Yes, clobazam is a controlled substance. It is classified as a Schedule IV controlled substance by the U.S. Drug Enforcement Administration (DEA), assigned the controlled substance code number 2751. This places it in the same regulatory category as other benzodiazepines like diazepam and lorazepam, meaning it has a recognized medical use but also carries some potential for misuse and dependence.
What Schedule IV Means in Practice
The DEA uses a five-tier scheduling system, with Schedule I representing the highest restriction and Schedule V the lowest. Schedule IV drugs are considered to have a lower potential for abuse compared to Schedule III substances, but they still require a prescription and come with specific rules around how they can be dispensed.
Because clobazam sits in Schedule IV, federal law limits your prescription to a maximum of five refills. The prescription also expires six months after the date it was written, regardless of how many refills remain. After that point, your doctor needs to write a new prescription. Some states impose additional restrictions beyond these federal minimums, so your local rules may be tighter.
Why Clobazam Is Controlled
Clobazam belongs to the benzodiazepine class of medications. These drugs work by enhancing the activity of a calming chemical messenger in the brain, which is why they are effective at reducing seizures, anxiety, and muscle spasms. That same calming mechanism, however, is what gives benzodiazepines their potential for misuse. The relaxing or sedating effects can lead some people to take more than prescribed or use them without a medical need.
Clobazam is generally considered to have a milder sedation profile than many other benzodiazepines, which is one reason it landed in Schedule IV rather than a more restrictive category. Still, it shares enough pharmacological overlap with other drugs in this class that the DEA applies the same controlled substance designation.
What Clobazam Is Prescribed For
The FDA approved clobazam (sold under the brand name Onfi) specifically as an add-on treatment for seizures associated with Lennox-Gastaut syndrome, a severe form of childhood epilepsy. It is approved for patients 2 years of age and older. Clobazam is not typically used as the sole seizure medication; instead, it is added to an existing treatment plan when seizures are not adequately controlled.
Doctors sometimes prescribe clobazam off-label for other seizure disorders or anxiety conditions, though its FDA-approved indication is narrow compared to more widely used benzodiazepines.
Dependence and Withdrawal Risks
Like all benzodiazepines, clobazam can cause physical dependence with regular use over time. This means your body adjusts to the drug’s presence, and stopping suddenly can trigger withdrawal symptoms. In clinical trials, patients who abruptly discontinued clobazam experienced symptoms including headache, insomnia, anxiety, tremor, irritability, and in some cases, a return of seizures. The majority of these symptoms were classified as mild.
The good news is that gradual tapering appears to largely eliminate withdrawal problems. In the same clinical trial program, 87 patients who tapered off clobazam over a two- to three-week period reported no withdrawal-related side effects. Long-term studies following patients for up to five years on clobazam also did not observe withdrawal events during ongoing therapy. This is why doctors will always create a tapering schedule rather than have you stop the medication abruptly, especially if you have been taking it for weeks or months.
What This Means for Your Prescription
Having a Schedule IV medication does not make filling your prescription dramatically different from a standard one, but there are a few things to expect. Your pharmacist will log each dispensing in a controlled substance monitoring database, which most states maintain to track prescribing patterns. You will need a new prescription from your doctor at least every six months, and you cannot receive more than five refills on a single prescription.
If you travel domestically, carrying clobazam in its original labeled pharmacy bottle is generally sufficient. International travel is more complicated because benzodiazepine regulations vary widely by country. Some nations restrict importation of any controlled substance without advance documentation from their health authority. Checking the rules for your destination country well before your trip can prevent problems at customs.
Insurance coverage for clobazam can also be more involved than for non-controlled medications. Some plans require prior authorization, meaning your doctor must submit documentation explaining why the drug is medically necessary before your insurance will approve it. This is standard for many Schedule IV drugs and is not a reflection of anything unusual about your prescription.