Two epilepsy patients had dramatic seizure increases after stopping marijuana | Research

The takeaway

Two patients with focal epilepsy who were nearly seizure-free on regular marijuana use experienced dramatic seizure increases when they stopped, documented by video-EEG during hospital monitoring.

Read this if you have epilepsy and use cannabis for seizure control.

Dramatic seizure increase documented by video-EEG upon marijuana cessation

What the researchers found

Two patients with focal epilepsy had well-controlled seizures through regular outpatient marijuana use in addition to their anticonvulsant medications. When admitted to an epilepsy monitoring unit where they stopped marijuana, both developed dramatic increases in seizure frequency documented by video-EEG telemetry.

Importantly, these seizure increases occurred without any other provocative procedures: no medication changes, no sleep deprivation, no other typical seizure triggers. The temporal correlation between marijuana cessation and seizure increase was compelling.

The authors discussed potential anticonvulsant mechanisms of cannabis, noting that both CB1 receptor activation and CBD have shown anticonvulsant properties in animal models.

Why it matters

While anecdotal, these cases were rigorously documented with continuous EEG monitoring. They provided some of the most concrete clinical evidence that cannabis may have genuine anticonvulsant properties in humans, motivating the formal clinical trials of CBD for epilepsy that followed.

The numbers in context

Two patients with focal epilepsy. Both nearly seizure-free on marijuana. Dramatic seizure increase documented by video-EEG upon marijuana cessation. No other provocative factors.

How the study worked

Case report of two patients with focal epilepsy. Seizure frequency documented by continuous video-EEG monitoring during admission to epilepsy monitoring unit where marijuana use was discontinued. No other medications were changed or provocative procedures used.

What this study cannot tell us

Only two cases. Cannot prove marijuana was anticonvulsant versus that cessation was proconvulsant (rebound effect). Patients were using whole-plant cannabis, making it impossible to identify which component was responsible. No controlled comparison.

How to read the evidence

Case report of two patients. Rigorously documented with continuous EEG monitoring and absence of confounding factors. Compelling but very limited evidence.

When this study was published

Published in 2012. CBD (Epidiolex) was subsequently approved by the FDA for certain types of epilepsy in 2018, based on formal clinical trials.

The bigger picture

These cases contributed to the momentum that eventually led to clinical trials of CBD for epilepsy and the FDA approval of Epidiolex. While only two cases, the clear temporal relationship and continuous monitoring made them compelling.

Questions still open

Was the seizure increase from losing an anticonvulsant effect or from a rebound withdrawal phenomenon? Which cannabis component (THC, CBD, or combination) was responsible? Should epilepsy patients be warned about seizure risk when stopping cannabis?

Common questions

Can marijuana help control seizures?

These two case reports showed patients whose seizures were well-controlled with marijuana and worsened dramatically when they stopped. While only anecdotal, they were documented with continuous brain monitoring. CBD was later proven effective for certain epilepsy types in formal clinical trials.

Is it dangerous to stop marijuana if you have epilepsy?

These cases suggest stopping marijuana abruptly could increase seizure risk in some patients. If you have epilepsy and use cannabis for seizure control, any changes should be discussed with your neurologist and done gradually.

Read the original research

Seizure exacerbation in two patients with focal epilepsy following marijuana cessation.

Epilepsy & behavior : E&B, 25(4), 563-6

View on PubMed ↗Publisher’s paper ↗

Citation

Hegde, Manu; Santos-Sanchez, Carlos; Hess, Christopher P; Kabir, Arif A; Garcia, Paul A. (2012). Seizure exacerbation in two patients with focal epilepsy following marijuana cessation.. Epilepsy & behavior : E&B, 25(4), 563-6. https://doi.org/10.1016/j.yebeh.2012.09.024