AuthorisedTherapeutic confirmatory (Phase III)Interventional

Multicenter, Randomized, Double-blind, Placebo-controlled Trial of Clemizole HCl as Adjunctive Therapy in Patients with Lennox-Gastaut Syndrome

This study is investigating a new medicine called Clemizole HCl for people living in the UK with Lennox-Gastaut Syndrome, a serious form of epilepsy where seizures are difficult to control. Researchers want to find out if adding Clemizole HCl to a person's existing epilepsy medication can help reduce how often and how severe their seizures are. The study is a "Phase III" trial, which means it's one of the final steps to see if the medicine is safe and effective before it could be considered for wider use. Some participants will receive the new medicine, and others will receive a placebo (dummy pill) to compare the effects fairly.

At a glance

Status

Authorised

Phase

Therapeutic confirmatory (Phase III)

Sponsor

Epygenix Therapeutics Inc.

Enrolment target

Start

28 Apr 2026

Lennox-Gastaut Syndrome

What is this study about?

This clinical trial is designed to see if a new medicine, called Clemizole HCl, can help people who have a severe type of epilepsy known as Lennox-Gastaut Syndrome (LGS). LGS often causes many different kinds of seizures that are hard to get under control with standard treatments. The goal of this study is to find out if adding Clemizole HCl to a person's current epilepsy medication can help reduce the number and severity of these seizures.

The study is set up so that some people will receive the new medicine, while others will receive a 'placebo', which looks like the medicine but contains no active ingredients. This is a common and important way to fairly test if a new medicine works better than no treatment at all, or if any changes are just due to other factors. Neither the patients nor their doctors will know who is getting the real medicine and who is getting the placebo, which makes the results more reliable.

Throughout the study, doctors and researchers will carefully track participants' seizures and their overall well-being. They will measure how much the number of seizures changes, how many seizure-free days a person has, and how their daily life is affected. This will help them understand if Clemizole HCl makes a real difference for people with Lennox-Gastaut Syndrome.

Key takeaways

This study tests a new medicine for severe epilepsy (Lennox-Gastaut Syndrome).
It aims to see if the medicine reduces seizure frequency.
Participants will receive either the new medicine or a dummy pill (placebo).
You will be closely monitored for health changes and side effects.
The study involves regular clinic visits and seizure tracking.

Who may be eligible?

To be considered for this study, you must be 18 years old or older. The study is open to both men and women.

There might be other specific reasons why someone wouldn't be able to join, such as other medical conditions you have or other medicines you're taking. This is to make sure the study is safe for everyone involved and that the results are clear.

If you're interested, your doctor can check all the detailed requirements with you to see if this study would be a good fit.

Could this study suit you?

Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.

Are you 18 years old or older?
Do you have Lennox-Gastaut Syndrome?
Are you able to attend regular clinic appointments?
Are you currently on stable epilepsy medication?
Are you willing to keep a seizure diary?

Answer every question to see your result.

What does participation involve?

If you decide to take part in this study, you will be given either the new medicine (Clemizole HCl) or a placebo (a dummy pill) to take alongside your usual epilepsy medication. You won't know which one you are receiving. Initially, there will be a 'titration phase', where the dose of the study medicine is slowly increased to find the right level for you. This will be followed by a 'maintenance phase' where you continue taking that dose.

Throughout the study, you will have regular visits to the clinic so doctors can monitor your health, how often and how severe your seizures are, and any side effects you might experience. These visits will involve assessments, possibly some questionnaires about your well-being, and keeping a diary of your seizures. The total duration of your involvement, including all phases and follow-up, will be explained in detail by the study team.

Potential risks and benefits

Like all medical studies, there are potential benefits and risks. The potential benefit is that Clemizole HCl might help reduce your seizures and improve your quality of life. However, there's no guarantee the medicine will work for you, and there's a chance you could receive the placebo. Possible risks include experiencing side effects from the study medication. These will be fully explained to you before you decide to take part. Remember, you have the right to withdraw from the study at any time, for any reason, without it affecting your medical care.

Locations (6)

Some site locations are approximate. We're improving this — please verify with the trial team before travelling.

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Unverified
Italy
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Unverified
Spain
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Unverified
Hungary
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Unverified
Romania
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Unverified
Czechia
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Unverified
Poland

Common questions

What is Lennox-Gastaut Syndrome?

Lennox-Gastaut Syndrome is a severe and rare form of epilepsy that begins in childhood and causes frequent and varied types of seizures, often difficult to control with medicine.

What does 'multicenter' mean?

'Multicenter' means the study is being run in several hospitals or clinics at different locations, which helps gather more information and include a wider range of patients.

What is a 'placebo'?

A placebo is a 'dummy' pill that looks just like the real medicine but contains no active ingredients. It's used in studies to fairly compare if the new medicine works better than no treatment.

Will I know if I'm getting the real medicine or the placebo?

No, this is a 'double-blind' study, meaning neither you nor your doctors will know whether you're receiving the active medicine or the placebo. This helps ensure the results are unbiased.

What is a 'Phase III' trial?

A Phase III trial is a large study that comes after earlier, smaller studies. It's designed to confirm if a new medicine is safe and effective over a longer period and in more people.