Yes, cenobamate is a controlled substance. The DEA classified it as a Schedule V drug under the Controlled Substances Act, effective March 10, 2020. Schedule V is the lowest level of controlled substance scheduling, meaning cenobamate has a recognized but relatively low potential for abuse compared to drugs in higher schedules.
Cenobamate is sold under the brand name Xcopri and is prescribed for partial-onset seizures in adults. Understanding its controlled status matters because it affects how your prescription is written, filled, and refilled.
Why Cenobamate Is Classified as Schedule V
Cenobamate works through two mechanisms in the brain. It blocks a specific type of electrical signal (called persistent sodium currents) that can trigger seizure activity, while also boosting the calming effects of GABA, the brain’s main inhibitory chemical. That second mechanism, the GABA enhancement, is what gives cenobamate some potential for abuse and physical dependence. Other drugs that act on the GABA system, like benzodiazepines and some sleep medications, are also controlled substances, though most of those sit in higher schedules (III or IV).
Clinical studies in healthy volunteers confirmed that cenobamate can produce physical dependence. When the drug was abruptly stopped in these studies, participants experienced withdrawal symptoms including insomnia, decreased appetite, depressed mood, tremor, and memory difficulties. This withdrawal profile, combined with the drug’s effects on the brain’s calming pathways, led the DEA to place it in Schedule V rather than leaving it unscheduled.
What Schedule V Means for Your Prescription
Schedule V drugs carry fewer restrictions than higher-schedule medications. You won’t face the tight limits that come with Schedule II drugs like certain opioids or stimulants, where prescriptions can’t be refilled at all and require a new written order each time. Federal regulations allow Schedule V prescriptions to be partially filled, and dispensing can occur for up to six months after the prescription date.
In practice, you’ll still need a valid prescription from a licensed provider. Your pharmacy will track the dispensing as they do with all controlled substances. Some states impose additional rules on Schedule V drugs beyond the federal baseline, so your local experience may vary slightly. The main takeaway: getting cenobamate refilled is generally straightforward, but expect a bit more documentation than you’d see with a completely unscheduled medication.
Side Effects That Reflect Its CNS Activity
The same brain activity that earns cenobamate its controlled status also produces its most common side effects. In real-world clinical use, roughly half of patients experience at least one side effect. Drowsiness, dizziness, balance problems, and fatigue are the most frequent. These effects are consistent with a drug that calms overactive brain signaling, and they’re typically manageable. Many patients find that taking cenobamate in the evening reduces daytime drowsiness, and for others, the side effects fade on their own over time or improve with dose adjustments.
How Cenobamate Is Dosed
Cenobamate uses a slow, careful dose increase to minimize side effects and reduce the risk of a serious skin reaction that can occur with rapid escalation. You start at 12.5 mg once daily and increase every two weeks through a defined schedule: 25 mg, then 50 mg, then 100 mg, then 150 mg. By week 11, most patients reach the recommended maintenance dose of 200 mg once daily. If seizures aren’t adequately controlled at that level, your doctor can continue increasing by 50 mg every two weeks up to a maximum of 400 mg per day.
This slow titration means it takes at least 10 weeks to reach the standard maintenance dose. That timeline can feel long when you’re waiting for better seizure control, but the gradual approach is intentional and significantly improves tolerability.
Stopping Cenobamate Safely
Because cenobamate can cause physical dependence, stopping it abruptly is risky for two reasons. First, sudden withdrawal can trigger rebound seizures or even status epilepticus, a prolonged seizure that requires emergency treatment. Second, the withdrawal symptoms themselves (insomnia, mood changes, tremor, appetite loss, memory problems) can be unpleasant. The recommended approach is tapering the dose gradually over at least two weeks. Rapid discontinuation is only considered when a serious adverse event makes continued use dangerous.
This gradual withdrawal requirement applies to most anti-seizure medications, not just cenobamate. But the documented physical dependence profile reinforces why you should never stop this medication on your own without a plan from your prescriber.