A Two-year Open-label Extension Study of Ganaxolone in Patients With Drug-resistant Partial-onset Seizures

A follow-on, two-year open-label extension study of ganaxolone as add-on therapy in adult patients with drug-resistant partial-onset seizures

This study is a 2-year, open-label continuation for those patients benefiting from ganaxolone treatment after completing Protocol 1042-0603.

Eligibility Criteria:
Inclusion Criteria:

* Subjects who have completed all scheduled clinical study visits in the previous protocol 1042-0603 and have shown a minimum 35% improvement in mean 28-day seizure frequency over the last three 28-day periods in study 1042-603 as compared to the baseline of study 1042-603.
* Subjects whose daily study drug compliance in Study 1042-0603 was 90% or greater, and for whom the investigator feels that the subject was compliant with the full dose as prescribed.
* Able to give informed consent in writing, or have a legally authorized representative able to do so, after being properly informed of the nature and risks of the study and prior to engaging in any study-related procedures.
* Currently being treated and maintained with a stable regimen of 1, 2, or 3 anti-epileptic drugs (AED) at a consistent dose for one month prior to study entry.
* Implanted Vagus Nerve Stimulator (VNS) is permitted and will not count towards the number of concomitant AEDs.
* Able and willing to maintain an accurate and complete daily written seizure calendar or has a caregiver who is able and willing to maintain an accurate and complete daily written seizure calendar.
* Able and willing to take drug with food twice daily. Ganaxolone must be administered with food.
* Sexually active women of childbearing potential (WCBP) must be using a medically acceptable method of birth control and have a negative pregnancy test at Visit 1 and at subsequent visits.

Exclusion Criteria:

* Have any medical condition that, in the investigator's judgment, is considered to be clinically significant and could potentially affect subject safety or study outcome
* Experienced a Serious Adverse Event or a moderate or severe medically important adverse event judged probably or definitely related to open-label ganaxolone in the previous study, 1042-0603
* Have Alanine transferase (ALT; SGPT) or Aspartate transferase (AST; SGOT) levels \> 3 times upper limits of normal (ULN), or total bilirubin \>1.5 time ULN during Study 1042-0603.
* Have a history of malignancy within the past 2 years, with the exception of basal cell carcinoma.
* Seizures secondary to illicit drug or alcohol use, infection, neoplasm, demyelinating disease, degenerative neurological disease, or central nervous system (CNS) disease deemed progressive, metabolic illness, or progressive degenerative disease.
* Have active suicidal plan/intent, or have had active suicidal thoughts in the past 6 months. Have a history of an actual suicide attempt in the last 5 years or more than 1 lifetime actual suicide attempt as classified by the Columbia-Suicide Severity Rating Scale (C-SSRS).
* Have a history of drug or alcohol abuse within the past 5 years. As with other AEDs, the use of alcohol is not advised.
* Are currently following or planning to follow a ketogenic diet.
* Current use of vigabatrin or ezogabine (retigabine; Potiga; Trobalt) is not permitted.
* Females who are pregnant, currently breastfeeding or planning to become pregnant during the study.
* Inability/unwillingness to withhold grapefruit and grapefruit juice from diet during the entire clinical trial.