Adjunctive Ganaxolone Treatment (Part A) in TSC Followed by Long-term Treatment (Part B)

Study Purpose

To assess preliminary safety and efficacy of ganaxolone as adjunctive therapy for the treatment of primary seizure types in patients with genetically- or clinically-confirmed TSC-related epilepsy through the end of the 12 week treatment period.

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 2 Years - 65 Years
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria (Part A):

  • - Clinical or mutational diagnosis of TSC - Failure to control seizures despite appropriate trial of 2 or more ASMs at therapeutic doses.
  • - Have at least 8 countable/witnessed primary seizures during the 4-week baseline period with at least 1 primary seizure occurring in at least 3 of the 4 weeks of baseline.
Inclusion Criteria (Part B) • Patients have experienced ≥ 35% reduction in primary seizure frequency during the Part A treatment period compared to the 4-week Baseline Period. Exclusion Criteria (Part A):
  • - Previous exposure to GNX - Pregnant or breastfeeding - Concurrent use of strong inducers or inhibitors of cytochrome P450 (CYP)3A4/5/7.
Any strong inhibitor or inducer of CYP3A4/5/7 must be discontinued at least 28 days before Visit 2, study drug initiation. This does not include approved ASMs.
  • - Patients who have been taking felbamate for less than 1 year prior to screening - Patients who test positive for tetrahydrocannabinol (THC) or non-approved cannabidiol (CBD) via plasma drug screen - Chronic use of oral steroid medications, ketoconazole (except for topical formulations), St. John's Wort, or other IPs is not permitted - Have an active CNS infection, demyelinating disease, degenerative neurological disease, or CNS disease deemed progressive.
This includes tumor growth which in the opinion of the investigator could affect primary seizure control - Patients with significant renal insufficiency, estimated glomerular filtration rate (eGFR) < 30 mL/min (calculated using the Cockcroft-Gault formula or Pediatric GFR calculator or Bedside Schwartz), will be excluded from study entry or will be discontinued if the criterion is met post baseline - Have been exposed to any other investigational drug within 30 days or fewer than 5 half lives (whichever is shorter) prior to the screening visit

Trial Details

Trial ID:

This trial id was obtained from, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Phase 2
Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

Marinus Pharmaceuticals
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Maciej Gasior, MD
Principal Investigator Affiliation Marinus Pharmaceuticals, Inc.
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Recruiting
Countries United States

The disease, disorder, syndrome, illness, or injury that is being studied.

Tuberous Sclerosis
Additional Details

This is an OL proof of concept study of adjunctive GNX treatment in patients with a confirmed clinical diagnosis of TSC and/or a mutation in either the TSC1 or TSC2 gene. The trial consists of two parts: Part A consists of a 4-week baseline period followed by a 12-week treatment period (4-week titration and 8-week maintenance). For patients not continuing in the 24-week OLE period (Part B), a 2-week taper period followed by a 2-week safety period would follow. The main difference between Part A and Part B is the length of treatment, less frequent assessments, and the ability to alter drug doses (both GNX and other antiepileptic drug [AED] treatments which includes initiating and stopping other medications) based on investigator evaluation of the patient's clinical course during Part B. Patients with a seizure frequency reduction rate of ≥ 35% during the 12-week treatment period in Part A compared to baseline may continue into Part B ("OLE eligible"), to assess long-term safety, efficacy and tolerability in patients with TSC-related Epilepsy.

Arms & Interventions


Other: Open-label

ganaxolone suspension (50 mg/ml) TID for 12 weeks with 24 week extension


Drug: - Ganaxolone

titration followed by maintenance and extension period

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Marinus Research Site, Oakland, California


Not yet recruiting


Marinus Research Site

Oakland, California, 94609

Marinus Research Site, Palo Alto, California


Active, not recruiting


Marinus Research Site

Palo Alto, California, 94304

Marinus Research Site, Boston, Massachusetts


Not yet recruiting


Marinus Research Site

Boston, Massachusetts, 02115

Marinus Research Site, Durham, North Carolina


Not yet recruiting


Marinus Research Site

Durham, North Carolina, 27710

Marinus Research Site, Cincinnati, Ohio


Not yet recruiting


Marinus Research Site

Cincinnati, Ohio, 45229

Marinus Research Site, Houston, Texas




Marinus Research Site

Houston, Texas, 77030

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