Safety and Tolerability Study of SPN-817 in Adult Patients With Treatment Resistant Epilepsy

Inclusion Criteria:

1. A diagnosis of treatment resistant epilepsy as adjudicated by the Epilepsy StudyConsortium.
2. Is male or female, aged 18 to ≤ 70 years at screening.
3. Is able to read, understand, and sign the Informed Consent Form (ICF). If theparticipant is unable to sign informed consent, a Legally Authorized Representative (LAR) will complete the ICF.
4. Ability to keep accurate seizure diaries (with the aid of a caregiver as needed).
5. Weight within the normal or overweight ranges according to accepted values of the BodyMass Index Chart (18.0 to 35 kg/m2).
6. Is able to swallow capsules whole without crushing, chewing, or cutting.
7. Is willing to adhere to all study procedures and able to attend study visits withinthe specified time windows.
8. Failure of at least 2 tolerated, appropriately chosen and adequately dosed ASM drugschedules to achieve sustained seizure freedom.
9. Taking at least 1 ASM at Screening and Baseline.
10. At least 4 seizures accepted by the Epilepsy Study Consortium for the secondaryoutcome (adjudicated as "probable seizures" that are countable) during the 42-daybaseline seizure diary period, and no more than a 21-day period that was seizure-free.
11. A clinical diagnosis of Focal Cortical Dysplasia (FCD) Type I or Type II (approximately n=10) confirmed by:
12. Likely FCD supported by neuroimaging that has been performed in the last 5 years,or
13. History of surgical resection of the cortical dysplasia that ishistopathologically confirmed in patients who continue to have uncontrolledseizures without a compelling alternate explanation for ongoing seizures. Note: The Epilepsy Study Consortium will review to confirm FCD/probable FCD diagnosis.
14. Be in good general health in the judgment of the PI based upon medical history,physical examination, standard 12-lead ECG, and clinical laboratory evaluationsobtained during the Screening Period
15. Be able to comply with all study-specified procedures.
16. Non-pregnant females of childbearing potential (FOCP) who are either sexually inactive (abstinent) or, if sexually active with a male partner who is biologically capable ofhaving children, must agree to use one of the following acceptable birth controlmethods beginning 30 days prior to the first dose of SPN-817, throughout the study,and for 30 days following the last dose:
17. Simultaneous use of male condom and intra-uterine contraceptive device (IUD)placed at least 4 weeks prior to first SPN-817 administration
18. Surgically sterile male partner
19. Simultaneous use of male condom and diaphragm with spermicide
20. Established hormonal contraceptive Females are considered not to be of childbearing potential if they are eitherpost-menopausal (amenorrhea for at least 2 years and serum follicle stimulatinghormone [FSH] level of >40 IU/L) or permanently sterilized (e.g., bilateral tuballigation, hysterectomy, bilateral oophorectomy) for 6 months minimum.
21. Males must:
22. Use 2 methods of contraception in combination if his female partner is ofchildbearing potential; this combination of contraceptive methods must be usedfrom the Screening Visit to ≥ 1 month after the last dose of SPN-817, or
23. Have been surgically sterilized prior to the Screening Visit.
24. Refrain from donating any sperm until completion of the EOS Visit.
25. Patients who were previously enrolled in the BNI-02-1b FIAS study and benefited fromthe treatment, following the approval by both the PI and the sponsor to be enrolled inthis study.

Exclusion Criteria:

1. Has taken huperzine A within the past year, with the exception of patients who werepreviously enrolled in the BNI-02-1b FIAS study, benefited from the treatment, andapproved by the PI and the sponsor to be enrolled in this study.
2. Is planning to become pregnant or impregnate spouse, not using an acceptable method ofbirth control (defined as use of double-barrier birth control methods, use of oralcontraceptives, or surgical sterilization), pregnant, or nursing.
3. Patients with combined focal and generalized syndrome as evidenced by severedevelopmental delay and multiple seizure types, confirmed by EEG (e.g., Lennox-Gastautsyndrome). Patient should also be excluded in case of non-diagnostic information.
4. Has non-epileptic events that could be confused by the patient and/or study staff asepileptic seizures.
5. Has only seizures that are difficult to count; for example, has seizures that are notclinically observable.
6. Has a history of only seizure clusters, for example, seizure clusters defined asmultiple seizures with at least one seizure within 30 minutes of the previous seizure.
7. Has a history of status epilepticus in the 6 months prior to Screening.
8. Change in ASM regimen in the last 28 days prior to Screening. No changes in ASMs areallowed throughout the study period.
9. Vagus nerve stimulation (VNS), deep brain stimulation (DBS), responsiveneurostimulator system (RNS), or other neurostimulation for epilepsy device implantedor activated <1 year prior to Screening; stimulation parameters that have been stablefor <3 months; battery life of unit not anticipated to extend for duration of trial;or epilepsy surgery <1 year prior to Screening.
10. Active suicidal plan/intent in the past 6 months, or a history of suicide attempt inthe last 2 years, or more than 1 lifetime suicide attempt. History of suicidalideation.
11. Any condition that may impact a patient's ability to follow study procedures or apatient's safety, based on what is known about the pharmacology/toxicology profile ofthe trial agent(s).
12. Has a pre-existing medical condition (including an existing progressive ordegenerative neurological disorder including brain tumor, active encephalitis, activemeningitis or abscess) or takes medications that, in the PI's opinion, could interferewith the patient's suitability for participation in the study.
13. Has a history or evidence of current significant psychiatric disturbance (e.g.,schizophrenia, schizoaffective, or bipolar disorder) that would preclude meaningfulparticipation in the study procedures.
14. A history in the past 2 years or evidence of current alcohol and/or substance usedisorder as defined by the Diagnostic and Statistical Manual of Mental Disorders 5thedition.
15. Has had any clinical laboratory abnormalities within the 2 months prior to screeningconsidered of clinical significance by the PI.
16. Is HIV/Hepatitis B/Hepatitis C positive or has a positive urine drug screen.
17. Tobacco use as indicated by >5 cigarettes per week or the equivalent, 30 days prior toDay -1.
18. Is on concomitant therapy with non-ASMs that are cholinergic.
19. Is currently taking or within the 3 days prior to enrollment has takenEpigallocatechin gallate (EGCG); or consumed foods or drinks containing EGCG,including green, white, or oolong teas and certain black teas, or food containing >100grams of carob powder. EGCG cannot be consumed throughout the study.
20. Has participated in any clinical investigational drug or device study within 4 weeksprior to study entry or within 5 half-lives of the clinical investigational drug,whichever is longer.
21. Clinically significant cardiologic abnormalities at Screening. One repeat assessmentis allowed per investigator discretion.
22. Abnormal ECG that is, in the investigator's opinion, clinically significantincluding heart rate (HR) <50 bpm (average of 3 recordings)
23. PR interval > 220 ms
24. QRS interval ≥ 120 ms
25. QTcF (QT corrected for heart rate using Fridericia's method) interval > 450 msfor males and interval > 475 ms for females
26. Second or third-degree atrioventricular block
27. Any rhythm, other than sinus rhythm, that is interpreted by the investigator tobe clinically significant
28. Creatinine clearance < 90 mL/min, according to the Cockcroft-Gault equation atScreening.
29. Clinically significant vital sign abnormalities (systolic blood pressure lower than 90or over 140 mmHg, diastolic blood pressure lower than 50 or over 90 mmHg, or HR lessthan 50 or over 100 bpm) at Screening.
30. Patient has had greater than 2 allergic reactions to an ASM or one serioushypersensitivity reaction to an ASM.
31. Patients who donated 50 to 499 mL of blood within 30 days or more than 499 mL within 56 days prior to Day 1 dosing or have hemoglobin <128 g/L (males) or <115 g/L (females) and hematocrit <0.37 L/L (males) or <0.32 L/L (females) at Screening.Following screening and throughout the study, patient should not donate blood.
32. Any reason which, in the opinion of the PI, would prevent the patient fromparticipating in the study