including THC, are used for other conditions such as muscle stiffness in multiple sclerosis [8]. A finding about THC says nothing about a CBD-only product, and the reverse is also true.
That makes composition its own question, separate from the form you use. Check the label of your product and pick the matching profile.
CBD only
What is known with seizures
The only composition with randomized-trial evidence, and only in its prescription form [13]. Dispensary CBD-only products may still contain traces of THC unless a certificate of analysis shows otherwise. CBD interacts with clobazam, valproate and other medicines whatever the source.
Balanced THC:CBD
What is known with seizures
Roughly equal amounts of both. There are no seizure trials of balanced products. You get the effects of THC (intoxication, drowsiness, slower reactions) together with CBD’s drug interactions, so both sets of cautions apply.
THC-dominant
What is known with seizures
Most products sold for adult use fall here. There is no seizure evidence in their favor, and reports link high-THC use to seizures in some people, especially with other risk factors. Driving after THC is illegal in every state.
Can CBD or cannabis make seizures worse?
Yes, in some situations. Prescription CBD did not make seizures worse on average in trials, but cannabis use around epilepsy has several real ways to backfire. Most of them have nothing to do with CBD itself.
Other cannabinoids and emerging therapies
CBD and THC are only two of more than a hundred compounds in the cannabis plant. A few of the others are being studied for seizures, but none has reached the point where a doctor could recommend it for epilepsy.
Experimental
CBDV (cannabidivarin)
A close relative of CBD. It reduced seizures in animal models, and small human studies have been run; there is no approved CBDV medicine.
Experimental
THCV (tetrahydrocannabivarin)
Related to THC but acts differently at the CB1 receptor. Its anti-seizure effects have been seen only in animal studies so far.
Experimental
CBG (cannabigerol)
Sold widely as a supplement. Research on seizures is at an early lab stage, and products are not standardized.
Beyond the plant, researchers are testing synthetic cannabinoid-like molecules and, for Dravet syndrome, therapies aimed at the faulty SCN1A gene behind most cases, such as antisense medicines that boost the healthy copy of the gene. These are investigational. You can see which trials are recruiting, and where, on ClinicalTrials.gov [18].
Forms of cannabis and what each means with seizures
Cannabis is not only something people smoke. Medical patients also vape, swallow, hold under the tongue or apply it to the skin, and the form changes what reaches your lungs, your liver and your bloodstream. Choose a form to see what it avoids and what still applies.
Smoking: joints, blunts, pipes, bongs
What this form avoids
The slow, unpredictable start of edibles: effects begin within minutes and fade within a few hours.
What still applies
Smoke is a product of burning plant material and irritates the lungs. Most smoked flower is THC-dominant, and it is hard to know how much you took.
Vaping and dabbing: dry-herb vaporizers, oil cartridges and pens, concentrates
What this form avoids
Burning. A vaporized dose is absorbed better than a swallowed one, about 31% of CBD versus about 6% from oil capsules [8].
What still applies
The hot aerosol still passes through your airways. Concentrates such as wax, shatter and rosin can be very high in THC, and untested cartridges may contain additives.
Edibles and capsules: gummies, chocolate, baked goods, drinks, oils swallowed
What this form avoids
Smoke and hot vapor in the lungs. Capsules give a more consistent dose than most other forms.
What still applies
Effects start late and last longer. Taking a second portion because the first “didn’t work” is a common cause of taking too much. Everything you swallow passes through the liver first, where CBD and THC meet your seizure medicines.
Under the tongue: tinctures, oils, oral sprays
What this form avoids
Smoke and vapor. A dropper makes small, measured doses easier than with flower.
What still applies
Much of a tincture is swallowed anyway and goes through the liver. Drug interactions, drowsiness and the effects of any THC are the same as with other forms.
On the skin: creams, balms, transdermal patches
What this form avoids
Creams and balms act locally and put very little into the bloodstream. A transdermal CBD gel has been tested in a trial in adults with focal epilepsy.
What still applies
A local cream is not a seizure treatment. Patches are built to deliver into the blood, so their interactions and side effects are the same as with swallowed forms.
Suppositories
What this form avoids
Smoke, vapor and swallowing, which matters for someone who cannot take anything by mouth.
What still applies
Rarely used and barely studied for seizures. How much is absorbed is uncertain, and interactions and drowsiness still apply.
Prescription medicines: Epidiolex, dronabinol, nabilone
What this form avoids
Guesswork about contents. These are FDA-approved drugs with fixed doses [19]. They are prescribed by a doctor, not bought with a medical card.
What still applies
Only Epidiolex is approved for seizures. Dronabinol and nabilone are synthetic THC medicines for nausea and appetite, not for epilepsy.
Applies to every form
- THC acts the same way once it is in your blood, however it got there.
- Interactions with seizure medicines such as clobazam and valproate do not depend on the form.
- Drowsiness adds up with the sedating effects of many seizure medicines.
- Driving after THC is illegal, and seizure-related driving rules apply on top of that [3].
No form is a safe replacement for another, and this page does not rank them. Which form, if any, makes sense for you is a question for the doctor who knows your medicines.
How CBD doses were set in studies
This is what trials and experts used for prescription CBD, not a dose for you.
Prescription CBD is dosed by body weight, in milligrams per kilogram (mg/kg). Doctors start low and raise the dose step by step while watching seizures, side effects and blood tests. The figures below come from an expert consensus on Epidiolex.
A faster climb brings more side effects, which is why the schedule belongs to your prescriber. Dispensary products are not labeled in mg/kg, often contain THC and are absorbed differently, so these numbers cannot be converted into a dispensary dose.
Whatever you add, do not change or stop your seizure medicines on your own. If cannabis seems to help, the doctor may adjust them later, slowly and with monitoring.
Safety, side effects and drug interactions
CBD is often described as gentle, and for many people it is. In the trials, though, side effects were common: about 90% of people taking 20 mg/kg/day reported at least one, compared with 72% on placebo [12]. Most were mild to moderate. The ones to watch for:
- Sleepiness (somnolence), especially alongside clobazam
- Lower appetite and weight loss
- Diarrhea
- Raised liver enzymes (transaminases) on blood tests [12]
Liver checks on prescription CBD
Experts recommend liver blood tests (AST, ALT and bilirubin) at these points, then periodically [14]:
- Before starting
- 1 month
- 3 months
- 6 months
Medicines that interact with CBD
CBD is broken down by the same liver enzymes (the CYP450 family) that handle many seizure medicines, so each can change the level of the other [12]. Open a card to see what happens and what to ask.
ClobazamCBD raises the level of clobazam’s active breakdown product.
The usual result is more sleepiness. Epilepsy experts advise caution with this combination and closer follow-up [14]; sometimes the clobazam dose is lowered rather than CBD stopped.
Ask: Should my clobazam dose change if I start CBD? What sleepiness is a reason to call you?
ValproateThe combination is the main reason liver enzymes rise.
Liver tests are especially important early on when CBD is added to valproate [13].
Ask: How often will you check my liver? Which symptoms, such as yellow skin or dark urine, mean I should call right away?
Other drugs broken down by liver enzymes (CYP450)Levels of many medicines can shift up or down.
This includes several seizure medicines and drugs for other conditions. Interactions also involve a second enzyme system called UGT [14].
Ask: Please review my full medicine list, including supplements, before I start anything with CBD.
Sedating medicinesSleep aids, anxiety medicines, opioids and antihistamines.
Drowsiness from each adds up, and THC adds more [14].
Ask: Which of my medicines make me drowsy, and is it safe to combine them with CBD or THC?
mTOR inhibitors (everolimus)Often used in tuberous sclerosis complex.
Epilepsy experts list mTOR inhibitors among the medicines that need caution with CBD [14], so everolimus blood levels are often checked more closely.
Ask: Do we need extra everolimus blood tests after I start CBD?
AlcoholMore drowsiness, and its own seizure risk.
Alcohol adds to the sedation of both CBD and THC, and heavy drinking or sudden withdrawal can trigger seizures by itself [17].
Ask: Is any amount of alcohol reasonable with my medicines?
Does cannabis affect memory?
THC can, CBD is not known to, and epilepsy itself often does. Memory complaints in people with seizures usually have several causes at once, so it helps to separate them. Pick what applies to you.
THC
THC affects short-term memory and attention while it is active, and frequent heavy use is linked to lasting problems with memory, especially when use starts in the teens [7]. Effects are dose-related: more THC, more often, means more impact.
CBD
CBD does not cause intoxication and is not known to impair memory the way THC does. In lab work it even reversed a memory-related deficit in brain tissue [8], but that is far from proof of a benefit in people. Its sleepiness can still make you feel foggy.
Seizures and seizure medicines
Seizures that start in the temporal lobe, where memories are formed, often affect memory. Frequent seizures, the brain changes that cause them, and some seizure medicines can all slow thinking [17]. Brain injury and PTSD affect memory too, so people with both may notice it more. Tell your doctor about any change: it can sometimes be fixed by adjusting treatment.
Tired after a seizure
Yes, seizures make you tired. After a seizure, especially a tonic-clonic one, many people feel exhausted, confused and forgetful for hours, sometimes a day or more. This recovery phase is normal; the memory of the seizure itself is often missing. Confusion that keeps getting worse needs medical attention.
→ Memory and trauma: cannabis and PTSD
What science doesn’t know yet
Being honest about the gaps matters as much as the results. These are the questions research has not answered.
Whether THC helps or harms seizures
There are no good human trials. Lab results point both ways, and individual reports cannot settle it.
What is really in dispensary products
Labels, testing rules and accuracy vary by state and brand, so no study result applies to every bottle.
Whether results transfer to other epilepsies
The strong evidence comes mostly from children with three rare syndromes; trials did not test CBD without other seizure medicines [12].
Long-term safety
The randomized trials lasted no longer than 14 weeks, and long-term safety data in children are lacking [12].
Summary: key evidence and considerations
If you read only one part of this page, read this one. Each card is one layer of the answer.
Prescription CBD
Epidiolex reduces seizures for some people with Dravet, Lennox-Gastaut and TSC when added to other medicines. It needs liver checks and a prescription, not a card.
Dispensary products
Legal with a medical card in many states, but untested for seizures in the way Epidiolex was. A lab certificate (COA) shows what you are actually buying.
THC
The least understood part. It may help some people and worsen seizures in others, and it impairs driving and short-term memory.
Safety
Sleepiness, appetite and liver changes are the common issues; clobazam and valproate need extra care. Never stop seizure medicines on your own.
What your doctor decides at the appointment: whether your diagnosis qualifies under your state’s program, whether cannabis makes sense alongside your current medicines, and which composition to avoid or discuss with your neurologist.
Which path fits you?
People land on this page from very different places. Pick the one closest to yours.
This is my first card
Bring what you know about your seizures: diagnosis, medicines and how often seizures happen. The doctor checks whether epilepsy or seizures qualify in your state and talks through what cannabis can and cannot do alongside your treatment. Your neurologist stays in charge of your seizure medicines.
I already take Epidiolex
You do not need a medical card for Epidiolex: it is a prescription medicine filled at a pharmacy. A card only matters if you and your doctors are considering dispensary products in addition to it, and that combination needs a careful conversation about interactions and THC. See how the two differ.
I’m renewing my card
Start before your card expires so there is no gap. At the renewal appointment, give the doctor your current list of seizure medicines and any changes since last year. Choose your state:
I’m moving to another state
A medical card is issued under one state’s law. A few states honor out-of-state cards, many do not, so plan for a new card in your new home state. Read how traveling with medical marijuana works across state lines, and never carry cannabis across them.
Is epilepsy a qualifying condition for a medical marijuana card?
In most state medical programs, yes: epilepsy, seizures or seizure disorders appear on nearly every list of qualifying conditions, though the wording differs. Some states write “epilepsy”, others “seizures” or “intractable epilepsy”, and a handful run CBD-only or low-THC programs instead of full medical cannabis [15]. The list changes over time, so check your state’s current rules on our state laws and regulations page, or browse all qualifying conditions.
A physician licensed in your state makes the final call at the appointment, based on your history. You can read how an online medical card evaluation works before you book.
Related conditions
Medical marijuana in your state
Every program is run by a state agency, usually the health department or a cannabis control board. It keeps the patient registry, issues the card after your doctor’s recommendation and licenses the dispensaries where patients buy. Possession limits, taxes, home cultivation and whether minors can register all differ by state [15], and the details for yours are on its laws and regulations page.
Medical card or adult-use cannabis?
In states that also allow adult-use (recreational) sales, you could skip the card. For someone with seizures, the card brings a few things a store shelf does not. Exact rules vary by state.
With a medical card
Without (adult-use)
Medical guidance
A licensed physician reviews your seizure medicines before recommending cannabis
You choose on your own, often with advice from store staff
Products
Medical product lines, including low-THC and CBD-rich options, with lab certificates (COA)
Adult-use shelves, weighted toward high-THC products
Taxes
Lower or fewer cannabis taxes in many states (how it works)
Full adult-use taxes
Limits and age
Often higher possession limits; adults 18 to 20 can qualify in many states
Standard limits, 21 and older only
In medical-only states the card is simply the only legal way to buy. More on the difference between medical and recreational cannabis.
Legal protections: firearms, work, privacy and driving
A medical card makes cannabis legal under state law, not under federal law. That gap matters most in these five areas.
Firearms
Buying a gun from a licensed dealer means filling out federal Form 4473, which asks whether you use marijuana and warns that state legalization does not change federal law [21]. Holding a medical card can therefore affect gun ownership. Read the current form and get legal advice before you apply.
Work and drug tests
Some states protect registered patients from being fired for having a card; others do not, and federal jobs and safety-sensitive roles follow federal rules. Epilepsy itself is covered by the Americans with Disabilities Act, which can entitle you to reasonable accommodations [22]. Prescription Epidiolex contains no meaningful THC, while dispensary products can make you fail a drug test.
Privacy
Your medical records are protected by HIPAA, the federal health privacy law [23]. State patient registries are confidential and are generally open only to the agency, law enforcement verifying a card and, in some states, a caregiver registered under state law. Employers and landlords cannot look you up in them.
Driving
Two separate rules apply. First, most states set a seizure-free period before someone with epilepsy may drive, often three months to a year, usually with a doctor’s statement; a few leave it to the licensing agency case by case [3]. Second, driving under the influence of THC is illegal everywhere, card or not.
Disability
Epilepsy is listed in the Social Security Administration’s Blue Book (section 11.02). People whose seizures continue despite following prescribed treatment may qualify for disability benefits, based on how often seizures happen and how they limit daily life [24].
Frequently asked questions about cannabis and seizures
Can seizures be hereditary or genetic?
Sometimes. Some epilepsies are caused by a single gene change, such as SCN1A in most cases of Dravet syndrome, and others run in families more loosely. Many people with epilepsy have no relative with it, and their seizures come from injury, stroke, infection or an unknown cause [2]. A neurologist may suggest genetic testing, especially when seizures start in childhood.
Can seizures be caused by stress?
Stress does not cause epilepsy, but it is one of the triggers people with epilepsy report most often, along with poor sleep and missed medicine. Separately, some seizure-like episodes come from stress and emotional strain rather than abnormal electrical activity. They are called functional or psychogenic non-epileptic seizures (part of FND), are diagnosed with EEG monitoring and are treated differently.
Why do seizures happen at night or during sleep?
Brain activity changes between sleep stages, and some epilepsies produce seizures mainly then. Lack of sleep also lowers the seizure threshold. Night seizures can go unnoticed, so signs like a bitten tongue, a wet bed or sore muscles in the morning are worth reporting. Unwitnessed night seizures are linked to higher risk, which is one reason to aim for full control [4].
Is it dangerous for a fever to cause seizures?
Febrile seizures in young children are frightening but usually harmless, and most children never develop epilepsy. Have every first febrile seizure checked by a doctor. Call 911 if it lasts longer than five minutes or another follows soon after [6]. In adults, fever with a seizure needs urgent evaluation for infection. See when a seizure is an emergency.
Can seizures be fatal?
Rarely, but it is possible, and it is right to know. The risks are long seizures (status epilepticus), injuries and drowning during a seizure, and sudden unexpected death in epilepsy (SUDEP). Taking seizure medicine exactly as prescribed is the most important step to lower the risk of SUDEP [4]. Talk to your neurologist about your own risk and about night monitoring.
Do seizures ever go away? Can epilepsy be cured?
For many people, yes, in practice. Some childhood epilepsies fade with age, many adults become seizure-free on medicine, and surgery can stop seizures for carefully selected patients [2]. Doctors may try tapering medicine after a long seizure-free period, always slowly and under supervision. No cannabis product is a cure.
Can dehydration or low blood sugar cause seizures?
Yes. Severe dehydration, very low blood sugar (hypoglycemia) and low sodium or potassium can each provoke a seizure, even in someone without epilepsy. These are acute seizures: correcting the cause usually stops them. A person with diabetes who loses consciousness during a seizure needs 911 [6].
Can alcohol or alcohol withdrawal cause seizures?
Yes. Heavy drinking and, even more, stopping suddenly after a long period of heavy drinking can trigger seizures, usually within a day or two of the last drink. Alcohol also interacts with seizure medicines and adds to the drowsiness of CBD and THC [17]. Anyone who drinks heavily should stop with medical help, not alone.
Do seizures cause headaches?
Often. A headache after a seizure, along with tiredness and muscle soreness, is a common part of recovery. Migraine is also more common in people with epilepsy. A sudden severe headache, or one with new weakness or confusion, needs urgent medical care.
If I have seizures, can I get disability?
Possibly. The Social Security Administration lists epilepsy among the conditions that can qualify when seizures continue despite following prescribed treatment [24]. See the disability section above.
Is CBD oil from a store the same as Epidiolex?
No. Epidiolex is purified CBD made to drug standards and tested in randomized trials. Store or dispensary oils vary in strength and may contain THC, and the trial results do not apply to them [14]. See Epidiolex vs CBD from a dispensary.
Is delta-8 THC safe if I have epilepsy?
It has not been studied for seizures. Delta-8 is an intoxicating cannabinoid usually made chemically from hemp CBD, and the FDA has warned about poor manufacturing controls and adverse event reports [16]. It carries the same cautions as THC, with less certainty about what the product contains.
Will CBD interfere with my seizure medicines?
It can. CBD shares liver enzymes with many seizure medicines. With clobazam it often increases sleepiness, and with valproate it raises the chance of liver enzyme changes [12]. Your doctor may adjust doses and order blood tests. See drug interactions.
Can cannabis cause seizures?
It can in some people, mainly with high-THC products, synthetic cannabinoids or mixed substances. Purified CBD has not shown this effect on average in trials. See can cannabis make seizures worse.
Do I need a medical card to get Epidiolex?
No. Epidiolex is an FDA-approved prescription medicine [1], prescribed by your doctor and filled at a pharmacy like any other drug. A medical card is only for buying cannabis products at state-licensed dispensaries.
Is an online medical marijuana evaluation legal?
Yes, in states that allow telemedicine for medical cannabis certifications, which most programs do. The appointment is with a physician licensed in your state, and the recommendation is the same one you would receive in an office. Read how the online evaluation works.
Where can I buy once I have a card?
At dispensaries licensed by your state’s medical program. Many have pharmacists or trained staff and carry lab certificates for each product. Ask for the COA, and bring your doctor’s guidance about composition.
Can I use my medical card in another state?
Only where the other state accepts out-of-state cards, called reciprocity, and rules differ widely. Carrying cannabis across state lines is illegal under federal law. Read our guide to traveling with medical marijuana.
What should I do if I lose my medical card?
Most states let you request a replacement through the same registry where you applied, sometimes for a small fee. Here is what to do if your card is lost.
→ More answers: medical card FAQ
More research on cannabis and seizures
This page cites a selection of studies. Our research library holds every study we track on cannabis and seizures, from laboratory work to clinical trials, and lets you filter them by cannabinoid, study type and year.
- studies
- 680+
- in people
- 250+
- clinical trials
- 52
How to get a medical marijuana card for seizures
Everything up to the state registration happens online, and you never need to visit a clinic. Here is the path, step by step.
Fill out a short form
Your state, basic details and a few questions about your seizures and medicines.
Appointment with a physician licensed in your state
You agree on the time with the doctor; keep the hour around it free in case the doctor runs late. You talk through your history, medicines and questions one on one.
Get your recommendation
If you qualify, the signed recommendation usually arrives within 24 to 48 hours after the appointment.
Register with your state
Most states require you to register with their program, and some charge a state fee. Review times are set by the state agency, not by us [15].
Visit a licensed dispensary
Show your card, ask for lab certificates and choose products in line with your doctor’s advice.
What to bring to the appointment
- Notes or records from your neurologist with your diagnosis
- A list of every medicine and supplement you take, with doses
- A seizure diary: how often, what type, and any recent changes
What happens after you book
- You get a confirmation with what to prepare and how to join.
- You and the doctor settle on an appointment time that works for both of you.
- At the appointment, the doctor reviews your history and decides whether you qualify under your state’s rules.
- If you qualify, your recommendation follows, usually within 24 to 48 hours, together with instructions for your state’s registration.
- If you do not qualify, you are told why, so you know your options.
Across 250 reviews from patients in the states where we are licensed. We do not sort them by score and do not hide the low ones.
- 150,000+patients evaluated – everyone who has been through an appointment with us, in every state where we are licensed
- Since 2017doing only this: online evaluations for medical cannabis programs, and nothing else on the side
Talk to a licensed doctor about cannabis and seizures
Bring your questions, your medicine list and your doubts. The doctor will tell you honestly whether a medical card makes sense for you, and what to discuss with your neurologist.
- 100% online
- Private
- Physician licensed in your state
Questions first? → Read the medical card FAQ
References
24 sources
- 1. U.S. Food and Drug Administration. FDA approves first drug comprised of an active ingredient derived from marijuana to treat rare, severe forms of epilepsy. 2018.
- 2. National Institute of Neurological Disorders and Stroke. Epilepsy and seizures. 2024.
- 3. Epilepsy Foundation. Driving laws by state. 2024.
- 4. Centers for Disease Control and Prevention. Sudden unexpected death in epilepsy (SUDEP). 2024.
- 5. Centers for Disease Control and Prevention. Types of seizures. 2024.
- 6. Centers for Disease Control and Prevention. First aid for seizures. 2024.
- 7. National Center for Complementary and Integrative Health. Cannabis (marijuana) and cannabinoids: what you need to know. 2024.
- 8. Cannabidiol in Neurological and Neoplastic Diseases: Latest Developments on the Molecular Mechanism of Action. DOI: 10.3390/ijms22094294 PMID: 33919010
- 9. The DEC2-SCN2A Axis is Essential for the Anticonvulsant Effects of Cannabidiol by Modulating Neuronal Plasticity. DOI: 10.1002/advs.202416315 PMID: 40641288
- 10. U.S. Food and Drug Administration. EPIDIOLEX (cannabidiol) oral solution: prescribing information. 2025.
- 11. Drug Enforcement Administration, Federal Register. Implementation of the Agriculture Improvement Act of 2018. 2020.
- 12. The Interplay between the Endocannabinoid System, Epilepsy and Cannabinoids. DOI: 10.3390/ijms20236079 PMID: 31810321
- 13. Use of cannabidiol in the treatment of epilepsy: Lennox-Gastaut syndrome, Dravet syndrome, and tuberous sclerosis complex. DOI: 10.1590/1806-9282.2022D689 PMID: 36417631
- 14. Consensus panel recommendations for the optimization of EPIDIOLEX® treatment for seizures associated with Lennox-Gastaut syndrome, Dravet syndrome, and tuberous sclerosis complex. DOI: 10.1002/epi4.12956 PMID: 39007525
- 15. National Conference of State Legislatures. State medical cannabis laws. 2025.
- 16. U.S. Food and Drug Administration. 5 things to know about delta-8 tetrahydrocannabinol. 2022.
- 17. Centers for Disease Control and Prevention. Epilepsy: health and safety concerns. 2024.
- 18. U.S. National Library of Medicine. ClinicalTrials.gov. 2026.
- 19. U.S. Food and Drug Administration. FDA and cannabis: research and drug approval process. 2024.
- 20. U.S. Food and Drug Administration. What you should know about using cannabis, including CBD, when pregnant or breastfeeding. 2019.
- 21. Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Form 4473: Firearms transaction record. 2023.
- 22. U.S. Equal Employment Opportunity Commission. Epilepsy in the workplace and the ADA. 2021.
- 23. U.S. Department of Health and Human Services. Your rights under HIPAA. 2024.
- 24. Social Security Administration. Disability evaluation under Social Security: 11.00 Neurological disorders, adult. 2024.