An Open-label, Parallel-Group Study to Evaluate the Pharmacokinetics of Lemborexant and Its Metabolites in Subjects With Normal Renal Function or With Severe Renal Impairment
Phase: PHASE1
Conditions: Renal Impairment
Sponsor: Eisai Inc.

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Revision History
Previous Version: v1.0
Current Version: v2.0
Date of Latest Revision:  02 Apr 2018 (revised per Amendment 01)
Change
Rationale
Affected Protocol Section(s)
eGFR will be estimated by
the MDRD only (not also by
creatinine clearance [CLcr]
estimated by the Cockcroft-
Gault equation)
Correction
•
Section 2
•
Study Design
•
Inclusion Criteria
•
Pharmacokinetic Analyses
•
Section 9.5.2.1 (Table 3)
•
Section 9.7.1.7.1
Revised age range for severe 
renal impaired subjects
Correction
•
Section 9.1 (Table 1)
Clarify that the units for the 
MDRD formula (used to 
calculate eGRF) should be 
mL/min/1.73 m2
Correction 
•
Section 2
•
Section 9.3.1
Added Adjudication 
Committee information
Correction
•
Section 2
•
Section 9.2.2
Remove alpha-1-glycoprotein 
(AGP) testing.
Test is not required and was 
included in error. 
•
Section 4
•
Section 9.5.1.5.3 (Table 2)
Add new subheading
For clarity
•
Section 9.2.1
Revised collection period for 
SAEs
Revision to “28 days after last 
visit” is longer than “5 the half-
life”
•
Section 9.5.4.1
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1
TITLE PAGE
CLINICAL STUDY PROTOCOL
Study Protocol 
Number:
E2006-A001-105
Study Protocol 
Title:
An Open-label, Parallel-Group Study to Evaluate the 
Pharmacokinetics of Lemborexant and Its Metabolites in Subjects 
with Normal Renal Function or with Severe Renal Impairment
Sponsor:
Eisai Inc.
100 Tice Boulevard
Woodcliff Lake, 
New Jersey 07677
USA
Investigational 
Product Name:
E2006/Lemborexant
Indication:
Not applicable
Phase:
1
Approval Date:
v1.0
18 Dec 2017 (original protocol)
v2.0
02 Apr 2018 (Amendment 01)
IND Number:
111871
GCP Statement:
This study is to be performed in full compliance with International 
Council 
for
Harmonisation
of 
Technical 
Requirements 
for 
Pharmaceuticals for Human Use (ICH) and all applicable local Good 
Clinical Practice (GCP) and regulations.  All required study 
documentation will be archived as required by regulatory authorities.
Confidentiality 
Statement:
This document is confidential.  It contains proprietary information of 
Eisai (the sponsor).  Any viewing or disclosure of such information 
that is not authorized in writing by the sponsor is strictly prohibited.  
Such information may be used solely for the purpose of reviewing or 
performing this study.
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2
CLINICAL PROTOCOL SYNOPSIS
Compound No.: E2006/Lemborexant
Name of Active Ingredient: (1R,2S)-2-{[(2,4-Dimethylpyrimidin-5-yl)oxy]methyl}-2-(3-fluorophenyl)-N-(5-
fluoropyridin-2-yl)cyclopropanecarboxamide
Study Protocol Title
An Open-label, Parallel-Group Study to Evaluate the Pharmacokinetics of Lemborexant and Its Metabolites in 
Subjects with Normal Renal Function or with Severe Renal Impairment
Investigators
Thomas C. Marbury, MD (Orlando Clinical Research Center)
Kenneth C. Lasseter, MD (Clinical Pharmacology of Miami, LLC., Evolution Research Group)
Sites
Up to 3 sites
Study Period and Phase of Development
The total study duration from the first subject enrolled to the last subject’s last visit/last assessment will be 
approximately 17 weeks. This is a Phase 1 study.
Objectives
Primary Objective
The primary objective is to assess the effect of severe renal impairment on the pharmacokinetics (PK) of 
lemborexant after a single dose administration.
Secondary Objectives
•
To assess the effect of severe renal impairment on the PK of the unbound fraction of lemborexant.
•
To assess the effect of severe renal impairment on the PK of metabolites (M4, M9, and M10) of 
lemborexant.
•
To assess the safety and tolerability of lemborexant in subjects with normal renal function or with severe 
impaired renal function.
Study Design
This is a multicenter, single dose, open-label, parallel-group study in subjects with severe renal impairment 
and matched (with regard to age [± 10 years], race, sex, and body mass index [BMI, ± 20%]) healthy control 
subjects.  The study will be conducted in 2 phases: Prerandomization Phase (containing the Screening Period 
and Baseline Period [Day -1]) and a Treatment Phase. The Screening Period will last up to 20 days, the 
Baseline Period will be 1 day, and the Treatment Period will be 11 days.  Subjects will remain in the clinic 
until approximately 7 days after dosing (will be discharged from clinic after the Day 8 PK blood draw) and 
will return on Day 11 for end-of-study assessments/study discharge. 
Subjects will be assigned to 1 of 2 groups: Subjects with severe renal impairment will be Group 1, and 
subjects with normal renal function demographically matched to subjects with severe impairment will be 
Group 2.  The number of subjects per group and estimated glomerular filtration rate (eGFR) values used to 
assign each subject to a renal function group are shown in the table below.
Synopsis Table 1
Classification of Renal Function Study Groups
Population
eGFRa (mL/min/1.73 m2)
Number of Subjects per Group
Group 1: Severe renal impairment
15 to 29 and not on dialysis
8
Group 2: Normal renal function
≥90
8
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a:  Day -1 estimated glomerular filtration rate (eGFR) will determine the renal category group to which a 
subject is assigned. If the Day -1 eGFR value places the subject into a different renal category group from 
that calculated at screening, the value can be repeated once within 24 to 48 hours.  If eGFR variability 
across these scheduled and repeat time points indicates the subject does not consistently meet the criteria 
for one renal category group, subject enrollment into a renal category group will be at the discretion of the 
Medical Monitor and investigator, in consultation with the sponsor.
The eGFR is determined by the Modification of Diet in Renal Disease (MDRD) formula: (revised per 
Amendment 01)
eGFR (mL/min/1.73m2) = 175 x (serum creatinine)-1.154 x (age)-0.203 x (0.742 if female) x 
(1.212 if African American)
Group 1 subjects (severe renal impairment) will be enrolled first.  Group 2 subjects (normal renal function) 
will be matched according to age, race, sex, and BMI.
Subjects determined eligible for study participation will receive a single 10 mg oral dose of lemborexant on 
Day 1.  During the Treatment Period, plasma will be obtained over 11 days for the determination of 
lemborexant and metabolite concentrations M4, M9 and M10.  Standard safety assessments will be measured 
before, during, and at the conclusion of the study. 
Adjudication Committee (revised per Amendment 01)
An independent Adjudication Committee will be employed at intervals to review, in a blinded manner, AEs that 
could potentially be considered cataplexy or seizure. A set of preferred terms constituting a customized Medical 
Dictionary for Regulatory Activities (MedDRA) query for cataplexy or seizure will be used to identify events 
for adjudication (including cataplexy, muscle fatigue, muscular weakness, muscle tone disorder, hypotonia, 
drop attacks, slurred speech, diplopia, falls, convulsions [standardized MedDRA query (SMQ) narrow and 
broad], atypical migraine, loss of consciousness, decreased consciousness, myoclonus, syncope, transient global 
amnesia, lipothymia, [faintness] and transient ischemic attack). To assist in the preparation of narratives about 
such events and to support the committee’s adjudication process, investigators and site staff will be instructed to 
query subjects who report any of the above events for supplemental information using a questionnaire for events 
potentially related to cataplexy and the serious adverse event (SAE) form for any of the above events considered 
serious.
Number of Subjects
A total of at least 16 subjects will be enrolled in each of the following 2 cohorts:
Group 1:  8 subjects with severe renal impairment
Group 2:  At least 8 healthy subjects (control) matched to subjects in Group 1
Inclusion Criteria
Inclusion Criteria for All Subjects
Subjects who meet all of the following inclusion criteria will be eligible for participation in the study.
1.
Male or female subjects, ages 18 to 79, inclusive, at the time of informed consent.
2.
Body Mass Index (BMI) between 18 and 40 kg/m2, inclusive, at Screening.
3.
Voluntary agreement to provide written informed consent, and the willingness and ability to comply 
with all aspects of the protocol.
4.
Nonsmokers or smokers who smoke 20 cigarettes or less per day. 
5.
Subjects with normal liver function.
Additional Inclusion Criteria for Healthy Subjects:
In addition to the Inclusion Criteria for All subjects, the following inclusion criterion will also be applied for 
healthy subjects with normal renal function:
6.
eGFR is ≥ 90 mL/min/1.73 m2, as determined by the MDRD formula (revised per Amendment 01).
Additional Inclusion Criteria for Subjects With Renal Impairment: 
In addition to the Inclusion Criteria for All subjects, the following additional inclusion criteria will be applied
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for subjects with renal impairment:
7.
Diagnosis of severe renal impairment (eGFR is 15-29 mL/min/1.73 m2, as determined by the MDRD 
formula) that has been stable (without any change in disease status) for at least 60 days prior to study 
screening and is confirmed on Day -1, as determined by the investigator by MDRD formula. If the 
renal function classification for the subject changed from screening to Day -1, eGFR should be
repeated once within 24 to 48 hours.  If eGFR variability across these scheduled and repeat time 
points indicates the subject does not consistently meet the criteria for one renal category group, 
subject enrollment into a renal category group will be at the discretion of the medical monitor and 
investigator, in consultation with the Sponsor (revised per Amendment 01). 
Exclusion Criteria
Exclusion Criteria for All Subjects
1.
Females who are breastfeeding or pregnant at Screening or Baseline (as documented by a positive 
beta-human chorionic gonadotropin [ß-hCG] test with a minimum sensitivity of 25 IU/L or equivalent 
units of ß-hCG).  A separate baseline assessment is required if a negative screening pregnancy test 
was obtained more than 72 hours before the dose of study drug.
2.
Females of childbearing potential who did not use a highly effective method of contraception (as 
described below) within 28 days before study entry, or who do not agree to use an approved method 
of contraception from 28 days before study entry, throughout the entire study period, and for 28 days 
after study drug discontinuation.  Approved (highly effective) methods of contraception for this study 
include at least one of the following:
•
Total abstinence (if it is their preferred and usual lifestyle)
•
An intrauterine device or intrauterine hormone-releasing system (IUS)
•
A double-barrier method of contraception such as condom plus diaphragm with spermicide
•
A contraceptive implant
•
An oral contraceptive (with additional barrier method). Subject must be on a stable dose of the 
same oral contraceptive product for at least 28 days before dosing and throughout the study and 
for 28 days after study drug discontinuation.
•
Have a vasectomized partner with confirmed azoospermia.
(NOTE: All females will be considered to be of childbearing potential unless they are 
postmenopausal [amenorrheic for at least 12 consecutive months, in the appropriate age group, and 
without other known or suspected cause] or have been sterilized surgically [ie, bilateral tubal ligation, 
total hysterectomy, or bilateral oophorectomy, all with surgery at least 1 month before dosing]).
3.
Intake of food supplements (including herbal preparations), foods or beverages that may affect 
CYP3A4 enzyme (eg, alcohol, grapefruit, grapefruit juice, grapefruit-containing beverages, apple or 
orange juice, vegetables from the mustard green family [eg, kale, broccoli, watercress, collard greens, 
kohlrabi, Brussels sprouts, mustard] and charbroiled meats) within 2 weeks before dosing until study 
discharge.
4.
Use of an herbal preparation containing St. John’s Wort within 4 weeks before dosing until study 
discharge.
5.
Known to be positive for human immunodeficiency virus (HIV).
6.
Presence of acute and active liver disease, or acute liver injury, as indicated by (1) an abnormal liver 
function test, or (2) clinical or laboratory signs of acute, active viral hepatitis (including B and C as 
demonstrated by positive serology at Screening).  Subjects with stable, chronic, inactive viral 
hepatitis B or C may be enrolled based on investigator’s opinion.
7.
QTcF interval > 480, QT interval corrected for heart rate (QTc) by Fridericia’s formula (QTcF) msec 
on electrocardiograms (ECGs) at Screening or Day -1.  Before excluding a subject with QTcF > 480 
at Screening, ECG should be repeated once to confirm.
8.
A known or suspected history of drug or alcohol abuse disorder within 6 months prior to Screening.
9.
A positive urine drug test or a positive breathalyzer alcohol test at Screening or Day -1.
10. Participation in another interventional clinical trial within 4 weeks, or 5 times the half-life of the 
investigational drug (whichever is longer), of lemborexant administration. 
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11. Engaged in heavy/strenuous physical exercise within 2 weeks prior to check-in on Day -1 (eg, 
marathon runners, weight lifters).
12. Unwilling to abide by the study requirements, or in the opinion of the investigator, is not likely to 
complete the study.
13. History of clinically significant drug or food allergies, or is presently experiencing significant 
seasonal allergies.
14. Recent weight change that is considered clinically significant by the Investigator.
15. Clinically significant findings revealed by physical examination, assessment of vital signs, ECG, or 
clinical laboratory testing.
16. Use of any prohibited prescription or over-the-counter (OTC) medication within 2 weeks or 5 half-
lives (whichever is longer) before Screening, or plans to use any such treatment during the study.  For 
subjects with renal impairment, chronic stable administration of medications necessary for 
maintaining the clinical status of the subject may be permitted after consultation with the Medical 
Monitor.
Additional Exclusion Criteria for Healthy Subjects:
In addition to the Exclusion Criteria above for All Subjects, other standard exclusion criteria for healthy 
subjects in Phase 1 studies will be used. These include:
17. Presence of clinically significant illness requiring treatment or that may influence the outcome of the 
study (eg psychiatric disorders, disorders of the gastrointestinal tract, liver, kidney, respiratory 
system, endocrine system, hematological system, neurological system, or cardiovascular system), a 
history of myocardial infraction, or a congenital abnormality.
18. Receipt or donation of blood or blood products within 4 to 8 weeks prior to study drug 
administration.
Additional Exclusion Criteria for Subjects With Renal Impairment:
In addition to the Exclusion Criteria for All Subjects, other exclusion criteria for subjects with renal 
impairment will include:
19. Any history of renal transplant.
20. Any known significant bleeding diathesis (for example, history of recent bleeding from esophageal 
varices), which could preclude multiple venipuncture or deep intramuscular injections.
21. New significant illness that onset within 2 weeks prior to study drug administration.
22. Current clinically relevant disease other than the renal impairment (eg, cardiac, hepatic, 
gastrointestinal disorder, or a condition which may impact drug absorption), as determined by the 
investigator.  Subjects with a history of Type I or Type II diabetes may be eligible, providing that, in 
the investigator’s opinion, the disease has been stable.  Subjects receiving insulin therapy may be 
eligible provided they have been on a stable (ie, dose has not changed) treatment for at least 2 weeks 
prior to study enrollment and will continue the treatment throughout the study.
Study Treatment
Test drug: Lemborexant (E2006)
All subjects enrolled in the study will receive a single 10 mg dose (1 × 10 mg lemborexant tablet)
Comparator Drug: Not applicable.
Duration of Treatment
The study duration per subject will be as follows:
Prerandomization Phase: Up to 21 days
Treatment Phase: 11 days
Concomitant Drug/Therapy/ Lifestyle Restrictions
For all subjects enrolled in the study, any medication or therapy administered during the study will be 
recorded.  In addition, intake of the following supplements are prohibited for all subjects during the study:

Smokers must not smoke more than 20 cigarettes per day.

Intake of food supplements (including herbal preparations), foods or beverages that may affect CYP3A4 
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enzyme (eg, alcohol, grapefruit, grapefruit juice, grapefruit-containing beverages, apple or orange juice, 
vegetables from the mustard green family [eg, kale, broccoli, watercress, collard greens, kohlrabi, 
Brussels sprouts, mustard] and charbroiled meats) within 2 weeks before dosing until study discharge.

Intake of beverages, food, or other products that contain caffeine from 24 hours before until 48 hours after 
dosing with lemborexant. 

Herbal preparations containing St. John’s Wort within 4 weeks before dosing until study discharge.

Engagement in strenuous exercise is prohibited within 2 weeks before check-in on Day -1 and until study 
discharge.
For healthy subjects, use of prescription or over-the-counter (OTC) medications is prohibited within 2 weeks 
or 5 half-lives (whichever is longer) before Screening and until discharge from the study.  For subjects with 
renal impairment, chronic stable administration of medications necessary for maintaining the clinical status of 
the subject may be permitted if approved by Medical Monitor.  Any concomitant therapies must be recorded 
on the CRF.  Concomitant medication may not be administered 4 hours before or after study drug 
administration on Day 1.  
See the Appendix to this protocol for a full list of prohibited concomitant medications.
Assessments
Efficacy Assessments
Not applicable.
Pharmacokinetic Assessments
Blood samples (4 mL each) for PK assessments of lemborexant and its metabolites (M4, M9, and M10) will be 
collected at predose (0 hour), 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 36, 48, 72, 96, 120, 144, 168 and 240 hours 
postdose.  In addition, blood samples for protein binding (12 mL per time point) of lemborexant will be 
collected at 1 and 24 hours postdose matching the PK sample collection at those time points.
Safety Assessments
Safety will be assessed by monitoring and documenting adverse events (AEs), ECGs, vital signs, physical 
examinations, and clinical laboratory tests (urinalysis, hematology, and blood chemistry).
Bioanalytical Methods
Total plasma concentrations of lemborexant and its metabolites (M4, M9, and M10) will be measured by 
validated liquid chromatography with tandem mass spectrometry (LC-MS/MS) methods.  The unbound 
concentrations of lemborexant will also be measured using a similar validated LC-MS/MS method following
equilibrium dialysis.
Statistical Methods
Study Endpoints
The endpoints include the following PK parameters derived by non-compartmental analysis using the plasma 
concentration-time data of lemborexant and its metabolites:
Cmax
Maximum drug concentration
tmax
Time to reach maximum drug concentration
AUC(0-t)
Area under plasma concentration vs. time curve from time = 0 to time of last 
quantifiable concentration 
AUC(0-inf)
Area under plasma concentration vs. time curve from time = 0 to infinity
t1/2
Terminal phase plasma half-life
CL/F
Apparent total body clearance ( for lemborexant only)
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Vz/F
Apparent volume of distribution (for lemborexant only)
AUC Metabolite 
Ratio
Ratio of AUC(0-inf) of individual metabolite to AUC(0-inf) of lemborexant, corrected for 
molecular weights
fu
Plasma protein unbound fraction
AUCu
AUC(0-inf) values adjusted by unbound fraction in plasma (for lemborexant only)
CLu/F
Apparent clearance relative to the unbound plasma concentration based on AUCu 
(for lemborexant only)
The Cmax, AUC(0-t), and AUC(0-inf) of lemborexant will be the primary PK endpoints.  The rest of the 
parameters, including the PK parameters of the metabolites, will be secondary endpoints.
Analysis Sets
The Safety Analysis Set is the group of subjects who dosed with the test drug and had at least 1 postdose 
safety assessment.
The Pharmacokinetic Analysis Set is the group of subjects who had sufficient PK data to derive at least 1 PK 
parameter.
Efficacy Analyses
Not applicable.
Pharmacokinetic, Pharmacodynamic, Pharmacogenomic, and Other Biomarker Analyses
Pharmacokinetic Analyses
The Safety Analysis Set will be used for individual plasma concentration listings.  The PK Analysis Set will 
be used for summaries of plasma concentrations and for analyses, summaries, and listings of PK parameters.
The effect of renal impairment on the PK of lemborexant will be assessed using a linear model with renal 
impairment group as a factor.  Logarithmically transformed values of the primary PK parameters Cmax, 
AUC(0-t), and AUC(0-inf) will be utilized to estimate the geometric mean ratio (and two-sided 90% confidence 
intervals) of subjects with severe renal impairment versus subjects with normal renal function.  Similar 
statistical analyses will be conducted for the PK parameters of the metabolites and unbound lemborexant. 
Protein binding will be measured for metabolites without any derivation of PK parameters.  In addition, 
summary statistics for PK parameters in each renal function group will be tabulated.
If the 90% confidence intervals indicate that there is an effect of renal impairment on the primary PK 
parameters, relationships between the individual subject PK parameters (Cmax, AUC(0-t), AUC(0-inf), and CL/F, 
both free and total) and individual subject estimated renal function (eGFR estimated by the MDRD) will be 
explored utilizing linear regression models with log-transformed PK parameters as the dependent variable and 
estimated renal function as the independent variable (revised per Amendment 01).  Point estimates and 95% 
CIs of the intercept and slope will be presented.  The relationship between each of the PK parameters and the 
estimated renal function will be also presented graphically.
Safety Analyses
An evaluation of safety will be performed on the Safety Analysis Set.  Safety data that will be evaluated 
include AEs, clinical laboratory results, vital signs, and ECGs.
Treatment-emergent adverse events (TEAEs) will be summarized for each group.  Descriptive summary 
statistics (eg, mean, standard deviation [SD], median, minimum, maximum for continuous variables, and 
number and percentage for categorical variables) including shift tables of the laboratory and vital signs data.  
Changes from baseline for the clinical laboratory, vital signs, and ECG parameters will be evaluated for 
subjects with renal impairment and healthy controls by time point.
Interim Analyses
Not applicable. 
Sample Size Rationale
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A sample size of 8 subjects for each cohort is based on the recommendations in the FDA Guidance on 
Pharmacokinetics in Patients with Renal Impairment, and should provide estimates to assess whether dose 
adjustment is required for subjects with renal impairment. 
Based on data from single dose studies of the 10 mg tablet (E2006-A001-004, E2006-A001-005, and 
E2006-A001-008), the pooled between-subject standard deviation of logarithmically transformed AUC(0-inf)
values of  lemborexant is 0.391.  With a sample size of 8 subjects with severe renal impairment and 8 matched 
controls and 8 matched controls, the 2-sided 90% confidence interval (CI) for the geometric mean ratio for 
AUC(0-inf) would extend from 0.72 to 1.38 (for a mean ratio of 1.0).  Similar precision is expected for the 
2-sided 90% CI for the ratio for AUC(0-t).
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3
TABLE OF CONTENTS
1
TITLE PAGE.....................................................................................................................2
2
CLINICAL PROTOCOL SYNOPSIS...............................................................................3
3
TABLE OF CONTENTS.................................................................................................10
4
LIST OF ABBREVIATIONS AND DEFINITIONS OF TERMS..................................14
5
ETHICS............................................................................................................................16
5.1
Institutional Review Boards/Independent Ethics Committees ..............................16
5.2
Ethical Conduct of the Study.................................................................................16
5.3
Subject Information and Informed Consent...........................................................17
6
INVESTIGATORS AND STUDY PERSONNEL..........................................................17
7
INTRODUCTION ...........................................................................................................17
7.1
Indication ...............................................................................................................17
7.1.1
Lemborexant ................................................................................................18
7.1.1.1
Therapeutic Pathway............................................................................18
7.1.1.2
Clinical Experience With Lemborexant...............................................18
7.2
Study Rationale......................................................................................................19
8
STUDY OBJECTIVES....................................................................................................20
8.1
Primary Objective..................................................................................................20
8.2
Secondary Objectives.............................................................................................20
9
INVESTIGATIONAL PLAN..........................................................................................20
9.1
Overall Study Design and Plan..............................................................................20
9.1.1
Prerandomization Phase...............................................................................21
9.1.1.1
Screening Period..................................................................................21
9.1.1.2
Baseline Period ....................................................................................21
9.1.2
Treatment Phase...........................................................................................22
9.2
Discussion of Study Design, Including Choice of Control Groups.......................22
9.2.1
Study Design................................................................................................22
9.2.2
Adjudication Committee (revised per Amendment 01)...............................22
9.3
Selection of Study Population................................................................................22
9.3.1
Inclusion Criteria .........................................................................................23
9.3.2
Exclusion Criteria ........................................................................................23
9.4
Treatments..............................................................................................................26
9.4.1
Treatments Administered.............................................................................26
9.4.2
Identity of Investigational Product...............................................................26
9.4.2.1
Chemical Name, Structural Formula of E2006....................................27
9.4.2.2
Comparator Drug .................................................................................27
9.4.2.3
Labeling for Study Drug......................................................................27
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9.4.2.4
Storage Conditions...............................................................................27
9.4.3
Method of Assigning Subjects to Treatment Groups...................................27
9.4.4
Selection of Doses in the Study...................................................................27
9.4.5
Selection and Timing of Dose for Each Subject..........................................27
9.4.6
Blinding........................................................................................................28
9.4.7
Prior and Concomitant Therapy...................................................................28
9.4.8
Prohibitions and Restrictions during Study Period......................................29
9.4.8.1
Food and Water....................................................................................29
9.4.8.2
Beverage and Other Restrictions .........................................................29
9.4.8.3
Physical Activity Restrictions..............................................................29
9.4.9
Treatment Compliance.................................................................................30
9.4.10
Drug Supplies and Accountability...............................................................30
9.5
Study Assessments.................................................................................................31
9.5.1
Assessments.................................................................................................31
9.5.1.1
Demography.........................................................................................31
9.5.1.2
Baseline Assessments ..........................................................................32
9.5.1.2.1
Medical History .............................................................................32
9.5.1.2.2
Height and Weight Measurements.................................................32
9.5.1.3
Efficacy Assessments...........................................................................32
9.5.1.4
Pharmacokinetic, Pharmacodynamic, Pharmacogenomic, and 
Other Biomarker Assessments.............................................................32
9.5.1.4.1
Pharmacokinetic Assessments .......................................................32
9.5.1.4.2
Pharmacodynamic, Pharmacogenomic, and Other Biomarker 
Assessments...................................................................................32
9.5.1.5
Safety Assessments..............................................................................32
9.5.1.5.1
Adverse Events ..............................................................................33
9.5.1.5.2
Serious Adverse Events and Events Associated with Special 
Situations........................................................................................34
9.5.1.5.3
Laboratory Measurements .............................................................35
9.5.1.5.4
Vital Signs and Weight Measurements..........................................36
9.5.1.5.5
Physical Examinations...................................................................37
9.5.1.5.6
Electrocardiograms ........................................................................37
9.5.1.5.7
Viral Tests......................................................................................37
9.5.1.5.8
Pregnancy Test...............................................................................37
9.5.1.5.9
Urine Drug Test .............................................................................37
9.5.1.5.10
Breath Alcohol Test .......................................................................38
9.5.2
Schedule of Procedures/Assessments ..........................................................38
9.5.2.1
Schedule of Procedures/Assessments ..................................................38
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9.5.2.2
Total Volume of Blood Sampling........................................................41
9.5.3
Appropriateness of Measurements...............................................................42
9.5.4
Reporting of Serious Adverse Events, Pregnancy, and Events 
Associated with Special Situations..............................................................42
9.5.4.1
Reporting of Serious Adverse Events..................................................42
9.5.4.2
Reporting of Pregnancy and Exposure to Study Drug Through 
Breastfeeding .......................................................................................43
9.5.4.3
Reporting of Events Association with Special Situations....................43
9.5.4.3.1
Reporting of Adverse Events Associated With Study Drug 
Overdose, Misuse, Abuse, or Medication Error ............................43
9.5.4.4
Expedited Reporting ............................................................................44
9.5.4.5
Breaking the Blind...............................................................................44
9.5.4.6
Regulatory Reporting of Adverse Events ............................................44
9.5.5
Completion/Discontinuation of Subjects.....................................................44
9.5.6
Confirmation of Medical Care by Another Physician (for Renal 
Impairment Subjects):..................................................................................45
9.6
Data Quality Assurance .........................................................................................45
9.6.1
Data Collection ............................................................................................45
9.6.2
Clinical Data Management ..........................................................................45
9.7
Statistical Methods.................................................................................................45
9.7.1
Statistical and Analytical Plans....................................................................46
9.7.1.1
Study Endpoints...................................................................................46
9.7.1.2
Definitions of Analysis Sets.................................................................46
9.7.1.3
Subject Disposition..............................................................................47
9.7.1.4
Demographic and Other Baseline Characteristics ...............................47
9.7.1.5
Prior and Concomitant Therapy...........................................................47
9.7.1.6
Efficacy Analyses ................................................................................47
9.7.1.7
Pharmacokinetic, Pharmacodynamic, Pharmacogenomic, and 
Other Biomarker Analyses...................................................................47
9.7.1.7.1
Pharmacokinetic Analyses.............................................................47
9.7.1.7.2
Pharmacodynamic, Pharmacogenomic, and Other Biomarker 
Analyses.........................................................................................48
9.7.1.8
Safety Analyses....................................................................................48
9.7.1.8.1
Extent of Exposure.........................................................................48
9.7.1.8.2
Adverse Events ..............................................................................48
9.7.1.8.3
Laboratory Values..........................................................................49
9.7.1.8.4
Vital Signs......................................................................................49
9.7.1.8.5
Electrocardiograms ........................................................................49
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9.7.2
Determination of Sample Size .....................................................................49
9.7.3
Interim Analysis...........................................................................................50
9.7.4
Other Statistical/Analytical Issues ...............................................................50
9.7.5
Procedure for Revising the Statistical Analysis Plan...................................50
10
REFERENCE LIST .........................................................................................................51
11
PROCEDURES AND INSTRUCTIONS (ADMINISTRATIVE PROCEDURES).......52
11.1
Adherence to the Protocol......................................................................................52
11.2
Monitoring Procedures...........................................................................................52
11.3
Recording of Data..................................................................................................53
11.4
Identification of Source Data.................................................................................53
11.5
Retention of Records..............................................................................................53
11.6
Auditing Procedures and Inspection......................................................................54
11.7
Handling of Study Drug.........................................................................................54
11.8
Publication of Results ............................................................................................54
11.9
Disclosure and Confidentiality ..............................................................................54
11.10 Discontinuation of Study .......................................................................................55
11.11 Subject Insurance and Indemnity...........................................................................55
12
APPENDICES .................................................................................................................56
LIST OF IN-TEXT TABLES
Table 1
Classification of Renal Function Study Groups.........................................21
Table 2
Clinical Laboratory Tests...........................................................................36
Table 3
Schedule of Procedures / Assessments in Study E2006-A001-105..........39
Table 4
Blood Sampling Schedule for Pharmacokinetic Assessments...................41
Table 5
Summary of Blood Sample Volumes ........................................................41
LIST OF APPENDICES
Appendix 1
Sponsor’s Grading for Laboratory Values.................................................57
Appendix 2
List of Prohibited Concomitant Medications.............................................59
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4
LIST OF ABBREVIATIONS AND DEFINITIONS OF TERMS
Abbreviation
Term (revised per Amendment 01)
AE
adverse event
AUC
area under plasma concentration vs. time curve
AUC(0-96h)
area under the concentration vs. time curve from time = 0 to 96 hours postdose 
AUC(0-t)
Area under plasma concentration vs. time curve from time = 0 
to time of last quantifiable concentration 
AUCinf
Area under plasma concentration vs. time curve from time = 0 
to infinity
AUCu
AUC(0-inf) values adjusted by unbound fraction in plasma 
BA
bioavailability
β-hCG
beta-human chorionic gonadotropin
BMI
body mass index
BP
blood pressure
BUN
blood urea nitrogen
CA
competent authority
CFR
Code of Federal Regulations
CI
confidence interval
CLcr
creatinine clearance
CLIA
Clinical Laboratory Improvement Amendments
CLu/F
Apparent clearance relative to the unbound plasma concentration 
based on AUCu 
Cmax
maximum drug concentration
CRA
clinical research associate
CRF
case report form
CRO
clinical research organization
CSR
clinical study report
CYP
cytochrome P450
DORA
dual orexin receptor antagonist 
ECG
electrocardiogram
EDTA
ethylenediaminetetraacetic acid
eGFR
estimated glomerular filtration rate 
EMA
European Medicines Agency
EOS
end-of-study
ESRD
end stage renal disease 
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FDA
Food and Drug Administration
fu
Plasma protein unbound fraction
GCP
Good Clinical Practice
HBsAg
hepatitis B surface antigen 
HCVAb
hepatitis C antibody
ICF
informed consent form
ICH
International Council for Harmonisation of Technical Requirements for 
Pharmaceuticals for Human Use
IEC
independent ethics committee
IRB
institutional review board
ISWRD
Irregular Sleep-Wake Rhythm Disorder 
K
+
potassium
LC-MS-MS
liquid chromatography with tandem mass spectrometry
LLT
lower level term
LNH
low-normal-high
MDRD
Modification of Diet in Renal Disease 
MedDRA
Medical Dictionary for Regulatory Activities
MHRA
Medicines and Healthcare products Regulatory Agency
Na+
sodium
OTC
over-the-counter
PT
preferred term
RBC
red blood cell
SAD
single ascending dose 
SAE
serious adverse event
SD
standard deviation
SOC
system organ class
SOP
standard operating procedure
t1/2
terminal phase plasma half-life
TEAE
treatment-emergent adverse event
Tmax
time to reach maximum drug concentration
US
United States
Vz/F
Apparent volume of distribution
WBC
white blood cell 
WCT
Worldwide Clinical Trials
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5
ETHICS
5.1
Institutional Review Boards/Independent Ethics Committees
The protocol, informed consent form (ICF), and appropriate related documents must be 
reviewed and approved by an Institutional Review Board (IRB) or Independent Ethics 
Committee (IEC) constituted and functioning in accordance with International Council for
Harmonisation of Technical Requirements of Pharmaceuticals for Human Use (ICH) E6 
(Good Clinical Practice), Section 3, and any local regulations.  Any protocol amendment or 
revision to the ICF will be resubmitted to the IRB/IEC for review and approval, except for 
changes involving only logistical or administrative aspects of the study (eg, change in clinical 
research associate [CRA], change of telephone number[s]).  Documentation of IRB/IEC 
compliance with the ICH E6 and any local regulations regarding constitution and review 
conduct will be provided to the sponsor.
A signed letter of study approval from the IRB/IEC chairman must be sent to the principal 
investigator with a copy to the sponsor before study start and the release of any study drug to 
the site by the sponsor or its designee (ICH E6, Section 4.4).  If the IRB/IEC decides to 
suspend or terminate the study, the investigator will immediately send the notice of study 
suspension or termination by the IRB/IEC to the sponsor.
Study progress is to be reported to IRB/IECs annually (or as required) by the investigator or 
sponsor, depending on local regulatory obligations.  If the investigator is required to report to 
the IRB/IEC, he/she will forward a copy to the sponsor at the time of each periodic report.  
The investigator(s) or the sponsor will submit, depending on local regulations, periodic 
reports and inform the IRB/IEC of any reportable adverse events (AEs) per ICH guidelines 
and local IRB/IEC standards of practice.  Upon completion of the study, the investigator will 
provide the IRB/IEC with a brief report of the outcome of the study, if required.
In the case of early termination/temporary halt of the study, the investigator should notify the 
IRB/IEC and competent authority (CA) within 15 calendar days, and a detailed written 
explanation of the reasons for the termination/halt should be given.
5.2
Ethical Conduct of the Study
This study will be conducted in accordance with standard operating procedures of the 
sponsor (or designee), which are designed to ensure adherence to GCP guidelines as required 
by the following:
•
Principles of the World Medical Association Declaration of Helsinki revised version 
Fortaleza 2013)
•
ICH E6 Guideline for GCP (CPMP/ICH/135/95) of the European Agency for the 
Evaluation of Medicinal Products, Committee for Proprietary Medicinal Products, 
International Council for Harmonisation of Technical Requirements for Pharmaceuticals 
for Human Use
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•
Title 21 of the United States Code of Federal Regulations (US 21 CFR) regarding clinical 
studies, including Part 50 and Part 56 concerning informed subject consent and IRB 
regulations and applicable sections of US 21 CFR Part 312
5.3
Subject Information and Informed Consent
As part of administering the informed consent document, the investigator or designee must 
explain to each subject the nature of the study, its purpose, the procedures involved, the 
expected duration, the potential risks and benefits involved, any potential discomfort, 
potential alternative procedure(s) or course(s) of treatment available to the subject, and the 
extent of maintaining confidentiality of the subject’s records.  Each subject must be informed 
that participation in the study is voluntary, that he/she may withdraw from the study at any 
time, and that withdrawal of consent will not affect his/her subsequent medical treatment or 
relationship with the treating physician.
This informed consent should be given by means of a standard written statement, written in 
nontechnical language.  The subject should understand the statement before signing and 
dating it and will be given a copy of the signed document.  If a subject is unable to read, an 
impartial witness should be present during the entire informed consent discussion.  After the 
ICF and any other written information to be provided to subjects is read and explained to the 
subject, and after the subject has orally consented to the subject’s participation in the study 
and, if capable of doing so, has signed and personally dated the ICF, the witness should sign 
and personally date the consent form.  The subject will be asked to sign an ICF at the 
Screening visit before any study-specific procedures are performed.  No subject can enter the 
study before his/her informed consent has been obtained.
An unsigned copy of an IRB/IEC-approved ICF must be prepared in accordance with ICH 
E6, Section 4, and all applicable local regulations (eg, Federal Regulations, Title 21 CFR 
Part 50).  Each subject must sign an approved ICF before study participation.  The form must 
be signed and dated by the appropriate parties.  The original, signed ICF for each subject will 
be verified by the sponsor and kept on file according to local procedures at the site.
6
INVESTIGATORS AND STUDY PERSONNEL
This study will be conducted by qualified investigators under the sponsorship of Eisai (the 
sponsor) at up to three investigational sites in the United States (US).
The name and telephone and fax numbers of the medical monitor and other contact personnel 
at the sponsor are provided to the sites.
7
INTRODUCTION
7.1
Indication
Lemborexant (E2006) is part of the dual orexin receptor antagonist (DORA) class of drugs,
and it is being developed as a treatment for insomnia disorder and for Irregular Sleep-Wake 
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Rhythm Disorder (ISWRD).  Phase 1 and 2 studies in the lemborexant clinical program have 
provided evidence of efficacy at safe and well-tolerated doses. 
7.1.1
Lemborexant
The proposed study is an open-label, parallel-group study to evaluate the PK of lemborexant 
and its metabolites in subjects with normal renal function or with severe renal impairment.
7.1.1.1
Therapeutic Pathway
Lemborexant (E2006), a dual orexin receptor antagonist, is an Eisai in-house discovered and 
developed small molecule which inhibits orexin by binding competitively to two subtypes of 
orexin receptors (orexin receptor 1 and 2). In individuals with insomnia, it is possible that the 
orexin system, which regulates sleep and wakefulness, is not functioning normally. During 
normal periods of sleep, orexin system activity is suppressed, suggesting it is possible to 
purposefully counteract inappropriate wakefulness and facilitate the initiation and 
maintenance of sleep by interfering with orexin neurotransmission. 
7.1.1.2
Clinical Experience With Lemborexant
To date, a total of 9 Phase 1 studies have been completed, with healthy subjects treated with 
either single or multiple once daily doses for 14 days, and subjects with insomnia disorder 
who were administered single doses of lemborexant.  In addition, a Phase 2 dose-finding 
study in adult and elderly subjects with insomnia disorder demonstrated efficacy and safety 
over a dose range from 1 mg to 25 mg to enable lemborexant to proceed into Phase 3 studies.  
Relevant to the currently proposed study, the tolerability data from the first human study 
suggest that single doses up to 200 mg have been generally well tolerated in healthy adult 
subjects.
Following single oral dose administration, lemborexant generally exhibited linear PK within 
the dose range studied (1 mg to 200 mg), but at doses of 50 mg and above, the increase in the 
maximum drug concentration (Cmax) was less than dose proportional.  Lemborexant exhibits 
approximate dose proportional (based on Cmax and the area under the plasma concentration 
versus time curve [AUC]) PK at steady state on Day 14 following multiple dose 
administrations between 2.5 mg and 75 mg of lemborexant administered once daily.  Oral 
absorption of lemborexant was rapid with peak plasma concentration around 1 to 3 hours 
postdose. 
The terminal half-life was ~45 to 55 hours over a comparable dose range 
following single and multiple dose administration of lemborexant.  Accumulation of 
lemborexant following multiple dosing was lower than predicted by terminal half-life, with 
mean Cmax ranging from 1.21 to 2.39 and an area under the concentration-time curve from 
zero time to 96 hours postdose (AUC[0-96h]) of 1.67 to 3.26 over the dose range.  Based on the 
overall accumulation, the effective half-life of lemborexant ranged from 16.9 to 39.3 hours
over the dose range.  Exposure (AUC(0-96h)) of the main metabolites relative to lemborexant 
was 19.9% to 57.5% following multiple dosing at 25 mg for 14 days. Additionally the 
lemborexant plasma concentration-time profiles were similar between healthy volunteers 
administered lemborexant in the morning compared to otherwise healthy subjects with 
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primary insomnia administered lemborexant in the evening, suggesting that the time of 
dosing does not affect the PK. Mean plasma protein binding evaluated is 88.8% across the 
concentrations studied and exhibited no appreciable concentration dependence.
Results from the radiolabeled 14C-human mass balance study indicate that E2006 is 
extensively metabolized since less than 13% of the administered dose was recovered 
unchanged in feces only; urinary excretion of unchanged E2006 was negligible.  The 
proposed metabolic pathways of E2006 involve primarily oxidation of dimethylpyrimidine 
moiety of E2006 to the M4, M9, and M10 metabolites. Less than 2% of the drug was 
excreted unchanged in the single ascending dose study.
7.2
Study Rationale
This study is designed to evaluate the PK of lemborexant in subjects with renal impairment, 
since a subset of the target population in insomnia may have some degree of renal 
impairment and presence of comorbidities.  Subjects with impaired renal function may 
display altered PK because of inhibition of this and other pathways including hepatic and gut 
metabolism and transport, even if the drug is not predominantly eliminated via the renal 
pathway. 
Pharmacokinetic studies in patients with impaired renal function are recommended by global 
regulatory agencies for investigational products that are intended for chronic use and are 
substantially eliminated renally (ie, if the fraction of dose excreted unchanged in the urine is 
at least 30%). Renal impairment studies are also recommended for investigational products 
which are detected in the bile, as renal impairment can inhibit some pathways of hepatic and 
gut drug metabolism and transport.  The standard or full design of renal function studies is to 
include subjects with varying degrees of renal impairment, including mild, moderate and 
severe impairment, with corresponding matched healthy subjects.  If renal elimination 
(excretion and renal metabolism) is a minor route of elimination of the drug, then a reduced 
study design which includes only severe impairment and matched healthy subjects is 
warranted for consideration.
Lemborexant is eliminated to a minor extent in the urine. The data from single ascending 
dose (SAD) studies show urinary clearance component is negligible (≤2.6%).  Additionally, 
data from a human mass balance study supports that renal elimination is a minor pathway, as
only 26% of the total dose-related radioactivity was recovered in urine.  None of the 
metabolites exceed 5% of the total administered dose eliminated in the urine.  Overall, these 
results indicate that a full PK study design as outlined by United States Food and Drug 
Administration (FDA) and the European Medicines Agency (EMA) guidances (FDA, 2010; 
EMA, 2004) on studies with subjects with renal impairment is not warranted, and a reduced 
design can be applied. 
Therefore, the proposed study will assess the effect of lemborexant only in subjects with 
severe renal function and demographically matched healthy subjects.  Ongoing Phase 3 
studies allow inclusion of moderate and mild subjects with renal impairment.  This study will 
not examine the effect of end stage renal disease (ESRD) on lemborexant PK.  ESRD
subjects would need to be studied with or without dialysis.  Based on the properties of the 
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lemborexant, it is highly unlikely that dialysis may affect the clearance of the drug.  Data 
from Phase 2 and 3 studies will be analyzed using population-based PK analysis to further 
support dosing recommendations for lemborexant in subjects with varying degrees of renal 
impairment.
8
STUDY OBJECTIVES
8.1
Primary Objective
The primary objective is to assess the effect of severe renal impairment on the PK of 
lemborexant after a single dose administration.
8.2
Secondary Objectives
The secondary objectives are:
•
To assess the effect of severe renal impairment on the PK of the unbound fraction of 
lemborexant.
•
To assess the effect of severe renal impairment on the PK of metabolites (M4, M9, and 
M10) of lemborexant.
9
INVESTIGATIONAL PLAN
9.1
Overall Study Design and Plan
E2006-A001-105 is multicenter, single dose, open-label, parallel-group study in subjects 
with severe renal impairment and age- , race-, sex and body mass index [BMI, ±20%]) -
matched healthy control subjects.  The study will be conducted in 2 phases: 
Prerandomization Phase (containing the Screening Period and Baseline Period [Day -1]) and 
a Treatment Phase. The Screening Period will last up to 20 days, the Baseline Period will be 
1 day, and the Treatment Phase will be 11 days.  Subjects will remain in the clinic until 
approximately 7 days after dosing (will be discharged from clinic after the Day 8 PK blood 
draw) and will return to the clinic on Day 11 for end-of-study assessments/study discharge. 
Subjects will be assigned to 1 of 2 groups:  Subjects with severe renal impairment will be 
Group 1, and subjects with normal renal function demographically matched to subjects with 
severe impairment will be Group 2.  The number of subjects per group, and estimated 
glomerular filtration rate (eGFR) values used to assign each subject to a renal function group, 
are shown in Table 1.
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Table 1
Classification of Renal Function Study Groups
Population
eGFRb
(mL/min/1.73 m2)
Number of Subjects 
per Group
Group 1: Severe renal impairment
15 to 29
and not on dialysis
(revised per Amendment 01)
8
Group 2: Normal renal function
≥90
8
a:  Day -1 estimated glomerular filtration rate (eGFR) will determine the renal category group to which a 
subject is assigned. If the Day -1 eGFR value places the subject into a different renal category group from that 
calculated at screening, the value can be repeated once within 24 to 48 hours.  If eGFR variability across these 
scheduled and repeat time points indicates the subject does not consistently meet the criteria for one renal 
category group, subject enrollment into a renal category group will be at the discretion of the Medical Monitor 
and investigator, in consultation with the sponsor.
The eGFR is determined by the Modification of Diet in Renal Disease (MDRD) formula:
eGFR (mL/min/1.73m2) = 175 x (serum creatinine)-1.154 x (age)-0.203 x (0.742 if female) x 
(1.212 if African American) (revised per Amendment 01)
Group 1 subjects (severe renal impairment) will be enrolled first. Group 2 subjects (normal 
renal function) will be matched according to age (± 10 years), race, sex, and body mass index 
(BMI; ± 20%).
Subjects determined eligible for study participation will receive a single 10 mg oral dose of 
lemborexant on Day 1.  During the Treatment Period, blood (plasma) samples will be 
obtained over 11 days for the determination of lemborexant and metabolite concentrations 
M4, M9, and M10.  Standard safety assessments will be measured before, during, and at the 
conclusion of the study.
The end of the study will be the date of the last study visit for the last subject.
9.1.1
Prerandomization Phase
The Prerandomization Phase will include a Screening Period and a Baseline Period.
9.1.1.1
Screening Period
The purpose of the Screening Period is to obtain informed consent and to establish protocol 
eligibility.  Procedures to be followed when obtaining informed consent are detailed in 
Section 5.3.  Screening period assessments and timing thereof are shown in Section 9.5.2.
9.1.1.2
Baseline Period
The purpose of the Baseline Period is to confirm protocol eligibility and to obtain baseline 
data for assessment.  Subjects who complete the Baseline Period and meet the criteria for 
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inclusion/exclusion (Sections 9.3.1 and 9.3.2) will begin the Treatment Phase.  Baseline 
assessments and timing thereof are shown in Section 9.5.2. 
9.1.2
Treatment Phase
The Treatment Phase will consist of 1 study period of 11 days.  The Treatment Phase
assessments and timing thereof are shown in Section 9.5.2.
9.2
Discussion of Study Design, Including Choice of Control Groups
9.2.1
Study Design
This single dose, parallel-group study aims to investigate the effects of severe renal 
impairment on the PK of lemborexant and its main metabolites (M4, M9, and M10).  
Sixteen (16) subjects will be enrolled, and 8 of these subjects will have severe renal 
impairment.  The other 8 subjects will be healthy and will serve as the control group. 
Healthy subjects will be matched (1:1) with the severe renal impairment subjects according 
to age (± 10 years), race, sex, and BMI (± 20%).  
The data from this study would help guide specific dosing recommendations in insomnia 
disorder and ISWRD patients with impaired renal function and establish labeling 
recommendations for this new chemical entity.
9.2.2
Adjudication Committee (revised per Amendment 01)
An independent Adjudication Committee will be employed at intervals to review, in a
blinded manner, AEs that could potentially be considered cataplexy or seizure. A set of 
preferred terms constituting a customized Medical Dictionary for Regulatory Activities 
(MedDRA) query for cataplexy or seizure will be used to identify events for adjudication 
(including cataplexy, muscle fatigue, muscular weakness, muscle tone disorder, hypotonia, 
drop attacks, slurred speech, diplopia, falls, convulsions [standardized MedDRA query 
(SMQ) narrow and broad], atypical migraine, loss of consciousness, decreased 
consciousness, myoclonus, syncope, transient global amnesia, lipothymia, [faintness] and 
transient ischemic attack). To assist in the preparation of narratives about such events and to 
support the committee’s adjudication process, investigators and site staff will be instructed to 
query subjects who report any of the above events for supplemental information using a 
questionnaire for events potentially related to cataplexy and the serious adverse event (SAE) 
form for any of the above events considered serious.
9.3
Selection of Study Population
A total of at least 16 subjects will be enrolled in each of the following 2 groups:
Group 1: 8 subjects with severe renal impairment
Group 2: At least 8 healthy subjects (control) matched to subjects in Group 1
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Subjects who do not meet all of the inclusion criteria or who meet any of the exclusion 
criteria will not be eligible to receive study drug.
9.3.1
Inclusion Criteria
Inclusion Criteria for All Subjects
Subjects who meet all of the following inclusion criteria will be eligible for participation in 
the study.
1. Male or female subjects, ages 18 to 79, inclusive, at the time of informed consent.
2. Body Mass Index (BMI) between 18 and 40 kg/m2, inclusive, at Screening.
3. Voluntary agreement to provide written informed consent, and the willingness and
ability to comply with all aspects of the protocol.
4. Nonsmokers or smokers who smoke 20 cigarettes or less per day.
5. Subjects with normal liver function.
Additional Inclusion Criteria for Healthy Subjects:
In addition to the Inclusion Criteria for All subjects, the following inclusion criterion will 
also be applied for healthy subjects with normal renal function:
6. eGFR is ≥ 90 mL/min/1.73 m2, as determined by the MDRD formula. (revised per 
Amendment 01)
Additional Inclusion Criteria for Subjects With Renal Impairment: 
In addition to the Inclusion Criteria for All subjects, the following additional inclusion 
criteria will be applied for subjects with renal impairment:
7. Diagnosis of severe renal impairment (eGFR is 15-29 mL/min/1.73 m2, as determined 
by the MDRD formula) that has been stable (without any change in disease status) for 
60 days prior to study screening and is confirmed on Day -1, as determined by the 
investigator by MDRD formula (revised per Amendment 01). If the renal function 
classification for the subject changed from screening to Day -1, eGFR should be 
repeated once within 24 to 48 hours.  If eGFR variability across these scheduled and 
repeat time points indicates the subject does not consistently meet the criteria for one 
renal category group, subject enrollment into a renal category group will be at the 
discretion of the medical monitor and investigator, in consultation with the Sponsor. 
9.3.2
Exclusion Criteria
Exclusion Criteria for All Subjects
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1. Females who are breastfeeding or pregnant at Screening or Baseline (as documented 
by a positive beta-human chorionic gonadotropin [ß-hCG] test with a minimum 
sensitivity of 25 IU/L or equivalent units of ß-hCG).  A separate baseline assessment 
is required if a negative screening pregnancy test was obtained more than 72 hours 
before the dose of study drug.
2. Females of childbearing potential who did not use a highly effective method of 
contraception (as described below) within 28 days before study entry, or who do not 
agree to use an approved method of contraception from 28 days before study entry, 
throughout the entire study period, and for 28 days after study drug discontinuation.  
Approved (highly effective) methods of contraception for this study include at least 
one of the following:

Total abstinence (if it is their preferred and usual lifestyle)

An intrauterine device or intrauterine hormone-releasing system (IUS)

A double-barrier method of contraception such as condom plus diaphragm with 
spermicide

A contraceptive implant

An oral contraceptive (with additional barrier method). Subject must be on a 
stable dose of the same oral contraceptive product for at least 28 days before 
dosing and throughout the study and for 28 days after study drug discontinuation.

Have a vasectomized partner with confirmed azoospermia.
(NOTE: All females will be considered to be of childbearing potential unless they are 
postmenopausal [amenorrheic for at least 12 consecutive months, in the appropriate 
age group, and without other known or suspected cause] or have been sterilized 
surgically [ie, bilateral tubal ligation, total hysterectomy, or bilateral oophorectomy, 
all with surgery at least 1 month before dosing]).
3. Intake of food supplements (including herbal preparations), foods or beverages that 
may 
affect 
CYP3A4 
enzyme 
(eg,
alcohol, 
grapefruit, 
grapefruit 
juice, 
grapefruit-containing beverages, apple or orange juice, vegetables from the mustard 
green family [eg, kale, broccoli, watercress, collard greens, kohlrabi, Brussels 
sprouts, mustard] and charbroiled meats) within 2 weeks before dosing until study 
discharge.
4. Use of an herbal preparation containing St. John’s Wort within 4 weeks before dosing 
until study discharge.
5. Known to be positive for human immunodeficiency virus (HIV).
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6. Presence of acute and active liver disease, or acute liver injury, as indicated by (1) an 
abnormal liver function test, or (2) clinical or laboratory signs of acute, active viral 
hepatitis (including B and C as demonstrated by positive serology at Screening).  
Subjects with stable, chronic, inactive viral hepatitis B or C may be enrolled based on 
investigator’s opinion.
7. QTcF interval > 480, QT interval corrected for heart rate (QTc) by Fridericia’s 
formula (QTcF) msec on electrocardiograms (ECGs) at Screening or Day -1. Before 
excluding a subject with QTcF > 480 at Screening, ECG should be repeated once to 
confirm.
8. A known or suspected history of drug or alcohol abuse disorder within 6 months prior 
to Screening.
9. A positive urine drug test or a positive breathalyzer alcohol test at Screening or 
Day -1.
10. Participation in another interventional clinical trial within 4 weeks, or 5 times the 
half-life of the investigational drug (whichever is longer), of lemborexant 
administration. 
11. Engaged in heavy/strenuous physical exercise within 2 weeks prior to check-in on 
Day -1 (eg, marathon runners, weight lifters).
12. Unwilling to abide by the study requirements, or in the opinion of the investigator, is 
not likely to complete the study.
13. History of clinically significant drug or food allergies, or is presently experiencing 
significant seasonal allergies.
14. Recent weight change that is considered clinically significant by the Investigator.
15. Clinically significant findings revealed by physical examination, assessment of vital 
signs, ECG, or clinical laboratory testing.
16. Use of any prohibited prescription or over-the-counter (OTC) medication within 
2 weeks or 5 half-lives (whichever is longer) before Screening, or plans to use any 
such treatment during the study.  For subjects with renal impairment, chronic stable 
administration of medications necessary for maintaining the clinical status of the 
subject may be permitted after consultation with the Medical Monitor.
Additional Exclusion Criteria for Healthy Subjects:
In addition to the Exclusion Criteria above for All Subjects, other standard exclusion criteria 
for healthy subjects in Phase 1 studies will be used. These include:
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17. Presence of clinically significant illness requiring treatment or that may influence the 
outcome of the study (eg psychiatric disorders, disorders of the gastrointestinal tract, 
liver, kidney, respiratory system, endocrine system, hematological system, 
neurological system, or cardiovascular system), a history of myocardial infraction, or
a congenital abnormality.
18. Receipt or donation of blood or blood products within 4 to 8 weeks prior to study 
drug administration.
Additional Exclusion Criteria for Subjects With Renal Impairment:
In addition to the Exclusion Criteria for All Subjects, other exclusion criteria for subjects 
with renal impairment will include:
19. Any history of renal transplant.
20. Any known significant bleeding diathesis (for example, history of recent bleeding 
from esophageal varices), which could preclude multiple venipuncture or deep 
intramuscular injections.
21. New significant illness that onset within 2 weeks prior to study drug administration.
22. Current clinically relevant disease other than the renal impairment (eg, cardiac, 
hepatic, gastrointestinal disorder, or a condition which may impact drug absorption), 
as determined by the investigator.  Subjects with a history of Type I or Type II 
diabetes may be eligible, providing that, in the investigator’s opinion, the disease has 
been stable.  Subjects receiving insulin therapy may be eligible provided they have 
been on a stable (ie, dose has not changed) treatment for at least 2 weeks prior to 
study enrollment and will continue the treatment throughout the study.
9.4
Treatments
Test drug: lemborexant (E2006)
Comparator Drug: Not applicable
9.4.1
Treatments Administered
All subjects enrolled in the study will receive a single 10 mg dose (1 × 10 mg lemborexant 
tablet) in the morning after an overnight fast.
9.4.2
Identity of Investigational Product
Test drug will be supplied by the sponsor in labeled containers.
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9.4.2.1
Chemical Name, Structural Formula of E2006
•
Test drug code: E2006
•
Generic name:  Lemborexant tablet
•
Chemical name:  (1R,2S)-2-{[(2,4-Dimethylpyrimidin-5-yl)oxy]methyl}-2-(3-
fluorophenyl)-N-(5-fluoropyridin-2-yl)cyclopropanecarboxamide
•
Molecular formula:  C22H20F2N4O2
•
Molecular weight (molar mass):  410.42 g/mol
9.4.2.2
Comparator Drug
Not applicable.
9.4.2.3
Labeling for Study Drug
Lemborexant will be labeled in accordance with text that is in full regulatory compliance 
with each participating country and is translated into the required language(s) for each of 
those countries.
9.4.2.4
Storage Conditions
Study drug will be stored in accordance with the labeled storage conditions.  Temperature 
monitoring is required at the storage location to ensure that the study drug is maintained 
within an established temperature range.  The investigator or designee is responsible for 
ensuring that the temperature is monitored throughout the total duration of the study and that 
records are maintained; the temperature should be monitored continuously by using either an 
in-house validated data acquisition system, a mechanical recording device, such as a 
calibrated chart recorder, or by manual means, such that minimum and maximum 
thermometric values over a specific time period can be recorded and retrieved as required.
9.4.3
Method of Assigning Subjects to Treatment Groups
Subjects will be assigned to 1 of 2 groups:  Subjects with severe renal impairment will be 
Group 1, and subjects with normal renal function demographically matched to subjects with 
severe impairment will be Group 2.  The number of subjects per group, and eGFR values 
used to assign each subject to a renal function group, are shown in Table 1.
9.4.4
Selection of Doses in the Study
Lemborexant 10 mg proposed in this study is consistent with the highest dose being tested in 
Phase 3 clinical trials for insomnia disorder.
9.4.5
Selection and Timing of Dose for Each Subject
Following an overnight fast of at least 10 hours, subjects will be administered the study drug 
product in the morning with 240 mL (8 fluid ounces) of water. No food will be allowed for 
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at least 4 hours postdose. Water will be allowed as desired except for 1 hour before and after 
drug administration.
9.4.6
Blinding
The study will not be blinded.
9.4.7
Prior and Concomitant Therapy
Any medication (including over-the-counter [OTC] medications) or therapy administered to 
the subject within 30 days prior to Screening until the end of study participation will be 
recorded on the Prior and
Concomitant Medication
case report form
(CRF)
or 
Non-Pharmacological Procedures CRF.  The investigator will record on the Adverse Event 
CRF any adverse event (AE) for which the concomitant medication/therapy was 
administered. 
The following prior and concomitant therapies are prohibited for all subjects:

Nutritional supplements, juice, and herbal preparations or other foods or beverages that 
may affect the various drug metabolizing enzymes and transporters (eg, alcohol, 
grapefruit, grapefruit juice, grapefruit-containing beverages, apple or orange juice, 
vegetables from the mustard green family [eg, kale, broccoli, watercress, collard greens, 
kohlrabi, Brussels sprouts, mustard], and charbroiled meats) within 1 week before dosing 
until study discharge.

Intake of food supplements (including herbal preparations), foods or beverages that may 
affect CYP3A4 enzyme (eg, alcohol, grapefruit, grapefruit juice, grapefruit-containing 
beverages, apple or orange juice, vegetables from the mustard green family [eg, kale, 
broccoli, watercress, collard greens, kohlrabi, Brussels sprouts, mustard] and charbroiled 
meats) within 2 weeks before dosing until study discharge.

Intake of beverages, food, or other products that contain caffeine from 24 hours before 
until 48 hours after dosing with lemborexant. 

Herbal preparations containing St. John’s Wort within 4 weeks before dosing until study 
discharge.
For healthy subjects, use of prescription or over-the-counter (OTC) medications is prohibited 
within 2 weeks or 5 half-lives (whichever is longer) before Screening and until discharge
from the study.  For subjects with renal impairment, chronic stable administration of 
medications necessary for maintaining the clinical status of the subject may be permitted if 
approved by Medical Monitor.  Any concomitant therapies must be recorded on the CRF. 
Concomitant medication may not be administered 4 hours before or after study drug 
administration on Day 1.  
See Section 12, Appendix 2, for a full list of prohibited concomitant medications.
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9.4.8
Prohibitions and Restrictions during Study Period
9.4.8.1
Food and Water
Menus will be standardized while subjects are inpatients in the study unit.  The menus will be 
the same for all subjects; however, the menus for each inpatient day need not be identical. 
Subjects must consume only the food given to them while in the unit.  Food and water will be 
restricted as follows:
Day -1 (Baseline)
•
Subjects will be given an evening snack following check-in to the study unit on the day 
before dosing.  They will fast (only water is permitted) for at least 10 hours prior to 
dosing.
Day 1 (day of dose administration)
•
Subjects will fast (only water is permitted) for at least 4 hours after dosing.  Fluid will be 
restricted (240 mL water at time of oral dosing) from 1 hour before dosing until 1 hour 
after dosing.  
•
A low-fat lunch (<30% fat), an afternoon snack, dinner, and an evening snack will be 
provided at appropriately scheduled times.
Days 2 through 8
•
A similar schedule and menu for meals/snacks will be followed on each day after dosing 
until clinic discharge. There will be free access to drinking water throughout each day.
9.4.8.2
Beverage and Other Restrictions

Intake of beverages, food, or other products that contain caffeine from at least 24 hours 
before until at least 48 hours after dosing with lemborexant. 
Intake of nutritional supplements, juice, herbal preparations, or other foods or beverages 
that may affect CYP 3A4 enzyme or transporters (eg, alcohol, grapefruit, grapefruit juice, 
grapefruit-containing beverages, apple or orange juice, vegetables from the mustard green 
family [eg, kale, broccoli, watercress, collard greens, kohlrabi, brussels sprouts, mustard] 
and charbroiled meats) within 2 weeks before dosing until study discharge.

Smokers must not smoke more than 20 cigarettes per day.
9.4.8.3
Physical Activity Restrictions

Engagement in strenuous exercise is prohibited within 2 weeks before check-in on Day -1 
and until study discharge.

Subjects should maintain an upright (greater than 45angle) position for at least 4 hours 
following administration of study drug, except for adverse events (AEs) or study-related 
procedures requiring a different position.
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9.4.9
Treatment Compliance
All doses will be administered by qualified research site personnel ensuring compliance to 
the protocol-specified dosing regimens. Each subject’s dose will be administered at the 
designated dosing time and documented in the source documents maintained on site.  At the 
end of each tablet dose, a hand and mouth check will be performed to ensure that the entire 
dose of study drug has been properly consumed.
Records of treatment compliance for each subject will be kept during the study.  Clinical 
research associates (CRAs) will review treatment compliance during site visits and at the 
completion of the study.
9.4.10
Drug Supplies and Accountability
In compliance with local regulatory requirements, drug supplies will not be sent to the 
investigator until the following documentation has been received by the sponsor:
•
A signed and dated confidentiality agreement
•
A copy of the final protocol signature page, signed and dated by both the sponsor and 
investigator
•
Written proof of approval of the protocol, the ICFs, and any other information provided 
to the subjects by the IRB/IEC for the institution where the study is to be conducted
•
A copy of the IRB/IEC-approved ICF and any other documentation provided to the 
subjects to be used in this study
•
The IRB/IEC membership list and statutes or Health and Human Services Assurance 
number
•
A copy of the certification and a table of the normal laboratory ranges for the reference 
laboratory conducting the clinical laboratory tests required by this protocol
•
An investigator-signed and dated Food and Drug Administration (FDA) Form FDA 1572, 
where applicable
•
Financial Disclosure form(s) for the principal investigator (PI) and all subinvestigators 
listed on Form FDA 1572, where applicable
•
A signed and dated curriculum vitae (CV) of the PI including a copy of the PI’s current 
medical license or medical registration number on the CV
•
A signed and dated clinical studies agreement
The investigator and the study staff will be responsible for the accountability of all study 
drugs/study supplies (dispensing, inventory, and record keeping) following the sponsor’s 
instructions and adherence to Good Clinical Practice (GCP) guidelines as well as local or 
regional requirements.
Under no circumstances will the investigator allow the study drugs/study supplies to be used 
other than as directed by this protocol.  Study drugs/study supplies will not be dispensed to 
any individual who is not enrolled in the study.
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The site must maintain an accurate and timely record of the following:  receipt of all study 
drugs/study supplies, dispensing of study drugs/study supplies to the subject, collection and 
reconciliation of unused study drugs/study supplies that are either returned by the subjects or 
shipped to site but not dispensed to subjects, and return of reconciled study drugs/study 
supplies to the sponsor or (where applicable) destruction of reconciled study drugs/study 
supplies at the site.  This includes, but may not be limited to:  (a) documentation of receipt of 
study drugs/study supplies, (b) study drugs/study supplies dispensing/return reconciliation 
log, (c) study drugs/study supplies accountability log, (d) all shipping service receipts, (e) 
documentation of returns to the sponsor, and (f) certificates of destruction for any destruction 
of study drugs/study supplies that occurs at the site.  All forms will be provided by the 
sponsor.  Any comparable forms that the site wishes to use must be approved by the sponsor.
The study drugs/study supplies and inventory records must be made available, upon request, 
for inspection by a designated representative of the sponsor or a representative of a health 
authority (eg, FDA, MHRA).  As applicable, all unused study drugs/study supplies and 
empty and partially empty containers from used study drugs/study supplies are to be returned 
to the investigator by the subject and together with unused study drugs/study supplies that 
were shipped to the site but not dispensed to subjects are to be returned to the sponsor’s 
designated central or local depot(s) during the study or at the conclusion of the study, unless 
provision is made by the sponsor for destruction of study drugs/study supplies and containers 
at the site.  Destruction at the site will only occur under circumstances where regulation or 
supply type prohibits the return of study drugs/study supplies to the central or local depot(s).  
Approval for destruction to occur at the site must be provided by the sponsor in advance.  
Upon completion of drug accountability and reconciliation procedures by the site’s personnel 
and documentation procedures by the sponsor’s personnel, study drugs/study supplies that 
are to be returned to the sponsor’s designated central or local depot(s) must be boxed and 
sealed and shipped back to the central or local depot(s) following all local regulatory 
requirements.  In some regions, study drugs/study supplies may be removed from the site and 
hand delivered to the central or local depot by sponsor representatives.  Where study 
drugs/study supplies are approved for destruction at the site, destruction will occur following 
the site’s standard procedures and certificates of destruction will be provided to the sponsor.
Drug accountability will be reviewed during site visits and at the completion of the study.
9.5
Study Assessments
9.5.1
Assessments
9.5.1.1
Demography
Subject demographic information will be collected at the Screening Visit.  Demographic
information includes date of birth (or age), sex, race/ethnicity, and BMI.
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9.5.1.2
Baseline Assessments
9.5.1.2.1
MEDICAL HISTORY
Medical and surgical history and current medical conditions will be recorded at the Screening 
Visit.  All clinically relevant medical and surgical history must be noted in the Medical 
History and Current Medical Conditions CRF.
9.5.1.2.2
HEIGHT AND WEIGHT MEASUREMENTS
Height (cm) and weight (kg) will be recorded and BMI will be determined at the Screening 
Visit. Subjects will have their weight (kg) measured again on Day -1.
9.5.1.3
Efficacy Assessments
Not applicable.
9.5.1.4
Pharmacokinetic, Pharmacodynamic, Pharmacogenomic, and Other Biomarker
Assessments
9.5.1.4.1
PHARMACOKINETIC ASSESSMENTS
Plasma concentration of Lemborexant
Blood samples (4 mL e ach) will be collected as specified in the Schedule of Procedures/
Assessments (Table 3).  A separate lab manual will be provided for a description of 
collection, handling, and shipping procedures of the plasma samples for PK analysis.  In 
addition, blood samples for protein binding (12 mL per time point) of lemborexant will be 
collected at 1 and 24 hours postdose matching the PK sample collection at those time points.
Total plasma concentrations of lemborexant and its metabolites (M4, M9, and M10) will be 
measured by validated liquid chromatography with tandem mass spectrometry (LC-MS/MS) 
methods.  The unbound concentrations of lemborexant, M4, M9, and M10 will also be 
measured using a similar validated LC-MS/MS method following equilibrium dialysis.
9.5.1.4.2
PHARMACODYNAMIC, PHARMACOGENOMIC, AND OTHER BIOMARKER ASSESSMENTS
Not applicable.
9.5.1.5
Safety Assessments
Safety assessments will consist of monitoring and recording all AEs and SAEs; regular 
monitoring of laboratory tests for hematology, blood chemistry, and urine values; periodic 
measurement of vital signs and ECGs; and performance of physical examinations as detailed 
in Table 3.
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9.5.1.5.1
ADVERSE EVENTS
An AE is any untoward medical occurrence in a patient or clinical investigation subject 
administered an investigational product. 
An AE does not necessarily have a causal 
relationship with the medicinal product.  For this study, the study drug is lemborexant. 
The criteria for identifying AEs in this study are:
•
Any unfavorable and unintended sign (including an abnormal laboratory finding), 
symptom, or disease temporally associated with the use of an investigational product, 
whether or not considered related to the investigational product (Note:  Every sign or 
symptom should not be listed as a separate AE if the applicable disease [diagnosis] is 
being reported as an AE)
•
Any new disease or exacerbation of an existing disease 
•
Any deterioration in nonprotocol-required measurements of a laboratory value or other 
clinical test (eg, ECG or x-ray) that results in symptoms, a change in treatment, or 
discontinuation of study drug
•
Recurrence of an intermittent medical condition (eg, headache) not present pretreatment 
(Baseline)
•
An abnormal laboratory test result should be considered an AE if the identified laboratory 
abnormality leads to any type of intervention, withdrawal of study drug, or withholding 
of study drug, whether prescribed in the protocol or not.
All AEs observed during the study will be reported on the CRF.  All AEs, regardless of 
relationship to study drug or procedure, should be collected beginning from the time the 
subject signs the study ICF through the last visit in the Treatment Phase and for 28 days after 
the subject’s last dose.  Serious AEs will also be collected for 28 days after the last dose.
Abnormal laboratory values should not be listed as separate AEs if they are considered to be 
part of the clinical syndrome that is being reported as an AE.  It is the responsibility of the 
investigator to review all laboratory findings in all subjects and determine if they constitute 
an AE.  Medical and scientific judgment should be exercised in deciding whether an isolated 
laboratory abnormality should be classified as an AE.  Any laboratory abnormality 
considered to constitute an AE should be reported on the Adverse Event CRF.
All AEs must be followed for 28 days after the subject’s last dose, or until resolution, 
whichever comes first.  All SAEs must be followed to resolution or, if resolution is unlikely, 
to stabilization.
Every effort must be made by the investigator to categorize each AE according to its 
severity and its relationship to the study treatment.
Assessing Severity of Adverse Events
AEs will be graded on a 3-point scale (mild, moderate, severe) and reported in the detail 
indicated on the CRF.  The definitions are as follows:
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Mild
Discomfort noticed, but no disruption of normal daily activity
Moderate Discomfort sufficient to reduce or affect normal daily activity
Severe
Incapacitating, with inability to work or to perform normal daily activity
The criteria for assessing severity are different than those used for seriousness (see
Section 9.5.1.5.2 for the definition of an SAE).
Assessing Relationship to Study Treatment
Items to be considered when assessing the relationship of an AE to the study treatment are:
•
Temporal relationship of the onset of the event to the initiation of the study treatment
•
The course of the event, especially the effect of discontinuation of study treatment or 
reintroduction of study treatment, as applicable
•
Whether the event is known to be associated with the study treatment or with other 
similar treatments
•
The presence of risk factors in the study subject known to increase the occurrence of the 
event
•
The presence of nonstudy, treatment-related factors that are known to be associated with 
the occurrence of the event
Classification of Causality
The relationship of each AE to the study drug will be recorded on the CRF in response to the 
following question:
Is there a reasonable possibility that the study drug caused the AE?
Yes (related)
A causal relationship between the study drug and the AE is a reasonable 
possibility.
No (not related) A causal relationship between the study drug and the AE is not a 
reasonable possibility.
9.5.1.5.2
SERIOUS ADVERSE EVENTS AND EVENTS ASSOCIATED WITH SPECIAL SITUATIONS
A serious adverse event (SAE) is any untoward medical occurrence that at any dose:
•
Results in death
•
Is life-threatening (ie, the subject was at immediate risk of death from the adverse event 
as it occurred; this does not include an event that, had it occurred in a more severe form 
or was allowed to continue, might have caused death)
•
Requires inpatient hospitalization or prolongation of existing hospitalization
•
Results in persistent or significant disability/incapacity
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•
Is a congenital anomaly/birth defect (in the child of a subject who was exposed to the 
study drug)
Other important medical events that may not be immediately life-threatening or result in 
death or hospitalization but, when based on appropriate medical judgment, may jeopardize 
the subject or may require intervention to prevent one of the outcomes in the definition of 
SAE listed above should also be considered SAEs.  Medical and scientific judgment should 
be exercised in deciding whether expedited reporting is appropriate in such situations. 
In addition to the above, events associated with special situations include pregnancy or 
exposure to study drug through breastfeeding; AEs associated with study drug overdose, 
misuse, abuse, or medication error.  These events associated with special situations are to be 
captured using the SAE procedures but are to be considered as SAEs only if they meet one of 
the above criteria.  All AEs associated with special situations are to be reported on the CRF 
whether or not they meet the criteria for SAEs.  
All SAEs must be followed to resolution or, if resolution is unlikely, to stabilization.
The following hospitalizations are not considered to be SAEs because there is no “adverse 
event” (ie, there is no untoward medical occurrence) associated with the hospitalization:
•
Hospitalizations for respite care 
•
Planned hospitalizations required by the protocol
•
Hospitalization planned before informed consent (where the condition requiring the 
hospitalization has not changed post study drug administration)
•
Hospitalization for administration of study drug or insertion of access for administration 
of study drug
•
Hospitalization for routine maintenance of a device (eg, battery replacement) that was in 
place before study entry
If possible, a blood sample for PK analysis should be drawn at the first report of an SAE or a 
severe unexpected AE and at its resolution.
9.5.1.5.3
LABORATORY MEASUREMENTS
Clinical laboratory tests to be performed, including hematology, chemistry, and urinalysis, 
are summarized in Table 2.  Subjects should be in a seated or supine position during blood 
collection and are to be fasting for at least 4 hours before blood is drawn for clinical 
laboratory measurements.  The Schedule of Procedures/Assessments (Table 3) shows the 
visits and time points at which blood for clinical laboratory tests and urine for urinalysis will 
be collected in the study.
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Table 2
Clinical Laboratory Tests
Category
Parameters
Hematology
Hematocrit, hemoglobin, platelets, red blood cell (RBC)
count, and white blood cell (WBC) count with differential
(bands, basophils, eosinophils, lymphocytes, monocytes,
neutrophils)
Chemistry
Electrolytes
Chloride, potassium, sodium, calcium
Liver function tests
Alanine aminotransferase, alkaline phosphatase, aspartate
aminotransferase,
gamma
glutamyl
transpeptidase,
direct
bilirubin, total bilirubin
Renal function tests
Blood urea/blood urea nitrogen, creatinine
Other
Total protein, albumin, globulin, cholesterol, triglycerides,
glucose, lactate dehydrogenase, uric acid
Urinalysis
Bacteria, casts, crystals, epithelial cells, glucose, ketones,
occult blood, pH, protein, RBCs, WBCs, specific gravity
Virology
Hepatitis B surface antigen (HBsAg) and hepatitis C antibody
(HCVAb)
Clinical laboratory tests during the study will be performed by a Clinical Laboratory
Improvement Amendments (CLIA) certified laboratory. All blood and urine samples will be 
collected and sent to the central laboratory on the day of collection unless otherwise 
instructed.
A laboratory abnormality may meet the criteria to qualify as an AE as described in this 
protocol (see Section 9.5.1.5.1) and the CRF Completion Guidelines.  In these instances, the 
AE corresponding to the laboratory abnormality will be recorded on the Adverse Event CRF.
9.5.1.5.4
VITAL SIGNS AND WEIGHT MEASUREMENTS
Vital sign measurements (ie, systolic and diastolic blood pressure [BP] [mmHg], pulse [beats 
per minute], respiratory rate [per minute], body temperature [in centigrade]), and weight (kg) 
will be obtained as designated in the Schedule of Procedures/Assessments (Table 3) by a 
validated method.  Blood pressure and pulse will be measured after the subject has been in 
supine position for 5 minutes.  All BP measurements should be performed on the same arm, 
preferably by the same person.
When vital signs are to be obtained concurrently with PK or other blood samples, the vital 
sign measurements will be performed prior to drawing blood samples in order to maximize 
the accuracy of blood sampling times while minimizing the potential effects of blood 
drawing on recordings obtained during safety assessments.
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9.5.1.5.5
PHYSICAL EXAMINATIONS
Comprehensive and abbreviated physical examinations will be performed as designated in
the Schedule of Procedures/Assessments (Table 3).  Documentation of the physical 
examination will be included in the source documentation at the site.  Significant findings at 
the Screening Visit will be recorded on the Medical History and Current Medical Conditions 
CRF.  Changes from screening physical examination findings that meet the definition of an 
AE will be recorded on the Adverse Events CRF.
Comprehensive Physical Examination
A comprehensive physical examination will include evaluations of the head, eyes, ears, nose, 
throat, neck, chest (including heart and lungs), abdomen, limbs, skin, and a complete 
neurological examination.  The subject will be queried regarding physical status and 
subjective symptoms as well. 
Abbreviated/Routine Physical Examination
Health status will be assessed by brief evaluation of the chest (including heart and lungs), 
abdomen and limbs, and other physical conditions of note.  The subject must be queried 
regarding changes in physical status since the last examination.
9.5.1.5.6
ELECTROCARDIOGRAMS
Twelve-lead electrocardiograms will be obtained and reviewed locally as designated in the 
Schedule of Procedures/Assessments (Table 3). 
An ECG abnormality may meet the criteria of an AE as described in this protocol (see
Section 9.5.1.5.1) and the CRF Completion Guidelines.  In these instances, the AE 
corresponding to the ECG abnormality will be recorded on the Adverse Events CRF.
9.5.1.5.7
VIRAL TESTS
A 4 mL sample of blood will be taken at Screening to test for hepatitis B surface antigen 
(HBsAg) and hepatitis C antibodies (HCVAb).
9.5.1.5.8
PREGNANCY TEST
At Screening, a serum pregnancy (β-hCG test) will be performed for all premenopausal 
women and postmenopausal women who have been amenorrheic for less than 12 months
using the 8.5 mL blood sample taken for clinical laboratory tests. These women will have 
urine pregnancy test after Screening at the designated time points specified in the Schedule of 
Procedures/Assessments (Table 3).
9.5.1.5.9
URINE DRUG TEST
A 30-mL u rine sample will be collected at designated time points as specified in 
the Schedule of Procedures/Assessments (Table 3).  T his sample will be tested for 
common 
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drugs of use/abuse: eg, cocaine, cannabinoids, PCP, opioids (as a group), benzodiazepines, 
barbiturates, and amphetamines.
9.5.1.5.10
BREATH ALCOHOL TEST
The breath alcohol test will be performed according to the investigational site’s SOP at 
designated time points as specified in the Schedule of Procedures/Assessments (Table 3).
9.5.2
Schedule of Procedures/Assessments
9.5.2.1
Schedule of Procedures/Assessments
Table 3 presents the schedule of procedures/assessments for the study.
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Table 3 
Schedule of Procedures / Assessments in Study E2006-A001-105
Study Phase
Prerandomization
Treatment
Period
Screening
Baseline
Visit
1
2
3/ET
Day(s)
-21 to -2
-1
1
2
3-7
8
11/ET
Assessment
Informed Consent
X
Inclusion/Exclusion Criteria
X
X
Medical History and Demographics
X
Comprehensive Physical Exam
X
Abbreviated/Routine Physical Exam
X
X
Determination of Renal Category a:
X
X
Height, Weight, and BMI
X
  X b:
Vital Signs c:
X
X
X
X
X
X
12-lead ECG d:
X
X
X
X
Viral Screen (hepatitis B and C)
X
Urine Drug Test
X
X
Alcohol Breathalyzer
X
X
Serum βhCG  Pregnancy Test e:
X
Urine Pregnancy Test e:
X
X
Clinical Labs (hematology, clinical chemistry, and 
urinalysis) f:
X
X
X
X
PK blood sampling g:
X
X
X
X
X
Blood Sample for Protein Binding Assessment h:
X
X
Administer lemborexant i:
X
Admission to clinic
X
Release from clinic j:
X
Discharge from study k:
X
Adverse Events
------------------------------------------------------------------------------------------------------------------------
Prior/Concomitant Medications
------------------------------------------------------------------------------------------------------------------------
ß-hCG = beta-human chorionic gonadotropin; BMI = body mass index; ECG = electrocardiogram; PK = pharmacokinetic
a: 
Renal impairment will be determined from the clinical serum creatinine at screening using eGFR as calculated according to the MDRD formula.  (revised 
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per Amendment 01) Day -1 estimated glomerular filtration rate (eGFR) will determine the renal category group to which a subject is assigned. If the 
Period 1 Day -1 eGFR value places the subject into a different renal category group from that calculated at screening, the value can be repeated once within 
24 to 48 hours. If eGFR variability across these scheduled and repeat time points indicates the subject does not consistently meet the criteria for one renal 
category group, subject enrollment into a renal category group will be at the discretion of the Medical Monitor and investigator, in consultation with the 
sponsor.
b:
Only weight will be recorded on Day -1. 
c:
Single measurements of vital signs (blood pressure, heart rate, body temperature, and respiratory rate) after at least 5 minutes of supine rest will be recorded 
at Screening, clinic check-in  on Day -1, predose on Day 1, Day 2, prior to clinic discharge on Day 8, and at end-of study (Day 11 or early termination).
d:
Single ECG will be recorded at Screening, Baseline (Day -1), Day 1 (predose and 3 hours postdose), and Day 11 (240 hours postdose). A variance of 
±15 minutes is allowed.  Before excluding a subject with QTcF > 480 at Screening, ECG should be repeated once to confirm.
e:
Females of childbearing potential only.  
f:
Subjects will fast for at least 4 hours before blood is drawn for clinical laboratory assessments, including measurement of serum albumin.  (revised per 
Amendment 01)
g:
Blood samples (4 mL per time point) for PK assessments will be collected on Day 1 (predose and at 0.5, 1, 1.5, 2, 3, 4, 6, 8, and 12 hours postdose), Days 2 
(24 and 36 hours postdose), 3 (48 hours postdose), 4 (72 hours postdose), 5 (96 hours postdose), 6 (120 hours postdose), 7 (144 hours postdose), 8 
(168 hours postdose), and 11 (240 hours postdose). If a subject is early terminated, he or she will not have a blood sample collected for PK unless early 
termination coincides with a scheduled PK time point.  A variance of ±5 minutes (up to first 2 hours postdose) and ±10 minutes for rest of the time points is 
allowed. A blood sample for PK analysis should be drawn at the first report of an SAE or a severe unexpected AE and at its resolution.
h:
Blood samples (12 mL per time point) for plasma protein binding will be collected at 1 and 24 hours postdose, matching with the time collection for PK 
samples for lemborexant.
i:
A single 10-mg dose of lemborexant as 1×10 mg tablet will be administered with 240 mL of water following an overnight fast. Dosing will be in the 
morning followed by a 4-hour postdose fast. Water will be allowed ad libitum except for the interval from 1 hour before to 1 hour after study drug 
administration.
j:
Subjects will be released from the clinic after completing the Day 8 procedures.
k:
Subject will be released from the study after completion of Day 11 (end-of-study) procedures or early termination.
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Table 4 presents the blood sampling schedule for PK assessments.
Table 4
Blood Sampling Schedule for Pharmacokinetic Assessments
Study Day
Time (on each Day)
Acceptable Time-window
Day 1
Predose and at 0.5, 1, 1.5, 2, 3, 4, 6, 8, 
and 12 hours postdose
Predose; -1 hour
Postdose (up to first 2 hours postdose); ± 5 minutes 
Postdose (after 2 hours postdose); ± 10 minutes
Day 2
24 and 36 hours postdose
± 10 minutes
Day 3
48 hours postdose
Day 4
72 hours postdose
Day 5
96 hours postdose
Day 6
120 hours postdose
Day 7
144 hours postdose
Day 8
168 hours postdose
Day 11
240 hours postdose
9.5.2.2
Total Volume of Blood Sampling
Table 5 presents the number of blood samples and the total volume of blood that will be 
collected throughout the study. Additional samples may be taken at the discretion of the 
investigator if the results of any tests fall outside reference ranges or clinical symptoms 
necessitate testing to ensure subject safety.
Table 5
Summary of Blood Sample Volumes
Sample Volume per 
Collection (mL)
Number of Collection Time 
Points
Total Volume
Collected (mL)
Clinical laboratory tests
8.5
Screening (including pregnancy 
testing): 1
Baseline (Day -1): 1
Day 2: 1
Day 11 or early termination: 1
8.54=34
Viral test
4
Screening: 1
41=4
PK blood sampling
4
19
419=76
Blood sampling for plasma 
protein binding
12
2
212=24
Total
138
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9.5.3
Appropriateness of Measurements
All clinical assessments are standard measurements commonly used in bioavailability 
studies.
The safety assessments to be performed in this study, including hematology analyses, blood 
chemistry tests, urinalysis, and assessment of AEs, are standard evaluations to ensure subject 
safety.
9.5.4
Reporting of Serious Adverse Events, Pregnancy, and Events Associated 
with Special Situations
9.5.4.1
Reporting of Serious Adverse Events
All SERIOUS ADVERSE EVENTS, regardless of their relationship to study treatment, must 
be reported on a completed SAE form by email or fax as soon as possible but no later than 
24 hours from the date the investigator becomes aware of the event.
Serious adverse events, regardless of causality assessment, must be collected through the last 
visit in the Treatment Phase and for 28 days after the subject’s last dose (revised per 
Amendment 01).  All SAEs must be followed to resolution or, if resolution is unlikely, to 
stabilization.  Any SAE judged by the investigator to be related to the study treatment or any 
protocol-required procedure should be reported to the sponsor regardless of the length of 
time that has passed since study completion.
The detailed contact information for reporting of SAEs is provided in the Investigator 
Study File.
For urgent safety issues call: 
(24/7 number). 
For urgent safety issues, please ensure all appropriate medical care is administered to the 
subject and contact the appropriate study team member listed in the Investigator Study File.
It is very important that the SAE report form be filled out as completely as possible at the 
time of the initial report.  This includes the investigator’s assessment of causality.
Any follow-up information received on SAEs should be forwarded within 24 hours of its 
receipt.  If the follow-up information changes the investigator’s assessment of causality, this 
should also be noted on the follow-up SAE form.
Preliminary SAE reports should be followed as soon as possible by detailed descriptions 
including copies of hospital case reports, autopsy reports, and other documents requested by 
the sponsor.
The investigator must notify his/her IRB/IEC of the occurrence of the SAE, in writing, if 
required by their institution.  A copy of this communication must be forwarded to the sponsor 
to be filed in the sponsor’s Trial Master File.
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9.5.4.2
Reporting of Pregnancy and Exposure to Study Drug Through Breastfeeding
Any pregnancy in a female subject in which the estimated date of conception is either before 
the last visit or within 28 days of last study treatment or any exposure to study drug through 
breastfeeding during study treatment or within 28 days of last study treatment must be 
reported.
If an adverse outcome of a pregnancy is suspected to be related to study drug exposure, this 
should be reported regardless of the length of time that has passed since the exposure to study 
treatment.
A congenital anomaly, death during perinatal period, an induced abortion, or a spontaneous 
abortion are considered to be an SAE and should be reported in the same time frame and in 
the same format as all other SAEs (see Section 9.5.4.1).
Pregnancies or exposure to study drug through breastfeeding must be reported by fax or 
email as soon as possible but no later than 24 hours from the date the investigator becomes 
aware of the pregnancy.  The contact information for the reporting of pregnancies and 
exposure to study drug through breastfeeding is provided in the Investigator Study File.  The 
Pregnancy Report Form must be used for reporting.  All pregnancies must be followed to
outcome.  The outcome of the pregnancy must be reported as soon as possible but no later 
than 24 hours from the date the investigator becomes aware of the outcome.
A subject who becomes pregnant must be withdrawn from the study. 
9.5.4.3
Reporting of Events Association with Special Situations
9.5.4.3.1
REPORTING OF ADVERSE EVENTS ASSOCIATED WITH STUDY DRUG OVERDOSE,
MISUSE, ABUSE, OR MEDICATION ERROR
Adverse events associated with study drug overdose, misuse, abuse, and medication error 
refer to AEs associated with uses of the study drug outside of that specified by the protocol.  
Overdose, misuse, abuse, and medication error are defined as follows:
Overdose
Accidental or intentional use of the study drug in an amount higher 
than the protocol-defined dose
Misuse
Intentional and inappropriate use of study drug not in accordance with 
the protocol
Abuse
Sporadic or persistent intentional excessive use of study drug 
accompanied by harmful physical or psychological effects
Medication error
Any unintentional event that causes or leads to inappropriate study 
drug use or subject harm while the study drug is in the control of site 
personnel or the subject.
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All AEs associated with overdose, misuse, abuse, or medication error should be captured on 
the Adverse Event CRF and also reported using the procedures detailed in Section 9.5.4.1
even if the AEs do not meet serious criteria.  Abuse is always to be captured as an AE.  If the 
AE associated with an overdose, misuse, abuse, or medication error does not meet serious 
criteria, it must still be reported using the SAE form and in an expedited manner but should 
be noted as nonserious on the SAE form and the Adverse Event CRF.
9.5.4.4
Expedited Reporting
The sponsor must inform investigator and regulatory authorities of reportable events, in 
compliance with applicable regulatory requirements, on an expedited basis (ie, within 
specific time frames).  For this reason, it is imperative that sites provide complete SAE 
information in the manner described above.
9.5.4.5
Breaking the Blind
Not applicable
9.5.4.6
Regulatory Reporting of Adverse Events
Adverse events will be reported by the sponsor or a third party acting on behalf of the 
sponsor to regulatory authorities in compliance with local and regional law and established 
guidance.  The format of these reports will be dictated by local and regional requirements.
9.5.5
Completion/Discontinuation of Subjects
The investigator may withdraw the subject from the study at any time for safety or 
administrative reasons.  A subject may elect to discontinue the study at any time for any 
reason.  All subjects who discontinue the study are to complete the study’s early 
discontinuation procedures indicated in the Schedule of Procedures/Assessments (Table 3).
The investigator will promptly explain to the subject involved that the study will be 
discontinued for that subject and provide appropriate medical treatment and other necessary 
measures for the subject.  A subject who has ceased to return for visits will be followed up by 
mail, phone, or other means to gather information such as the reason for failure to return, the 
status of treatment compliance, the presence or absence of AEs, and clinical courses of signs 
and symptoms.
Subjects who discontinue early from the study will be discontinued for 1 of these primary 
reasons: AE(s), lost to follow-up, subject choice, withdrawal of consent, pregnancy, study 
terminated by sponsor, or other.  In addition to the primary reason, the subject may indicate 1 
or more of secondary reasons for discontinuation.  Study disposition information will be 
collected on the Subject Disposition CRF.
A subject removed from the study for any reason may be replaced.
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9.5.6
Confirmation of Medical Care by Another Physician (for Renal Impairment 
Subjects):
The investigator will instruct subjects to inform site personnel when they are planning to 
receive medical care by another physician.  At each visit, the investigator will ask the subject 
whether he/she has received medical care by another physician since the last visit or is 
planning to do so in the future.  When the subject is going to receive medical care by another 
physician, the investigator, with the consent of the subject, will inform the other physician 
that the subject is participating in the clinical study.
9.6
Data Quality Assurance
This study will be organized, performed, and reported in compliance with the protocol, 
SOPs, working practice documents, and applicable regulations and guidelines.  Site audits 
may be made periodically by the sponsor’s or the CRO’s qualified compliance auditing team, 
which is an independent function from the study team responsible for conduct of the study.  
9.6.1
Data Collection
Data required by the protocol will be collected on the CRFs and entered into a validated data 
management system that is compliant with all regulatory requirements.  As defined by ICH 
guidelines, the CRF is a printed, optical, or electronic document designed to record all of the 
protocol-required information to be reported to the sponsor on each study subject.
Data collection on the CRF must follow the instructions described in the CRF Completion 
Guidelines.  The investigator has ultimate responsibility for the collection and reporting of all 
clinical data entered on the CRF.  The investigator or designee as identified on Form FDA 
1572 must sign the completed CRF to attest to its accuracy, authenticity, and completeness.
Completed, original CRFs are the sole property of Eisai and should not be made available in 
any form to third parties without written permission from Eisai, except for authorized 
representatives of Eisai or appropriate regulatory authorities.
9.6.2
Clinical Data Management
All software applications used in the collection of data will be properly validated following 
standard computer system validation that is compliant with all regulatory requirements.  All 
data, both CRF and external data (eg, laboratory data), will be entered into a clinical system.
9.7
Statistical Methods
All statistical analyses will be performed by the sponsor or designee after the study is 
completed and the database is locked and released. Statistical analyses will be performed 
using WinNonlin and SAS software or other validated statistical software as required.  
Details of the statistical analyses will be included in a separate statistical analysis plan (SAP).
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9.7.1
Statistical and Analytical Plans
The statistical analyses of study data are described in this section.  Further details of the 
analytical plan will be provided in the SAP, which will be finalized before database lock.
9.7.1.1
Study Endpoints
The endpoints include the following PK parameters derived by non-compartmental analysis 
using the plasma concentration-time data of lemborexant and its metabolites:
Cmax
Maximum plasma drug concentration
tmax
Time to reach maximum plasma concentration
AUC(0-t)
Area under plasma concentration vs. time curve from time = 0 
to time of last quantifiable concentration 
AUC(0-inf)
Area under plasma concentration vs. time curve from time = 0 
to infinity
t1/2
Terminal phase plasma half-life
CL/F
Apparent total body clearance ( for lemborexant only)
Vz/F
Apparent volume of distribution (for lemborexant only)
AUC Metabolite 
Ratio
Ratio of AUC(0-inf) of individual metabolite to AUC(0-inf) of 
lemborexant, corrected for molecular weights
fu
Plasma protein unbound fraction
AUCu
AUC(0-inf) values adjusted by unbound fraction in plasma 
(for lemborexant only)
CLu/F
Apparent clearance relative to the unbound plasma concentration 
based on AUCu (for lemborexant only)
The Cmax, AUC(0-t), and AUC(0-inf) of lemborexant will be the primary PK endpoints.  The rest 
of the parameters, including the PK parameters of the metabolites, will be secondary 
endpoints.
9.7.1.2
Definitions of Analysis Sets
The Safety Analysis Set is the group of subjects who dosed with the test drug and had at least 
1 postdose safety assessment.
The Pharmacokinetic Analysis Set is the group of subjects who dosed with the test drug and 
had sufficient PK data to derive at least 1 PK parameter.
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9.7.1.3
Subject Disposition
9.7.1.4
Demographic and Other Baseline Characteristics
Demographic and other baseline characteristics for the safety analysis set will be summarized 
for each treatment group using descriptive statistics.  Continuous demographic and baseline 
variables include age, weight, height, BMI, eGFR and CLcr; categorical variables include 
sex, ethnicity and race.
9.7.1.5
Prior and Concomitant Therapy
All investigator terms for medications recorded in the CRF will be coded to an 11-digit code 
using the World Health Organization Drug Dictionary (WHO DD, March 2017), drug code.  
Prior medications will be defined as medications that stopped before the dose of study drug.  
Any medication (including OTC medications) or therapy administered to the subject during 
the study (starting at the date of informed consent) will be recorded on the Prior and
Concomitant Medication CRF or Non-Pharmacological Procedures CRF. All medications 
will be presented in subject data listings.
9.7.1.6
Efficacy Analyses
Not applicable.
9.7.1.7
Pharmacokinetic, Pharmacodynamic, Pharmacogenomic, and Other Biomarker
Analyses
9.7.1.7.1
PHARMACOKINETIC ANALYSES
The Safety Analysis Set will be used for individual plasma concentration listings.  The PK 
Analysis Set will be used for summaries of plasma concentrations and for analyses, 
summaries, and listings of PK parameters.
The effect of renal impairment on the PK of lemborexant will be assessed using a linear 
model with renal impairment group as a factor.  Logarithmically transformed values of the 
primary PK parameters Cmax, AUC(0-t), and AUC(0-inf) will be utilized to estimate the 
geometric mean ratio (and two-sided 90% confidence intervals [CIs]) of subjects with severe 
renal impairment versus subjects with normal renal function.  Similar statistical analyses will 
be conducted for the PK parameters of the metabolites and unbound lemborexant. Protein 
binding will be conducted for metabolites without any assessment of PK parameters.  In 
addition, summary statistics for PK parameters in each renal function group will be tabulated.
If the 90% confidence intervals indicate that there is an effect of renal impairment on the 
primary PK parameters, relationships between the individual subject PK parameters (Cmax, 
AUC(0-t), AUC(0-inf), and CL/F, both free and total) and individual subject estimated renal 
function (eGFR estimated by the MDRD) will be explored utilizing linear regression models 
with log-transformed PK parameters as the dependent variable and estimated renal function 
as the independent variable. (revised per Amendment 01) Point estimates and 95% CIs of the 
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intercept and slope will be presented.  The relationship between each of the PK parameters 
and the estimated renal function will be also presented graphically.
9.7.1.7.2
PHARMACODYNAMIC, PHARMACOGENOMIC, AND OTHER BIOMARKER ANALYSES
Not applicable. 
9.7.1.8
Safety Analyses
An evaluation of safety will be performed on the Safety Analysis Set.  Safety data that will 
be evaluated include AEs, clinical laboratory results, vital signs, and ECGs.
Treatment-emergent adverse events (TEAEs) will be summarized for each group.  
Descriptive summary statistics (eg, mean, standard deviation [SD], median, minimum, 
maximum for continuous variables, and number and percentage for categorical variables) 
including shift tables of the laboratory and vital signs data.  Changes from baseline for the 
clinical laboratory, vital signs, and ECG parameters will be evaluated for subjects with renal 
impairment and healthy controls by time point.
9.7.1.8.1
EXTENT OF EXPOSURE
All subjects enrolled in the study will receive a single 10 mg dose (1 × 10 mg lemborexant 
tablet) in the morning after an overnight fast.
9.7.1.8.2
ADVERSE EVENTS
The AE verbatim descriptions (investigator terms from the CRF) will be classified into 
standardized medical terminology using the Medical Dictionary for Regulatory Activities 
(MedDRA).  Adverse events will be coded to the MedDRA (Version 20.1 or higher) lower 
level term (LLT) closest to the verbatim term.  The linked MedDRA preferred term (PT) and 
primary system organ class (SOC) are also captured in the database.
A treatment-emergent adverse event (TEAE) is defined as an AE that emerges during 
treatment, having been absent at pretreatment (Baseline) or 
•
Reemerges during treatment, having been present at pretreatment (Baseline) but stopped
before treatment, or 
•
Worsens in severity during treatment relative to the pretreatment state, when the AE is
continuous.
Only those AEs that were treatment emergent will be included in summary tables.  All AEs, 
treatment emergent or otherwise, will be presented in subject data listings.
The TEAEs will be summarized by group.  The incidence of TEAEs will be reported as the 
number (percentage) of subjects with TEAEs by SOC and PT.  A subject will be counted 
only once within a SOC and PT, even if the subject experienced more than 1 TEAE within a 
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specific SOC and PT.  The number (percentage) of subjects with TEAEs will also be 
summarized by maximum severity (mild, moderate, or severe).
The number (percentage) of subjects with TEAEs will also be summarized by relationship to 
study drug (Yes [related] and No [not related]).
Subject data listings of AEs, TEAEs leading to death, SAEs, and AEs leading to withdrawal 
will be provided.
9.7.1.8.3
LABORATORY VALUES
Laboratory results will be summarized using Système International (SI) units, as appropriate.  
For all quantitative parameters listed in Section 9.5.1.5.3, the actual value and the change 
from baseline to each postbaseline visit and to the end of treatment (defined as the last 
on-treatment value) will be summarized by visit and group using descriptive statistics.  
Qualitative parameters listed in Section 9.5.1.5.3 will be summarized using frequencies 
(number and percentage of subjects), and changes from baseline to each postbaseline visit 
and to end of treatment will be reported using shift tables.  Percentages will be based on the 
number of subjects with both nonmissing baseline and relevant postbaseline results.
Laboratory test results will be assigned a low/normal/high (LNH) classification according to 
whether the value was below (L), within (N), or above (H) the laboratory parameter’s 
reference range.  Within-group comparisons for each laboratory parameter will be based on 
3-by-3 tables (shift tables) that compare the baseline LNH classification to the LNH 
classification at each postbaseline visit and at the end of treatment.  
Clinical laboratory results post baseline will be evaluated for markedly abnormal values.
Appendix 1, presents the Sponsor’s Grading for Laboratory Values that will be used to 
identify subjects with markedly abnormal laboratory values.
9.7.1.8.4
VITAL SIGNS
Descriptive statistics for vital signs parameters (ie, diastolic and systolic BP, pulse, 
respiratory rate, temperature, weight) and changes from baseline will be presented by day 
and time after dosing and group.
9.7.1.8.5
ELECTROCARDIOGRAMS
Shift tables will present changes from baseline in ECG interpretation (categorized as normal; 
abnormal, not clinically significant; and abnormal, clinically significant) to end of treatment.
9.7.2
Determination of Sample Size
A sample size of 8 subjects for each group is based on the recommendations in FDA 
Guidance (FDA, 2010), and should provide estimates to assess whether dose adjustment is 
required for subjects with renal impairment. 
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Based on data from single dose studies of the 10 mg tablet (E2006-A001-004, 
E2006-A001-005, and E2006-A001-008), the pooled between-subject standard deviation of 
logarithmically transformed AUC(0-inf) values of  lemborexant is 0.391.  With a sample size 
of 8 subjects with severe renal impairment and 8 matched controls, the 2-sided 90% CI for 
the geometric mean ratio for AUC(0-inf) would extend from 0.72 to 1.38 (for a mean ratio of 
1.0).  Similar precision is expected for the 2-sided 90% CI for the ratio for AUC(0-t).
9.7.3
Interim Analysis
No interim analysis is planned for this study.
9.7.4
Other Statistical/Analytical Issues
Not applicable.
9.7.5
Procedure for Revising the Statistical Analysis Plan
If the SAP needs to be revised after the study starts, the sponsor will determine how the 
revision impacts the study and how the revision should be implemented.  The details of the 
revision will be documented and described in the clinical study report.
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10 REFERENCE LIST
1. Food and Drug Administration. Guidance for Industry Pharmacokinetics in Patients 
with Impaired Renal Function: Study Design, Data Analysis, and Impact on Dosing 
and Labeling Draft Guidance, March 2010, Revision 1.
2. Note for Guidance on the Evaluation of the Pharmacokinetics of Medicinal Products 
in Patients with Impaired Renal Function. European Medicines Agency (EMA), 
Committee for Medicinal Products for Human Use (CHMP). Adopted 22-23 June 
2004.  
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11 PROCEDURES 
AND 
INSTRUCTIONS 
(ADMINISTRATIVE 
PROCEDURES)
Any change to the protocol requires a written protocol amendment or administrative change 
that must be approved by the sponsor before implementation.  Amendments specifically 
affecting the safety of subjects, the scope of the investigation, or the scientific quality of the 
study require additional approval by the applicable IRBs/IECs.  These requirements should in 
no way prevent any immediate action from being taken by the investigator, or by the sponsor, 
in the interest of preserving the safety of all subjects included in the study.  If the investigator 
determines that an immediate change to or deviation from the protocol is necessary for safety 
reasons to eliminate an immediate hazard to the subjects, the sponsor’s medical monitor and 
the IRB/IEC for the site must be notified immediately.  The sponsor must notify the health or 
regulatory authority as required per local regulations.
Protocol amendments that affect only administrative aspects of the study may not require 
submission to health or regulatory authority or the IRB/IEC, but the health or regulatory 
authority and IRB/IEC should be kept informed of such changes as required by local 
regulations.  In these cases, the sponsor may be required to send a letter to the IRB/IEC and 
the Competent Authorities detailing such changes.
11.1
Adherence to the Protocol
The investigator will conduct the study in strict accordance with the protocol (refer to ICH 
E6, Section 4.5).
11.2
Monitoring Procedures
The sponsor’s/CRO’s CRA will maintain contact with the investigator and designated staff 
by telephone, letter, or email between study visits.  Monitoring visits to each site will be 
conducted by the assigned CRA as described in the monitoring plan.  The investigator will 
allow the CRA to inspect the clinical, laboratory, and pharmacy facilities to assure 
compliance with GCP and local regulatory requirements.  The CRFs and subject’s 
corresponding original medical records (source documents) are to be fully available for 
review by the sponsor’s representatives at regular intervals. These reviews verify adherence 
to study protocol and data accuracy in accordance with local regulations.  All records at the 
site are subject to inspection by the local auditing agency and IRB/IEC review.
In accordance with ICH E6, Section 1.52, source documents include, but are not limited to 
the following:
•
Clinic, office, or hospital charts
•
Copies or transcribed health care provider notes which have been certified for accuracy 
after production
•
Recorded data from automated instruments such as IxRS, x-rays, and other imaging 
reports, (eg, sonograms, CT scans, magnetic resonance images, radioactive images, 
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ECGs, rhythm strips, EEGs, polysomnographs, pulmonary function tests) regardless of 
how these images are stored, including microfiche and photographic negatives
•
Pain, quality of life, or medical history questionnaires completed by subjects
•
Records of telephone contacts
•
Diaries or evaluation checklists
•
Drug distribution and accountability logs maintained in pharmacies or by research 
personnel
•
Laboratory results and other laboratory test outputs (eg, urine pregnancy test result 
documentation and urine dip-sticks)
•
Correspondence regarding a study subject’s treatment between physicians or memoranda 
sent to the IRBs/IECs
•
CRF components (eg, questionnaires) that are completed directly by subjects and serve as 
their own source
11.3
Recording of Data
A CRF is required and must be completed for each subject by qualified and authorized 
personnel.  All data on the CRF must reflect the corresponding source document, except 
when a section of the CRF itself is used as source document.  Any correction to entries made 
on the CRF must be documented in a valid audit trail where the correction is dated, the 
individual making the correct is identified, the reason for the change is stated, and the 
original data are not obscured.  Only data required by the protocol for the purposes of the 
study should be collected.
The investigator must sign each CRF.  The investigator will report the CRFs to the sponsor 
and retain a copy of the CRFs.
11.4
Identification of Source Data
All data to be recorded on the CRF must reflect the corresponding source documents.
11.5
Retention of Records
The circumstances of completion or termination of the study notwithstanding, the 
investigator is responsible for retaining all study documents, including but not limited to the 
protocol, copies of CRFs, the Investigator's Brochure, and regulatory agency registration 
documents (eg, Form FDA 1572, ICFs, and IRB/IEC correspondence).  The site should plan 
to retain study documents, as directed by the sponsor, for at least 2 years after the last 
approval of a marketing application in an ICH region and until there are no pending or 
contemplated marketing applications in an ICH region or at least 3 years have elapsed since 
the formal discontinuation of clinical development of the investigational product.
It is requested that at the completion of the required retention period, or should the 
investigator retire or relocate, the investigator contact the sponsor, allowing the sponsor the 
option of permanently retaining the study records.
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11.6
Auditing Procedures and Inspection
In addition to the routine monitoring procedures, the sponsor’s Clinical Quality Assurance 
department conducts audits of clinical research activities in accordance with the sponsor’s 
SOPs to evaluate compliance with the principles of ICH GCP and all applicable local 
regulations. If a government regulatory authority requests an inspection during the study or 
after its completion, the investigator must inform the sponsor immediately.
11.7
Handling of Study Drug
All study drug will be supplied to the principal investigator (or a designated pharmacist) by 
the sponsor or designee.  Drug supplies must be kept in an appropriate secure area (eg,
locked cabinet) and stored according to the conditions specified on the drug labels.  The 
investigator (or a designated pharmacist) must maintain an accurate record of the shipment 
and dispensing of the study drug in a drug accountability ledger, a copy of which must be 
given to the sponsor at the end of the study.  An accurate record of the date and amount of 
study drug dispensed to each subject must be available for inspection at any time.  The CRA 
will visit the site and review these documents along with all other study conduct documents 
at appropriate intervals once study drug has been received by the site.
All drug supplies are to be used only for this study and not for any other purpose.  The 
investigator (or site personnel) must not destroy any drug labels or any partly used or unused 
drug supply before approval to do so by the sponsor.  At the conclusion of the study and as 
appropriate during the study, the investigator (or a designated pharmacist) will return all used 
and unused drug containers, drug labels, and a copy of the completed drug disposition form 
to the sponsor’s CRA or designee, when approval is given by the sponsor, the investigator (or 
a designated pharmacist) will destroy supplies and containers at the site.
11.8
Publication of Results
All manuscripts, abstracts, or other modes of presentation arising from the results of the 
study must be reviewed and approved in writing by the sponsor in advance of submission 
pursuant to the terms and conditions set forth in the executed Clinical Trial Agreement 
between the sponsor/CRO and the institution/investigator.  The review is aimed at protecting 
the sponsor's proprietary information existing either at the date of the commencement of the 
study or generated during the study.
The detailed obligations regarding the publication of any data, material results, or other 
information, generated or created in relation to the study shall be set out in the agreement 
between each investigator and the sponsor or CRO, as appropriate.
11.9
Disclosure and Confidentiality
The contents of this protocol and any amendments and results obtained during the study 
should be kept confidential by the investigator, the investigator’s staff, and the IRB/IEC and 
will not be disclosed in whole or in part to others, or used for any purpose other than 
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reviewing or performing the study, without the written consent of the sponsor.  No data 
collected as part of this study will be used in any written work, including publications, 
without the written consent of the sponsor.  These obligations of confidentiality and non-use 
shall in no way diminish such obligations as set forth in either the Confidentiality Agreement 
or 
Clinical 
Trial 
Agreement 
executed 
between 
the 
sponsor/CRO 
and 
the 
institution/investigator.
All persons assisting in the performance of this study must be bound by the obligations of 
confidentiality and non-use set forth in either the Confidentiality Agreement or Clinical Trial 
Agreement executed between the institution/investigator and the sponsor/CRO.
11.10 Discontinuation of Study
The sponsor reserves the right to discontinue the study for medical reasons or any other 
reason at any time.  If a study is prematurely terminated or suspended, the sponsor will 
promptly inform the investigators/institutions and regulatory authorities of the termination or 
suspension and the reason(s) for the termination or suspension.  The IRB/IEC will also be 
informed promptly and provided the reason(s) for the termination or suspension by the 
sponsor or by the investigator/institution, as specified by the applicable regulatory 
requirement(s).
The investigator reserves the right to discontinue the study should his/her judgment so 
dictate.  If the investigator terminates or suspends a study without prior agreement of the 
sponsor, the investigator should inform
the institution where applicable, and the 
investigator/institution should promptly inform the sponsor and the IRB/IEC and provide the 
sponsor and the IRB/IEC with a detailed written explanation of the termination or 
suspension.  Study records must be retained as noted above.
11.11 Subject Insurance and Indemnity
The sponsor will provide insurance for any subjects participating in the study in accordance 
with all applicable laws and regulations.
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12 APPENDICES
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Appendix 1
Sponsor’s Grading for Laboratory Values
Sponsor’s Grading for Laboratory Values
Grade 1
Grade 2
Grade 3
Grade 4
BLOOD/BONE MARROW
Hemoglobin  
<LLN – 10.0 g/dL
<LLN – 100 g/L
<LLN – 6.2 mmol/L
<10.0 – 8.0 g/dL
<100 – 80 g/L
<6.2 – 4.9 mmol/L 
<8.0 g/dL
<80 g/L
<4.9 mmol/L;
transfusion indicated
life-threatening 
consequences; urgent 
intervention indicated
Leukocytes (total WBC)
<LLN – 3.0109/L
<LLN – 3000/mm3
<3.0 – 2.0109/L
<3000 – 2000/mm3
<2.0 – 1.0109/L
<2000 – 1000/mm3
<1.0109/L
<1000/mm3 
Lymphocytes 
<LLN – 800/mm3 
<LLN – 0.8109/L
<800 – 500/mm3
<0.8 – 0.5109/L
<500 – 200/mm3
<0.5 – 0.2109/L
<200/mm3
<0.2109/L
Neutrophils 
<LLN – 1.5109/L
<LLN – 1500/mm3
<1.5 – 1.0109/L
<1500 – 1000/mm3
<1.0 – 0.5109/L
<1000 – 500/mm3 
<0.5109/L
<500/mm3 
Platelets
<LLN – 75.0109/L
<LLN – 75,000/mm3
<75.0 – 50.0109/L
<75,000 – 50,000/mm3
<50.0 – 25.0109/L
<50,000 – 25,000/mm3
<25.0109/L
<25,000/mm3
METABOLIC/LABORATORY
Albumin, serum- low 
(hypoalbuminemia) 
<LLN – 3 g/dL
<LLN – 30 g/L
<3 – 2 g/dL
<30 – 20 g/L
<2 g/dL
<20 g/L
life-threatening 
consequences; urgent 
intervention indicated
Alkaline phosphatase 
>ULN – 3.0ULN
>3.0 – 5.0ULN
>5.0 – 20.0ULN
>20.0ULN
ALT
>ULN – 3.0ULN
>3.0 – 5.0ULN
>5.0 – 20.0ULN
>20.0ULN
AST
>ULN – 3.0ULN
>3.0 – 5.0ULN
>5.0 – 20.0ULN
>20.0ULN
Bilirubin (hyperbilirubinemia)
>ULN – 1.5ULN 
>1.5 – 3.0ULN
>3.0 – 10.0ULN 
>10.0ULN
Calcium, serum-low (hypocalcemia) 
<LLN – 8.0 mg/dL
<LLN – 2.0 mmol/L
<8.0 – 7.0 mg/dL
<2.0 – 1.75 mmol/L
<7.0 – 6.0 mg/dL
<1.75 – 1.5 mmol/L
<6.0 mg/dL
<1.5 mmol/L
Calcium, serum-high (hypercalcemia)
>ULN – 11.5 mg/dL
>ULN – 2.9 mmol/L
>11.5 – 12.5 mg/dL
>2.9 – 3.1 mmol/L
>12.5 – 13.5 mg/dL
>3.1 – 3.4 mmol/L
>13.5 mg/dL
>3.4 mmol/L
Cholesterol, serum-high 
(hypercholesterolemia)
>ULN – 300 mg/dL
>ULN – 7.75 mmol/L 
>300 – 400 mg/dL
>7.75 – 10.34 mmol/L 
>400 – 500 mg/dL
>10.34 – 12.92 mmol/L 
>500 mg/dL
>12.92 mmol/L 
Creatinine
>ULN – 1.5ULN
>1.5 – 3.0ULN
>3.0 – 6.0ULN
>6.0ULN
GGT (γ-glutamyl transpeptidase) 
>ULN – 3.0ULN
>3.0 – 5.0ULN
>5.0 – 20.0ULN
>20.0ULN
Glucose, serum-high (hyperglycemia)
Fasting glucose value:
>ULN – 160 mg/dL
>ULN – 8.9 mmol/L 
Fasting glucose value:
>160 – 250 mg/dL
>8.9 – 13.9 mmol/L 
>250 – 500 mg/dL;
>13.9 – 27.8 mmol/L;
hospitalization indicated
>500 mg/dL;
>27.8 mmol/L;
life-threatening 
consequences 
Glucose, serum-low (hypoglycemia)
<LLN – 55 mg/dL
<LLN – 3.0 mmol/L
<55 – 40 mg/dL
<3.0 – 2.2 mmol/L
<40 – 30 mg/dL
<2.2 – 1.7 mmol/L
<30 mg/dL
<1.7 mmol/L
life-threatening 
consequences; 
seizures
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Sponsor’s Grading for Laboratory Values
Grade 1
Grade 2
Grade 3
Grade 4
Phosphate, serum-low 
(hypophosphatemia) 
<LLN – 2.5 mg/dL
<LLN – 0.8 mmol/L
<2.5 – 2.0 mg/dL
<0.8 – 0.6 mmol/L
<2.0 – 1.0 mg/dL
<0.6 – 0.3 mmol/L
<1.0 mg/dL
<0.3 mmol/L
life-threatening 
consequences
Potassium, serum-high (hyperkalemia)
>ULN – 5.5 mmol/L 
>5.5 – 6.0 mmol/L
>6.0 – 7.0 mmol/L
hospitalization indicated
>7.0 mmol/L
life-threatening 
consequences
Potassium, serum-low (hypokalemia) 
<LLN – 3.0 mmol/L
<LLN – 3.0 mmol/L; 
symptomatic; 
intervention indicated
<3.0 – 2.5 mmol/L
hospitalization indicated
<2.5 mmol/L
life-threatening 
consequences
Sodium, serum-high (hypernatremia)
>ULN – 150 mmol/L
>150 – 155 mmol/L
>155 – 160 mmol/L
hospitalization indicated
>160 mmol/L
life-threatening 
consequences
Sodium, serum-low (hyponatremia)
<LLN – 130 mmol/L
N/A
<130 – 120 mmol/L
<120 mmol/L
life-threatening 
consequences
Triglyceride, serum-high 
(hypertriglyceridemia) 
150 – 300 mg/dL
1.71 – 3.42 mmol/L
>300 – 500 mg/dL
>3.42 – 5.7 mmol/L 
>500 – 1000 mg/dL
>5.7 – 11.4 mmol/L
>1000 mg/dL
>11.4 mmol/L
life-threatening 
consequences 
Uric acid, serum-high (hyperuricemia)
>ULN – 10 mg/dL 
≤0.59 mmol/L without 
physiologic 
consequences 
N/A
>ULN 
–
10 
mg/dL 
≤0.59 
mmol/L 
with 
physiologic 
consequences 
>10 mg/dL
>0.59 mmol/L 
life-threatening 
consequences
ALT = alanine aminotransferase (serum glutamic pyruvic transaminase), AST = aspartate aminotransferase (serum glutamic oxaloacetic 
transaminase), GGT = γ-glutamyl transpeptidase, N/A = not applicable, LLN = lower limit of normal, ULN = upper limit of normal, WBC = 
white blood cell.
Based on Common Terminology Criteria for Adverse events (CTCAE) Version 4.0.  Published: May 28, 2009 (v4.03: June 14, 2010).
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Appendix 2
List of Prohibited Concomitant Medications
If a medication is not presented in the list below, but does fit into a class of medications
noted in the list, the medical monitor must be consulted to determine whether it is
permitted.
Category
Medication
Anticholinergics(centrally-acting)
-
Anticonvulsants with known sedating effects
Barbiturates
Benzodiazepines
GABA analogues
Hydantoins
Phenyltriazines
Antihistamines (centrally-acting H1, including over-the-
counter)

DiphenhydramineHCl

Carbinoxamine

Doxylamine

Dimenhyrinate

Triprolidine

Bromopheniramine

Chlorphemamine

Hydroxazine
Antihistamines with known sedating effects

Non-sedating, eg, loratadine is
not prohibited
Anxiolytics with known sedating effects

Lorazepam

Alprazolam

Buspirone
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Category
Medication
Strong CYP3A inhibitors
Amiodarone
Boceprevir
Clarithomycin
Cobicistat
Conivaptan
Danoprevir
Eltegravir
Fluvoxamine
Idelalisib Indinavir
Itraconazole
Ketoconazole
Lopinavir
Mibefradil
Nefazodone
Nelfinavir
Posaconazole
Ritonavir
Saquinavir
Telaprevir
Telithromycin
Tipranavir
Troleandomycin
Voriconazole
Moderate CYP3A inhibitors
Amprenavir
Aprepitant
Atazanavir
Casopitant
Cimetidine
Ciprofloxacin
Crizotinib
Cyclosporine
Darunavir
Diltiazem
Dronedarone
Erythromycin
Faldaprevir
Fluconazole
Imatinib
Netupitant
Verampamil
Clinical Study Report 
E2006-A001-105 
Eisai 
FINAL (V 1.0): 27 Nov 2018
Confidential
Page 60 of 128

Clinical Study Protocol
(Per Amendment 01)
E2006-A001-105
Eisai
FINAL (V.2.0): 02 Apr 2018
Confidential
Page 61 of 64
Category
Medication
CYP3A inducers
Avasimibe
Carbamazepine
Enzalutamide
Phenobarbital
Phenytoin
Rifabutin
Rifampin
St John’s Wort Extract
Bosentan
Efavirenz
Etravirine
Lersivirine
Modafinil
Nafcillin
Talviraline
Thioridazine
Hypnotics
Melatonin
Prescribed or OTC
Herbal preparations with sedating effects
-
MAOIs
-
Opioid Analgesics
-
Muscle relaxants (centrally-acting) with known
GABA analogues
Hydantoins
Phenyltriazines
sedating effects
Stimulants
Amphetamines
Modafinil
Armodafinil
Methylphenidate
Other
Warfarin, heparin, ticlopidine
Non-stimulant diet pills
Systemic isoretinoin
Systemicglucocorticoids
Tryptophan
Clinical Study Report 
E2006-A001-105 
Eisai 
FINAL (V 1.0): 27 Nov 2018
Confidential
Page 61 of 128

Clinical Study Protocol
(Per Amendment 01)
E2006-A001-105
Eisai
FINAL (V.2.0): 02 Apr 2018
Confidential
Page 62 of 64
PROTOCOL SIGNATURE PAGE
Study Protocol Number:
E2006-A001-105
Study Protocol Title:
An Open-label, Parallel-Group Study to Evaluate the 
Pharmacokinetics of Lemborexant and Its Metabolites in 
Subjects with Normal Renal Function or with Severe Renal 
Impairment
Investigational Product 
Name:
E2006/Lemborexant
IND Number:
111871
SIGNATURES
Authors:
Neurology Business Group
Eisai Inc.
               ____________________________________________________
 
Neurology Business Group 
Eisai Inc.
Eisai Inc.
Date
Date
Date
Clinical Study Report 
E2006-A001-105 
Eisai 
FINAL (V 1.0): 27 Nov 2018
Confidential
Page 62 of 128
PPD
PPD
PPD
PPD
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Clinical Study Protocol 
(Per Amendment 01) 
INVESTIGATOR SIGNATURE PAGE 
Study Protocol Number: E2006-A001-105 
E2006-AOO 1-105 
Study Protocol Title: 
An Open-label, Parallel-Group Study to Evaluate the 
Phannacokinetics of Lemborexant and Its Metabolites in 
Subjects with Normal Renal Function or with Severe Renal 
Impairment 
Investigational Product E2006/Lemborexant 
Name: 
IND Number: 
111871 
I have read this protocol and agree to conduct this study in accordance with all stipulations of 
the protocol and in accordance with International Council for Harmonisation of Technical 
Requirements for Pharmaceuticals for Human Use (ICH) and· all applicable local Good 
Clinical Practice (GCP) guidelines, including the Declaration of Helsinki. 
Clinical Pharmacology of Miami, LLC., Evolution Research Group 
Medical Institution 
Kenneth C. Lasseter, MD 
Investigator 
FINAL (V.2.0): 02 Apr 2018 
Clinical Study Report 
E2006-A001-105 
Eisai 
FINAL (V 1.0): 27 Nov 2018
Confidential
Page 63 of 128
PPD

Clinical Study Protocol 
(Per Amendment 0 l) 
Study Protocol Number: 
Study Protocol 
E'.:'.006-AOO 1-105 
E2006-A001-!05 
An Open-label, Parallel-Group Study to Evaluate the 
Pharmacokinetics of Lemborexant and Its M.etabolites in 
with Normal Renal Function or with Severe Renal 
Impainnent 
E2006/Lemborexant 
l l 1871 
l have read this protocol and agree to conduct this study in accordance 
stipulations 
the protocol and in accordance with International Council for Hannonisation of Technical 
Requirements for Pharmaceuticals for Human Use (ICH) and all applicable local Good 
Clinical Practice 
including the Declaration of r:1c:1s1r1K1. 
Orlando Clinical 
Medical Institution 
Investigator 
Signature 
Eisai 
Confidential 
64 of64 
FlNAL 
2.0): 02 
201& 
Clinical Study Report 
E2006-A001-105 
Eisai 
FINAL (V 1.0): 27 Nov 2018
Confidential
Page 64 of 128
PPD