Placebo-Controlled, Double-Blind, Study to Determine the Safety and Efficacy of SDX in Patients With IH

NCT ID: NCT05668754

Last Updated: 2025-02-03

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 50 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2022-12-28
• Study Completion Date: 2024-03-21

Brief Summary

This is a study of the safety, efficacy and pharmacokinetics (PK) of Serdexmethylphenidate (SDX) compared to placebo in subjects with Idiopathic Hypersomnia (IH).

Detailed Description

SDX is a prodrug of dexmethylphenidate (d-MPH). SDX behaves as a prototypical prodrug that is devoid of pharmacological effects until metabolized to active d-MPH. Central nervous system (CNS) stimulants, including d-MPH products, are being used off-label by patients with IH. The potential advantage of SDX-derived d-MPH is its unique PK profile with rising d-MPH plasma concentrations at approximately 3 hours postdose followed by a broad peak from approximately 8 to 12 hours postdose (without sharp exposure spikes), and a gradual decline after the peak.

The optimal dose of SDX will be determined for each participant by titration based on individual tolerability and response during the 5-week SDX-only Open-Label Titration period (OLTP), after which 2/3 of the participants will continue to receive SDX and 1/3 of the participants will receive placebo (withdrawal design) in the 2-week Double-Blind Withdrawal Period (DBWP).

The study will evaluate safety (primary endpoint), efficacy and PK in patients with IH after daily oral administration of SDX either once per day in the evening (qd pm) or twice per day (morning and evening: bid). The study is expected to inform about the optimal SDX dose range and the best dose regimen (nighttime dosing or twice-per-day) for further studies in patients with IH and narcolepsy. The evening dosing regimen (just before bedtime) is of interest since there is little or no exposure to d-MPH for the first several hours post-dose and the mean peak d-MPH concentration occurs at 10-12 hours post-dose (ie, in the morning after a nighttime dose).

Conditions

Idiopathic Hypersomnia

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: DOUBLE

Study Groups

Experimental: SDX

SDX capsules at the optimized daily dose, once in the evening daily (qd pm) or twice per day (bid), for 2 weeks (DBWP)

Group Type: EXPERIMENTAL

Serdexmethylphenidate

Intervention Type: DRUG

Participants randomized to active drug will receive their optimized dose according to a dosing regimen set by randomization at the start of the OLTP. The 4 possible oral SDX doses are 80, 160, 240, or 320 mg/day. The optimal SDX dose will be determined during the 5-week OLTP preceding the 2-week DBWP.

Active Comparator

Placebo capsules once in the evening daily (qd pm) or twice per day (bid), for 2 weeks (DBWP)

Group Type: PLACEBO_COMPARATOR

Serdexmethylphenidate

Intervention Type: DRUG

Participants randomized to active drug will receive their optimized dose according to a dosing regimen set by randomization at the start of the OLTP. The 4 possible oral SDX doses are 80, 160, 240, or 320 mg/day. The optimal SDX dose will be determined during the 5-week OLTP preceding the 2-week DBWP.

Placebo

Intervention Type: OTHER

Participants randomized to placebo will receive matching placebo capsules to the optimized dose established at the end of the OLTP, according to a dosing regimen set by randomization at the start of the OLTP.

Interventions

Serdexmethylphenidate

Participants randomized to active drug will receive their optimized dose according to a dosing regimen set by randomization at the start of the OLTP. The 4 possible oral SDX doses are 80, 160, 240, or 320 mg/day. The optimal SDX dose will be determined during the 5-week OLTP preceding the 2-week DBWP.

Intervention Type: DRUG

Placebo

Participants randomized to placebo will receive matching placebo capsules to the optimized dose established at the end of the OLTP, according to a dosing regimen set by randomization at the start of the OLTP.

Intervention Type: OTHER

Other Intervention Names

SDX

Eligibility Criteria

Inclusion Criteria

1. At least 18 years of age at the time of consent

2. Body Mass Index (BMI) ≤35 kg/m2

3. Documented primary diagnosis of IH according to the International Classification of Sleep Disorders (ICSD-3) criteria

4. At the Screening Visit and Baseline Visit (start of OLTP), Epworth Sleepiness Scale (ESS) scores ≥11

5. Average nightly Total Sleep Time (TST) of ≥7 hours, per subject history and confirmed during screening.

6. Subject must be in general good health defined as the absence of any clinically relevant abnormalities as determined by the Investigator based on physical and neurological examinations, vital signs, ECGs, medical history, and clinical laboratory values (hematology, chemistry, and urinalysis) at Screening.

7. If currently treated with nicotine replacement therapy, must have been taking the same regimen and dose for at least 2 months prior to screening and must agree to take the same dose during the study.

8. Have used a medically acceptable method of contraception for at least 2 months prior to the first dose of study drug and consent to use a medically acceptable method of contraception from the first dose of study drug, throughout the entire study period, and for 90 days after the last dose of study drug.

Exclusion Criteria

1. Hypersomnia due to another medical, behavioral, or psychiatric disorder condition (eg, narcolepsy, depression disorders, multiple sclerosis, Parkinson's disease, stroke).

2. Clinically significant sleep-related breathing disorders, including sleep apnea, treatment with Continuous Positive Airway Pressure (CPAP) therapy, Obstructive Apnea Hypopnea Index (AHI) >15 episodes per hour, or hypoventilation.

3. Clinically significant parasomnias (eg, sleep walking, rapid eye movement [REM] sleep behavior disorder, etc).

4. Periodic Limb Movement Disorder (PLMD) Arousal Index (PLMA-I) >15 during Screening PSG, a historical diagnosis of PLMD (last 10 years), or a PLMD diagnosis older than 10 years with current (last 60 days) treatment or symptoms of rhythmic movements involving one or both legs during sleep.

5. Occupation requiring nighttime shift work or variable shift work with early work start times (before 6 AM), if this occurs more than once per week.

6. Planned travel during the study that includes more than 3 time zones, or planned travel that includes 3 time zones on more than 2 occasions during the study.

7. Going to sleep for the night later than 1 AM at a frequency of more than once per week.

8. Current or past (within 1 year) major depressive episode according to DSM-5 criteria.

9. Any history of attempted suicide (lifetime) or clinically significant suicidal ideation, in the opinion of the Investigator, based on the C-SSRS assessment at Screening.

10. Any clinically significant unstable medical abnormality, chronic disease (eg, asthma or diabetes), or a history of a clinically significant abnormality of the cardiovascular, central nervous system,

11. Any of the following out-of-range vital signs at Screening: systolic blood pressure outside 90-145 mmHg; diastolic blood pressure outside 50-90 mmHg; resting heart rate outside 40-100 beats per minute.

12. History or presence of abnormal ECGs, which in the Investigator's opinion is clinically significant, including the following:

1. ECG findings of ischemia or infarct

2. Complete bundle branch blocks

3. Symptomatic arrhythmias as ventricular arrhythmias (non- sustained ventricular tachycardia (VT), multifocal or frequent premature ventricular contractions), bundle branch block, axis deviation, or abnormal or any predominantly non-sinus- conducted rhythm.

4. QTcF >450 msec for males or >470 msec for females, on Screening ECG.

5. PR interval outside the range of 120 to 220 msec on Screening ECG

13. Estimated glomerular filtration rate (GFR) at Screening <60 mL/min/1.73 m2.

14. Malignant neoplastic disease requiring therapy within 2 years prior to Screening or during the study, or clinically relevant as judged by the Investigator.

15. Uncontrolled thyroid disorder as evidenced by thyroid stimulating hormone (TSH) ≤0.8 x the lower limit of normal (LLN) or ≥1.25 x the upper limit of normal (ULN) for the reference laboratory at Screening.

16. Laboratory value for aspartate aminotransferase (AST) or alanine aminotransferase (ALT) >3 x upper limits of normal (ULN).

17. Excessive caffeine use during the 10 days prior to first dose of study drug or anticipated excessive use defined as >600 mg/day of caffeine during the treatment periods of the study.

18. Treatment or planned treatment with prohibited medications (including medications that may affect daytime sleepiness and nighttime sleep) or unwilling to refrain from any prohibited medications. Treatment must have been discontinued 14 days or 5 half-lives, whichever is longer, prior to the first dose of study medication (and at least 30 days for sedating antidepressants; at least 14 days for CNS stimulants).

19. Current or past (within 12 months prior to Screening) substance use disorder (including alcohol and psychoactive cannabinoids) according to DSM-5 criteria; current or past history of substance abuse treatment (including alcohol), or unwilling to refrain from substance use (including alcohol) during the study.

20. Nicotine dependence that has an effect on sleep (eg, a subject who routinely awakens at night to smoke).

21. Evidence of substance or alcohol use or has a positive urine or breath alcohol or positive urine drug screen at Screening.

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Rho, Inc.

INDUSTRY

Sponsor Role: collaborator

Zevra Therapeutics

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Christopher Drake, PhD

Role: PRINCIPAL_INVESTIGATOR

Investigator

Locations

Sleep Disorders Center Of Alabama

Birmingham, Alabama, United States

Amr Daphne

Daphne, Alabama, United States

Lakeview Clinical Research

Guntersville, Alabama, United States

SOCAL Clinical Research

Huntington Beach, California, United States

Stanford University

Redwood City, California, United States

Sleep Medicine Specialists of California

San Ramon, California, United States

SDS Clinical Trials, Inc

Santa Ana, California, United States

Delta Waves, Inc.

Colorado Springs, Colorado, United States

Saint Francis Sleep Allergy and Lung Institute LLC

Clearwater, Florida, United States

New Generation of Medical Trials

Hialeah, Florida, United States

Angels Clinical Research

Miami, Florida, United States

Ivetmar Medical Group

Miami, Florida, United States

Somnology Research Associates

Miami, Florida, United States

Clinical Trial Services, Corp

Miami, Florida, United States

Pasadena Center for Medical Research

St. Petersburg, Florida, United States

Clinical Site Partners, LLC - Winter Park

Winter Park, Florida, United States

Global Research Associates

Atlanta, Georgia, United States

Neurotrials Research, Inc

Atlanta, Georgia, United States

Clinical Research Institute - Stockbridge

Stockbridge, Georgia, United States

The University of Kansas Medical Center Research Institution Inc.

Kansas City, Kansas, United States

Mid-Atlantic Epilepsy and Sleep Center - Bethesda

Bethesda, Maryland, United States

Neurocare, Inc.

Newton, Massachusetts, United States

Western Michigan University Homer Stryker Md School of Medicine

Kalamazoo, Michigan, United States

Henry Ford Health - Columbus

Novi, Michigan, United States

Clinical Neurophysiology Services PC

Sterling Heights, Michigan, United States

University of Missouri School Of Medicine

Columbia, Missouri, United States

Clayton Sleep Institute, Llc

St Louis, Missouri, United States

Barrett Clinic

La Vista, Nebraska, United States

Global Medical Institutes LLC- Princeton Medical Institute

Lawrence, New Jersey, United States

Clinical Research of Gastonia (CRG)

Gastonia, North Carolina, United States

Intrepid Research

Cincinnati, Ohio, United States

Ohio Sleep Medicine Institute

Dublin, Ohio, United States

Brian Abaluck, LLC

Malvern, Pennsylvania, United States

Thomas Jefferson University

Philadelphia, Pennsylvania, United States

Medical University Of South Carolina (MUSC) - Institute Of Psychiatry (IOP)

Charleston, South Carolina, United States

Bogan Sleep Consultants

Columbia, South Carolina, United States

Futuresearch Trials Of Neurology

Austin, Texas, United States

Dfw Clinical Research Associates

Fort Worth, Texas, United States

Houston Clinical Research Associates

Houston, Texas, United States

Sleep Therapy & Research Center

San Antonio, Texas, United States

TPMG Clinical Research - Williamsburg

Williamsburg, Virginia, United States

Countries

United States

Other Identifiers

KP1077.D01

Identifier Type: -

Identifier Source: org_study_id