Clinical Study of Cannabidiol in Children, Adolescents, and Young Adults With Fragile X Syndrome

Completed · Phase 3 · Has a placebo group

Conditions studied: Fragile X Syndrome

In brief

This is a randomized, double-blind, placebo-controlled, multiple-center study, to assess the efficacy and safety of Cannabidiol administered as ZYN002 for the treatment of children, adolescent, and young adult patients with Fragile X Syndrome (FXS). Eligible participants will participate in up to an 18-week treatment period, where all participants will receive placebo or active study drug. Patients ages 3 to \< 30 years will be eligible to participate.

Key facts

Study ID: NCT04977986
Run by: Zynerba Pharmaceuticals, Inc.
People needed: 215
Starts: 2021-09-13
Expected to finish: 2025-08-29
Last updated by the study team: 2025-12-17

Who can join

Age: 3 and older, up to 29. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Male or female children and adolescents aged 3 to < 30 years, at the time of Screening.
Patient resides with caregiver who will continue to provide consistent care throughout the study.
Judged by the Investigator to be in generally good health at Screening based upon the results of medical history, physical exam, 12-lead ECG and clinical laboratory test results. -Laboratory results outside the reference range must be documented as not clinically significant by both the Investigator and Sponsor.
Participants must have a diagnosis of FXS through molecular documentation of full mutation of the FMR1 gene documented through genetic testing at Screening.
Patients with a history of seizure disorders must currently be receiving treatment with a stable regimen of no more than two anti-seizure medications (ASMs) for the four weeks preceding study Screening; or must be seizure-free for one year if not currently receiving ASMs.
Patients taking psychoactive medication(s) should be on a stable regimen of not more than three such medications for at least fours weeks preceding Screening and must maintain that regimen throughout the study. Psychoactive medications include (but are not limited to) antipsychotics, antidepressants, anxiolytics, attention-deficit / hyperactivity disorder (ADHD) medications, and medications for sleep.
If patients are receiving non-pharmacological, behavioral and/or dietary interventions, they must be stable and have been doing so for three months prior to screening.
Patients have a body mass index between 12-30 kg/m2 (inclusive) and patients with a body mass index >30 kg/m2 and <40 kg/m2 with normal liver function laboratory values and with no immediate family history of fatty liver disease.
Females of childbearing potential must have a negative serum pregnancy test at the Screening Visit and a negative serum or urine pregnancy test at all designated visits.
Patients and parents/caregivers must be adequately informed of the nature and risks of the study and given written informed consent prior to Screening.
Patients and parents/caregivers agree to abide by all study restrictions and comply with all study procedures, and in the Investigator's opinion, are reliable and willing and able to comply with all protocol requirements and procedures.

You may not qualify if…

Females who are pregnant, nursing or planning a pregnancy; females of childbearing potential and male patients with a partner of childbearing potential who are unwilling or unable to use an acceptable method of contraception as outlined below for the duration of therapy and for three months after the last dose of study medication. Standard acceptable methods of contraception include abstinence (defined as refraining from heterosexual intercourse from screening to three months after the last dose of study medication: abstinence only applicable for females <18 years) or the use of a highly effective method of contraception, including hormonal contraception, diaphragm, cervical cap, vaginal sponge, condom, spermicide, vasectomy, or intrauterine device. The reliability of sexual abstinence needs to be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the subject. Periodic abstinence (calendar, symptothermal, post-ovulation methods) is not an acceptable method of contraception.
Patient has transitioned to independent living or living in a residential facility such as a university setting or congregate care.
History of significant allergic condition, significant drug-related hypersensitivity, or allergic reaction to any compound or chemical class related to ZYN002 or its excipients.
Exposure to any investigational drug or device less than or equal to 30 days prior to Screening or at any time during the study.
Alanine aminotransferase (ALT), aspartate aminotransferase (AST) or total bilirubin levels greater than or equal to 2 times the upper limit of normal or alkaline phosphatase levels greater than or equal to 3 times the upper limit of normal.
Use of cannabis or any THC or CBD-containing product within 3 months of Screening Visit or during the study (aside from ZYN002).
Patient has a positive drug screen, including ethanol, cocaine, THC, barbiturates, amphetamines (unless prescribed), benzodiazepines (except midazolam or comparable administered for blood draws and ECG collection), and opiates.
Patient is using the following AEDs (medications for the treatment of seizures and/ or epilepsy): clobazam, phenobarbital, ethosuximide, felbamate, carbamazepine, phenytoin, or vigabatrin.
Patient is using a strong inhibitor/inducer of CYP3A4 or sensitive substrate of CYP3A4 including but not limited to the following medications: midazolam (except single doses administered for the purposes of obtaining blood samples and ECG's), oral ketoconazole, fluconazole, nefazadone, rifampin, alfentanil, alfuzosin, amiodarone, cyclosporine, dasatinib, docetaxol, eplerenone, ergotamine, everolimus, fentanyl, halofantrine, irinotecan, lapatinib, levomethadyl, lumefantrine, nilotinib, pimozide, quinidine, ranolazine, sirolimus, tacrolimus, temsirolimus, toremifene, tretinioin, vincristine, vinorelbine, St. John's Wort, and grapefruit Juice/products.
Patients may not be taking any benzodiazepines (except single doses administered for the purposes of obtaining blood samples and ECGs) at screening or throughout the study.
Patient is expected to initiate or change pharmacologic or non-pharmacologic interventions during the course of the study.
Patient has an advanced, severe, or unstable disease that may interfere with the study outcome evaluations.
Patient has acute or progressive neurological disease, psychosis, schizophrenia or any other psychiatric disorder or severe mental abnormalities (other than FXS) that are likely to require changes in drug therapy or interfere with the study objectives or ability to adhere to protocol requirements.
Patient has a positive result for the presence of HBsAg, HCV, or HIV antibodies.
Patient has known history of cardiovascular disease, advanced arteriosclerosis, structural cardiac abnormality, cardiomyopathy, serious heart rhythm abnormalities, coronary artery disease, cardiac conduction problems, exercise-related cardiac events including syncope and pre-syncope, risk factors for Torsades de pointes (TdP) (e.g., heart failure, hypokalemia, family history of Long QT Syndrome), or other serious cardiac problems.
Any clinically significant condition or abnormal findings at the Screening Visit that would, in the opinion of the Investigator, preclude study participation or interfere with the evaluation of the study medication.
Any skin disease or condition including eczema, psoriasis, melanoma, acne, contact dermatitis, scarring, imperfections, lesions, tattoos, or discoloration that may affect treatment application, application site assessments or absorption of the trial drug.
History of treatment for, or evidence of, drug abuse within the past year.
Previous participation in a ZYN002 study (with the exception of patients who were screen failures in Study ZYN2-CL-016 and did not enter Study ZYN2-CL-017).
Patient responds "yes" to Question 4 or 5 on the C-SSRS (Children) during Screening or at any time on study.

Where it is running

Phoenix Children's Hospital — Phoenix, Arizona, United States
Science 37 — Culver City, California, United States
Amnova Clinical Research, LLC — Irvine, California, United States
Thompson Autism Center CHOC — Orange, California, United States
UC Davis Health System, MIND Institute — Sacramento, California, United States
Children's National Medical center — Washington D.C., District of Columbia, United States
University of Miami — Miami, Florida, United States
Rare Disease Research — Atlanta, Georgia, United States
Rush University Medical Center — Chicago, Illinois, United States
Kennedy Krieger Institute — Baltimore, Maryland, United States
Boston Children's Hospital — Boston, Massachusetts, United States
University of Minnesota Fragile X Clinic (Voyager Clinic) — Minneapolis, Minnesota, United States
University of Mississippi — Jackson, Mississippi, United States
The Fragile X Spectrum Disorder Clinic at Icahn School of Medicine at Mount Sinai, Division of Medical Genetics — New York, New York, United States
Central States Research — Tulsa, Oklahoma, United States
Penn State Hershey Medical Center — Hershey, Pennsylvania, United States
Greenwood Genetic Center — Greenville, South Carolina, United States
Primary Children's Hospital — Salt Lake City, Utah, United States
Westmead Children's Hospital — Sydney, New South Wales, Australia
Lady Cilento Children's Hospital - South Brisbane — Brisbane, Queensland, Australia
Genetics Clinics Australia — Melbourne, Victoria, Australia
Wellcome HRB Clinical Research Facility — Dublin, Ireland
Health New Zealand - Te Whatu Ora - Wellington Hospital — Newtown, Wellington Region, New Zealand
University of Edinburgh — Edinburgh, United Kingdom
Leicester Clinical Research — Leicester, United Kingdom

Full record on ClinicalTrials.gov

Trial information comes from ClinicalTrials.gov and is refreshed daily. TrialsForMe does not provide medical care and does not run the studies it lists.