Dravet SyndromePhase 3ARGUSNCT04462770
A Study of EPX-100 (Clemizole Hydrochloride) in Participants With Dravet Syndrome
A Phase 3 study testing Clemizole HCl in people with Dravet Syndrome, run by Epygenix at 86 sites in 11 countries.
Trial summary
This is a multicenter, Phase 3, randomized, double-blind, placebo-controlled study designed to evaluate the efficacy and safety of clemizole hydrochloride (EPX-100) as adjunctive therapy in children and adult participants with Dravet syndrome (DS). Read more about this study
- Who is it for?
- Ages 2 years and older
- Conditions the study is for
- Dravet Syndrome
- What is being tested?
- Clemizole HCl
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 150 participants
- Where
- 86 sitesin 11 countries
- Study dates
- 15 Sep 2020to May 2029
- Phase
- Phase 3
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 2 years and older
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- Male and female participants 2 years and older at time of consent.
- Participant or parent/legally authorized representative (LAR) willing and able to provide written informed consent and assent (if applicable) prior to initiation of any study related procedures.
- Clinical diagnosis of DS. Participants must have seizures which are not completely controlled by AEDs with the following criteria:
- Onset of seizures prior to 18 months of age,
- Normal development at onset,
- History of at least one type of countable motor seizure (CMS),
- Brain MRI without cortical malformation (not including mild atrophy associated with the natural progression of DS),
- Genetic mutation of the SCN1A gene must be documented.
Who cannot join
- Known sensitivity, allergy, or previous exposure to clemizole HCl.
- Exposure to any investigational drug or device <90 days prior to Screening or plans to participate in another drug or device trial at any time during the study.
- Seizures secondary to illicit drug (this includes concomitant use of tetrahydrocannabinol [THC] and nonprescription cannabidiol preparations) or alcohol use, infection, neoplasm, demyelinating disease, degenerative neurological disease, or central nervous system disease deemed progressive, metabolic illness, or progressive degenerative disease.
- Concurrent use of lorcaserin. Note: Prior use of lorcaserin is permitted if at least 30 days have passed since the last dose.
- Concurrent use of fenfluramine.
- Epilepsy surgery planned during the study or epilepsy surgery within 6 months prior to Screening.
Trial locations and contacts
86 sites in 11 countries. Contact the study team or a site near you to ask about taking part.
Eric Bauer contact
86 sites in 11 countries
United States31 sites, 18 recruiting
- Terminated
University of Michigan- Mott Children's Hospital
Ann Arbor, Michigan, 48109
- Withdrawn
Clinical Integrative Research Center of Atlanta (CIRCA)
Atlanta, Georgia, 30328
- Recruiting
Child Neurology Consultants of Austin
Austin, Texas, 78757
Victoria Henderson, BS, 210-416-4163, Victoria.Henderson@childneurotx.com
Talitha Durgin, talitha.durgin@childneurotx.com
- Recruiting
University of Alabama at Birmingham
Birmingham, Alabama, 35233
Kathryn Lalor, MD, 205-586-4464, klalor@uabmc.edu
Kathryn Lalor, MD
- Terminated
Ann & Robert H. Lurie Children's Hospital of Chicago
Chicago, Illinois, 60611
- Recruiting
Cincinnati Children's Hospital Medical Center
Cincinnati, Ohio, 45229
Samantha Ballard, BSN, RN, CPN, 513-803-3177, samantha.ballard@cchmc.org
Jessica Michael, jessica.michael@cchmc.org
- Recruiting
Cleveland Clinic
Cleveland, Ohio, 44195
Honglian Huang, PhD, 216-445-2366, huangh2@ccf.org
Elia Pestana Knight, MD
- Withdrawn
Nationwide Children's Hospital
Columbus, Ohio, 43205
- Withdrawn
UT Southwestern/Children's Health
Dallas, Texas, 75207
- Recruiting
Duke University Health System
Durham, North Carolina, 27710
Amanda Fristoe, 919-613-0767, amanda.fristoe@duke.edu
Muhammad Zafar, MD
- Withdrawn
Northeast Regional Epilepsy Group
Hackensack, New Jersey, 07601
- Terminated
Rare Disease Research FL
Kissimmee, Florida, 34746
- Recruiting
Arkansas Children's Hospital
Little Rock, Arkansas, 72202
Debopam Samanta, MD, 501-364-1850, dsamanta@uams.edu
Debopam Samanta, MD
- Terminated
Children's Hospital of Los Angeles
Los Angeles, California, 90027
- Recruiting
Norton Children's Research Institute
Louisville, Kentucky, 40202
Katie Harris, 502-629-5820 ext. 50920, katherine.bellamy@louisville.edu
Ines Roy, ines.roy@nortonhealthcare.org
- Recruiting
Neurology Center for Epilepsy and Seizures
Marlboro, New Jersey, 07746
Aimee Kinlan, 732-201-6179, Amy.Kinlan@tektonresearch.com
Amor Mehta, MD
- Terminated
Le Bonheur Children's Hospital
Memphis, Tennessee, 38103
- Not yet recruiting
Medical College of Wisconsin, Children's Wisconsin
Milwaukee, Wisconsin, 53266
Adriane Mueller, 414-266-7543, admueller@mcw.edu
Avantika Singh
- Recruiting
Science 37
Morrisville, North Carolina, 27560
- Recruiting
Yale School of Medicine - Yale-New Haven Hospital
New Haven, Connecticut, 06511
Aline Herlopian, MD
- Terminated
Weill Cornell Medical Center
New York, New York, 10021
- Withdrawn
Northwell Health - Lenox Hill Hospital
New York, New York, 10075
- Recruiting
Children's Nebraska
Omaha, Nebraska, 68114
Kym Abraham, 402-559-2977, kabraham@unmc.edu
Malayna Unkel, 402-559-0686
- Recruiting
University of California Irvine
Orange, California, 92868
Madeline Pak, 714-456-8413, mspak@hs.uci.edu
Marie Wencel, mwencel@hs.usci.edu
- Recruiting
The Children's Hospital of Philadelphia
Philadelphia, Pennsylvania, 19104
Rashmi Risbud, Mbio, 215-419-3212, risbudr@chop.edu
Eric Marsh, MD, PhD
- Recruiting
University of Utah
Salt Lake City, Utah, 84112
Laura Beeler, BS, 801-585-2121, laura.beeler@hsc.utah.edu
Daniel Ashman, daniel.ashman@hsc.utah.edu
- Terminated
UCSF Medical Center
San Francisco, California, 94158
- Recruiting
Seattle Children's Hospital
Seattle, Washington, 98105
Laurie Guidry, RN, 206-987-0058, laurie.guidry@seattlechildrens.org
Alex Collins, alex.collins@seattlechildrens.org
- Terminated
The Nemours Foundation
Wilmington, Delaware, 19803
- Recruiting
Wake Forest Baptist Medical Center
Winston-Salem, North Carolina, 27157
Tonya Woosley, 336-716-8940, twoosley@wakehealth.edu
Gautam S Popli, MD, MBA
- Recruiting
Pediatric Neurology and Epilepsy Specialists
Winter Park, Florida, 32789
Alex Rivera, 407-293-1122 ext. 121, ariveradelvalle@pediatricneurologyandepilepsy.com
Kathryn Bruner, kathryn.skilesbruner@pediatricneurologyandepilepsy.com
China18 sites, 18 recruiting
- Recruiting
Beijing Children's Hospital, Capital Medical University - PIN
Beijing, Beijing Municipality, 100045
Hui Xiong
- Recruiting
Peking University First Hospital - Daxing Campus
Beijing, Beijing Municipality, 102627
Yuwu Jiang
- Recruiting
The First Hospital of Jilin University
Changchun, Jilin, 130021
Jianmin Liang
- Recruiting
Hunan Children's Hospital
Changsha, Hunan, 10007
Sai Yang
- Recruiting
Xiangya Hospital Central South University
Changsha, Hunan
Jing Peng
- Recruiting
West China Second University Hospital, Sichuan University - Huaxi Campus
Chengdu, Sichuan, 610041
Rong Luo
- Recruiting
Chengdu Women's and Children's Central Hospital
Chengdu, Sichuan, 610073
Li Yan
- Recruiting
Children's Hospital of Chongqing Medical University
Chongqing, Chongqing Municipality, 400014
Li Jiang
- Recruiting
The Second Affiliated Hospital of Guangzhou Medical University
Guangzhou, Guangdong, 510260
Xiaorong Liu
- Recruiting
The Affiliated Hospital of Guizhou Medical University
Guiyang, Guizhou, 550004
Rong Ai
- Recruiting
The Children's Hospital Zhejiang University School of Medicine - Hubin Campus
Hangzhou, Zhejiang, 310052
Zhefeng Yuan
- Recruiting
Qilu Hospital of Shandong University
Jinan, Shandong, 250012
Baomin Li
- Recruiting
Jiangxi Provincial Children's Hospital - Donghu Campus
Nanchang, Jiangxi
Yong Chen
- Recruiting
Children's Hospital of Shanghai - Ludinglu Campus
Shanghai, Shanghai Municipality, 200062
Simei Wang
- Recruiting
Shenzhen Children's Hospital
Shenzhen, Guangdong, 518000
Dezhi Cao
- Recruiting
Wuhan Children's Hospital
Wuhan, Hubei, 430015
Dan Sun
- Recruiting
The Second Affiliated Hospital of Xi'an Jiaotong University
Xi'an, Shaanxi, 710004
Lin Yang
- Recruiting
Xuzhou Children's Hospital
Xuzhou, Jiangsu, 221006
Xiaoming Liu
India12 sites, 12 recruiting
- Recruiting
KLES Dr Prabhakar Kore Hospital and Medical Research Centre
Belagavi, Karnataka, 590010
Jyoti Guruputranavar, +91- 76195 48224, guruputranavarjyoti@gmail.com
Mahesh Kamate
- Not yet recruiting
National Institute of Mental Health and Neurosciences (NIMHANS)
Bengaluru, Karnataka, 560029
Ajay Asranna, 91-8943612626, ajayasranna@gmail.com
Ajay Asranna
- Not yet recruiting
Rainbow Children's Hospital
Hyderabad, Andhra Pradesh, 500034
Ramesh Konanki, 7386668959, drkonankiramesh@rainbowhospitals.in
Ramesh Konanki
- Not yet recruiting
Yashoda Hospitals Hitec City
Hyderabad, Andhra Pradesh, 500081
Shameer Basha Shaik, +91- 9966596459, research2.bnj@rainbowhospitals.in
Katakam Deepthi, researchneuroscience3@gmail.com
- Recruiting
Amrita Institute of Medical Sciences & Research Center
Kochi, Kerala, 682041
Deepa Gijesh, +919995184399, deepagijesh@aims.amrita.edu
Nithya Kumar, nithyankumar2@gmail.com
- Recruiting
SRCC Children's Hospital
Mahālakshmi, Mumbai, 400034
Vijetha Shetty, +91- 8291207577, drgadgilexecutiveassistant@gmail.com
Pradnya Gadgil
- Recruiting
Jaslok Hospital & Research Centre
Mumbai, Maharashtra, 400026
Pradnya Shinde, +919757138607, pradnyashinde2210@gmail.com
Anita Hegde
- Recruiting
Central India Cardiology Hospital and Research Institute
Nagpur, Maharashtra, 440015
Krutika Satokar, +919359723117, Krutika@hrapl.in
Amarjeet Wagh
- Recruiting
All India Institute of Medical Sciences (AIIMS)
New Delhi, National Capital Territory of Delhi, 110029
Shailly Katoch, +919878507624, katochshailly@gmail.com
Sheffali Gulati
- Not yet recruiting
KEM Hospital Research Centre
Pune, Maharashta, 411011
Aishwarya Patil, +91- 98999476422, aishwaryauttampatil@gmail.com
Nandan Yardi
- Recruiting
Saachi Children's Hospital
Surat, Gujarat, 395002
Honey Patel, 73833-33348, honey.patel@visaferesearch.com
Ritesh Shah
- Recruiting
Christian Medical College
Vellore, Tamil Nadu, 632004
G Ponezhil, +918124235630, argustrialpnucmc@gmail.com
Maya Thomas
Argentina4 sites, 4 recruiting
- Not yet recruiting
Fundación Para La Lucha Contra Las Enfermedades Neurológicas de La Infancia - FLENI
Buenos Aires
Walter Silva, 5491138310315, whsilva@fleni.org.ar
Walter Silva
- Not yet recruiting
Conci Carpinella - Santa Rosa N° 748
Córdoba
Hector Martinez, 5493517473258, hectorariel_martinez@hotmail.com
Hector Martinez
- Not yet recruiting
Instituto Privado Kremer
Córdoba
Carlos Deabato, 0351 3303166, deabatoarg@gmail.com
Carlos Deabato
- Not yet recruiting
Instituto Médico Rivarola (GIEN SRL)
San Luis
Pablo Lopez, (54115) 239-6010, pabloadrian.lopez@swissmedical.com.ar
Pablo Lopez
Brazil4 sites, 4 recruiting
- Not yet recruiting
Hospital Universitário da Universidade Estadual de Campinas - UNICAMP
Campinas
Fernando Cendes, (55193) 521-7372, fcendes@unicamp.br
Fernando Cendes
- Not yet recruiting
Fundacao Faculdade Regional de Medicina de Sao Jose Do Rio Preto Hospital de Base - PPDS
São José do Rio Preto
Lucia Neves Marques, 55 17 99608-4244, luciahelenanevesmarques@gmail.com
Lucia Neves Marques
- Not yet recruiting
Hospital São Paulo da Universidade Federal de Sao Paulo - Escola Paulista de Medicina UNIFESP-EPM
São Paulo
Laura Maria Guilhoto, (55115) 579-2581, lauragui@gmail.com
Laura Maria Guilhoto
- Not yet recruiting
Instituto de Psiquiatria HC FMUSP
São Paulo
Kette Dualibi Ramos Valente, 551126616518, kette.valente@hc.fm.usp.br
Kette Dualibi Ramos Valente
Canada4 sites, 4 recruiting
- Recruiting
Children's Hospital of Eastern Ontario Research Institute Inc.
Ottawa, Ontario, K1H 8L1
Sarah Healy, MSc, 613-737-7600 ext. 1605, shealy@cheo.on.ca
Aristhana Kathiresu, AKathiresu@cheo.on.ca
- Recruiting
The Hospital for Sick Children
Toronto, Ontario, M5G 1X8
Laura MacDougall, PhD, CCRP, 416-813-7996, laura.macdougall@sickkids.ca
Elizabeth Donner, MD
- Recruiting
Toronto Western Hospital, University Health Network
Toronto, Ontario, M5T 2S8
Sarah Iskandarani, MD, 416-603-5800 ext. 5906, sarah.iskandarani@uhn.ca
Quratulain Zulfiqar, quaratulain.zulfiqar_ali@uhn.ca
- Recruiting
UBC Children's Hospital Research Institute
Vancouver, British Columbia, V6H 3V1
Dora Xiong, 604-875-2345 ext. 6728, dora.xiong@cw.bc.ca
Vanessa Diamond, MD, vanessa.diamond@cw.bc.ca
Georgia3 sites, 3 recruiting
- Recruiting
Tbilisi State Medical University, Givi Zhvania Academic, Clinic of Pediatry
Tbilisi, 0159
Tinatin Nadiradze, MD, +995558320502, t.nadiradze@tsmu.edu
Sophia Bakhtadze, MD
- Recruiting
Medi Club Georgia LLC
Tbilisi, 0160
Tamar Gachechiladze, MD, +995598357909, tamogachechiladze@yahoo.com
Gia Melikishvili, MD
- Recruiting
Institute of Neurology and Neuropsychology LTD
Tbilisi, 0186
Sopiko Digmelashvili, MD, +995551516066, sopikodigmelashvili@gmail.com
David Kvernadze, MD
Poland3 sites, 3 recruiting
- Recruiting
University Clinical Center in Gdansk, Division of Developmental Neurology
Gdansk, 80-952
Angelika Kamińska, +48 58 349 23 31, ankaminska@uck.gda.pl
Maria Mazuriewicz-Bełdzińska, MD
- Recruiting
Medical Centre Plejady
Krakow, 30-363
Anna Mackowicz, +48 50 107 68 35, anna.mackowicz@plejady.com.pl
Marta Żołnowska, MD
- Recruiting
Institute of Mother and Child
Warsaw, 01-211
Zuzanna Kuczer, +48608338848, zuzanna.kuczer@imid.med.pl
Elżbieta Stawicka, MD
United Kingdom3 sites
- Active, not recruiting
Cardiff and Vale University Health Board
Cardiff, CF14 4XW
- Completed
Great Ormond Street Hospital For Children
London, WC1N 1EH
- Completed
Sheffield Children's Hospital
Sheffield, S102TH
Hungary2 sites, 2 recruiting
- Recruiting
Semmelweis University
Budapest, 1094
Andrasne Korodi, +06208258208, Korodi.kata@gmail.com
Kristof Farkas, MD
- Recruiting
University of Debrecen
Debrecen, 4032
Monika Bessenyei, MD, +0036709450368, besenyei.monika@med.unideb.hu
Mónika Bessenyei, MD
Spain2 sites, 2 recruiting
- Recruiting
Hospital de la Santa Creu i Sant Pau
Barcelona, 08025
Angela Fraga, +34633160818, AFraga@santpau.cat
Marc Alegre, MAlegreH@santpau.cat
- Recruiting
Hospital Infantil Universitario Niño Jesús
Madrid, Madrid Provincia, 28009
Nuria Ventosino, +346620708323 ext. 7351, nuria.ventosino@salud.madrid.org
Victor Soto, MD
About this study
Official title: A 20-Week Multicenter, Randomized, Double-Blind, Placebo-Controlled Trial of EPX-100 (Clemizole Hydrochloride) as Adjunctive Therapy in Children and Adult Participants With Dravet Syndrome (ARGUS Trial)
This is a multicenter, Phase 3, randomized, double-blind, placebo-controlled study designed to evaluate the efficacy and safety of clemizole hydrochloride (EPX-100) as adjunctive therapy in children and adult participants with Dravet syndrome (DS).
Read the detailed description
The study consists of an Observational Phase, a Double-blind Phase consisting of a dose titration and a maintenance period and an optional Open-Label Extension (OLE) Phase.
- Conditions
- Dravet Syndrome
- Being tested
- Clemizole HCl, Placebo
- Keywords
- Clemizole hydrochloride, Convulsive seizure, Pediatric epilepsy, Dravet syndrome
- Medical subject headings
- Epilepsies, Myoclonic, Seizures
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Clemizole HClDrug
Also called EPX-100
Clemizole HCl will be administered as an oral solution.
PlaceboDrug
Flavor- and color-matching placebo will be administered as an oral solution.
| Study group | Role | What they receive |
|---|---|---|
| Double-blind Phase: Clemizole HCl | Experimental | Participants will receive clemizole HCl twice a day (BID). Receives: Drug: Clemizole HCl |
| Double-blind Phase: Placebo | Placebo comparator | Participants will receive matching placebo BID. Receives: Drug: Placebo |
| OLE Phase: Clemizole HCl | Experimental | Participants will receive clemizole HCL BID. Receives: Drug: Clemizole HCl |
What is being measured
The primary outcome is the main question the study is designed to answer.
Percent Change in Countable Motor Seizures Per 28 Days (CMS-28) in the Titration Plus Maintenance Periods Relative to Baseline
Measured: From Baseline up to Week 16
European Union: Percent Change in CMS-28 in the Maintenance Period Relative to Baseline
Measured: From Baseline up to Week 16
Secondary outcomes (7)
Percentage of Participants with >=50% reduction in CMS-28 Relative to Baseline
Measured: From Baseline up to Week 16
Number of Countable Motor Seizure-free Days Relative to Baseline
Measured: From Baseline up to Week 16
Clinical Global Impression of Improvement - Clinician (CGII-C) Score
Measured: Week 16
Clinical Global Impression of Improvement - Participant/Caregiver (CGII-P) Score
Measured: Week 16
Percent Change in All Seizures Relative to Baseline
Measured: From Baseline up to Week 16
Incidence of Rescue Anti-epileptic Drug (AED) Use Relative to Baseline
Measured: From Baseline up to Week 16
Number of Participants with Treatment-Emergent Adverse Events (TEAEs)
Measured: From Baseline up to Week 18
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted8 Jul 2020
- Study start15 Sep 2020
- Primary completionApr 2027 (estimated)
- Study completionMay 2029 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Dravet SyndromeStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- Patients are randomized 1:1 to clemizole HCl (EPX-100) or placebo.
- Masking
- Triple blind
- Who is masked
- Participant, Care provider, Investigator
- Enrolment
- 150 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Epygenix
- Sponsor type
- Industry (pharma, biotech, devices)
- Collaborators
- Harmony Biosciences Management, Inc.
- Responsible party
- Sponsor
- Investigators
- Amit Ray, MD, Study director, Harmony Biosciences Management, Inc.
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04462770
- Sponsor's protocol ID
- EPX-100-001
- Other IDs
- 2024-518628-57-00
- Acronym
- ARGUS
- Status last verified
- Oct 2026
- First submitted
- 6 Jul 2020
- Last updated
- 29 Oct 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 29 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A 20-Week Multicenter, Randomized, Double-Blind, Placebo-Controlled Trial of EPX-100 (Clemizole Hydrochloride) as Adjunctive Therapy in Children and Adult Participants With Dravet Syndrome (ARGUS Trial)
- ClinicalTrials.gov ID
- NCT04462770
- Acronym / sponsor ID
- ARGUS / EPX-100-001
- Conditions
- Dravet Syndrome
- Keywords
- Clemizole hydrochloride, Convulsive seizure, Pediatric epilepsy, Dravet syndrome
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 150 participants (estimated)
- Lead sponsor
- EpygenixIndustry (pharma, biotech, devices)
- Collaborators
- Harmony Biosciences Management, Inc.
- Study start
- 15 Sep 2020 (actual)
- Primary completion
- Apr 2027 (estimated)
- Study completion
- May 2029 (estimated)
- First posted
- 8 Jul 2020 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This is a multicenter, Phase 3, randomized, double-blind, placebo-controlled study designed to evaluate the efficacy and safety of clemizole hydrochloride (EPX-100) as adjunctive therapy in children and adult participants with Dravet syndrome (DS).
Detailed description
The study consists of an Observational Phase, a Double-blind Phase consisting of a dose titration and a maintenance period and an optional Open-Label Extension (OLE) Phase.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, care provider, investigator)
- Number of arms
- 3
- Model description
- Patients are randomized 1:1 to clemizole HCl (EPX-100) or placebo.
| Arm | Type | Receives |
|---|---|---|
| Double-blind Phase: Clemizole HCl | Experimental | Drug: Clemizole HClParticipants will receive clemizole HCl twice a day (BID). |
| Double-blind Phase: Placebo | Placebo comparator | Drug: PlaceboParticipants will receive matching placebo BID. |
| OLE Phase: Clemizole HCl | Experimental | Drug: Clemizole HClParticipants will receive clemizole HCL BID. |
Who may qualify
- Ages
- 2 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (8 listed)
- Male and female participants 2 years and older at time of consent.
- Participant or parent/legally authorized representative (LAR) willing and able to provide written informed consent and assent (if applicable) prior to initiation of any study related procedures.
- Clinical diagnosis of DS. Participants must have seizures which are not completely controlled by AEDs with the following criteria:
Key exclusion criteria (6 listed)
- Known sensitivity, allergy, or previous exposure to clemizole HCl.
- Exposure to any investigational drug or device <90 days prior to Screening or plans to participate in another drug or device trial at any time during the study.
- Seizures secondary to illicit drug (this includes concomitant use of tetrahydrocannabinol [THC] and nonprescription cannabidiol preparations) or alcohol use, infection, neoplasm, demyelinating disease, degenerative neurological disease, or central nervous system disease deemed progressive, metabolic illness, or progressive degenerative disease.
- Concurrent use of lorcaserin. Note: Prior use of lorcaserin is permitted if at least 30 days have passed since the last dose.
- Concurrent use of fenfluramine.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Clemizole HClAlso: EPX-100Clemizole HCl will be administered as an oral solution. | Drug | Double-blind Phase: Clemizole HCl, OLE Phase: Clemizole HCl |
| PlaceboFlavor- and color-matching placebo will be administered as an oral solution. | Drug | Double-blind Phase: Placebo |
Primary outcome
Percent Change in Countable Motor Seizures Per 28 Days (CMS-28) in the Titration Plus Maintenance Periods Relative to Baseline
Time frame: From Baseline up to Week 16
European Union: Percent Change in CMS-28 in the Maintenance Period Relative to Baseline
Time frame: From Baseline up to Week 16
7 secondary outcomes
Percentage of Participants with >=50% reduction in CMS-28 Relative to Baseline
Time frame: From Baseline up to Week 16
Number of Countable Motor Seizure-free Days Relative to Baseline
Time frame: From Baseline up to Week 16
Clinical Global Impression of Improvement - Clinician (CGII-C) Score
Time frame: Week 16
Clinical Global Impression of Improvement - Participant/Caregiver (CGII-P) Score
Time frame: Week 16
Percent Change in All Seizures Relative to Baseline
Time frame: From Baseline up to Week 16
Incidence of Rescue Anti-epileptic Drug (AED) Use Relative to Baseline
Time frame: From Baseline up to Week 16
Number of Participants with Treatment-Emergent Adverse Events (TEAEs)
Time frame: From Baseline up to Week 18
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Oct 2026.
- Individual participant dataSharing planned: No
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Dravet Syndrome
Active, not recruitingPhase 3
A Double-blind Study Evaluating the Efficacy, Safety, and Tolerability of Zorevunersen in Patients With Dravet Syndrome
Dravet Syndrome
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Eric Bauer contact
Amit Ray, MD study director
Harmony Biosciences Management, Inc.
86 sites in 11 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing Clemizole HCl in people with Dravet Syndrome, run by Epygenix at 86 sites in 11 countries.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 8 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 29 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 86 sites in United States, China, India, Argentina, Brazil and 6 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Krystle Rapchak (+1 (312) 847-1289, clinicaltrials@harmonybiosciences.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Percent Change in Countable Motor Seizures Per 28 Days (CMS-28) in the Titration Plus Maintenance Periods Relative to Baseline (time frame: From Baseline up to Week 16). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Oct 2026.