A Study to Test the Cardiac Effects of Padsevonil in Healthy Study Participants

A Single-Center, Randomized, Placebo-Controlled, 3 Treatment Period Crossover Study to Assess the Effect of Padsevonil on Cardiac Repolarization (QTc Interval) (Using Moxifloxacin as a Positive Control) in Healthy Study Participants

The purpose of the study is to evaluate the effects on cardiac repolarization of high-dose padsevonil (PSL) in comparison to placebo in healthy study participants.

Inclusion Criteria:

• Participant must be 18 to 55 years of age inclusive, at the time of signing the informed consent form (ICF)
• Participant who is overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, and cardiac monitoring
• Body weight of at least 50 kilogram (kg) (males) or 45 kg (females) and body mass index (BMI) within the range 18 to 30 kg/m2 (inclusive)
• Male and/or female:

A male study participant must agree to use contraception during the Treatment Period and for at least 90 days after the last dose of study medication and refrain from donating sperm during this period

A female participant is eligible to participate if she is not pregnant, not breastfeeding, and at least one of the following conditions applies:

Not a woman of childbearing potential (WOCBP) OR A WOCBP who agrees to follow the contraceptive guidance during the Treatment Period and for at least 90 days after the last dose of study medication

Exclusion Criteria:

• Participant has a known hypersensitivity to any components of the study medication or comparative drugs as stated in this protocol or history of tendon pathology secondary to use of quinolone antibiotics

• Participant has a history of unexplained syncope or a family history of sudden death due to long QT syndrome

• Participant has a present condition of respiratory or cardiovascular disorders, eg, cardiac insufficiency, coronary heart disease, hypertension, arrhythmia, tachyarrhythmia, or myocardial infarction

• Past or intended use of over-the-counter (OTC) or prescription medication including herbal medications within 2 weeks or 5 half-lives prior to dosing.

• Participant has used hepatic enzyme-inducing drugs (eg, glucocorticoids, phenobarbital, isoniazid, phenytoin, rifampicin, etc) within 2 months prior to the first dose of study medication

• Participant has previously received padsevonil (PSL) in this or any other study

• Participant has any clinically relevant electrocardiogram (ECG) finding at the Screening Visit or at Baseline. Participant has an abnormality in the 12-lead ECG that, in the opinion of the Investigator, increases the risks associated with participating in the study. In addition, any participant with any of the following findings will be excluded:

  1. QT interval corrected for heart rate using the Fridericia method (QTcF) ≥450 ms (on mean of triplicate ECG recordings);
  2. Other conduction abnormalities (defined as PR interval >220 ms);
  3. QRS interval >109 ms;
  4. Any rhythm other than sinus rhythm;
  5. Any history of Wolff-Parkinson-White Syndrome, Brugada Syndrome, unexplained syncope, or ventricular tachycardia;
  6. Family history of QTc prolongation or of unexplainable sudden death at <50 years of age

• Participant has made a blood or plasma donation or has had a comparable blood loss (>450 mL) within 30 days prior to the Screening Visit. Blood donation during the study is not permitted