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Vibegron

Phase 2

Urinary Bladder, Overactive | Small molecule | Nephrology |Merck & Company, Inc.|Last Updated: Feb 4, 2019

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDBiomarker
Total Trials1
Total Enrollment1,395
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT01314872A Study of the Efficacy and Safety of Vibegron (MK-4618) in Participants With Overactive Bladder (OAB) (MK-4618-008)PHASE2 COMPLETED 1,395Mar 31, 2011Oct 10, 2013Feb 4, 2019 -
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Study Endpoints
Primary Endpoints
Base Study/Part 1: Change From Baseline in Average Daily Micturitions at Week 8
Baseline and Week 8

Participants were required to keep a voiding diary, recording the occurrence of each micturition. The average daily number of micturitions was calculated as the total number of micturitions that occurred over a week (4 to 10 days) during the Base Study, divided by the total number of days of voiding kept in the participant's diary. Baseline was defined as the average daily number of daily micturitions that occurred during the week of placebo run-in prior to Week 0 visit.

Base Study/Part 1 + Part 2: Number of Participants Who Experienced an Adverse Event (AE)
Part 1: up to 8 weeks; Part 2: up to 4 weeks. The time frame was an additional 2 weeks for participants not continuing to the Extension Study.

An AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a study drug, whether or not it is considered related to the study drug.

Base Study/Part 1 + Part 2: Number of Participants Who Had Study Medication Withdrawn Due to an AE
Part 1: up to 8 weeks; Part 2: up to 4 weeks

An AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a study drug, whether or not it is considered related to the study drug.

Extension Study: Number of Participants Who Experienced an Adverse Event (AE)
Extension: up to 54 weeks (including 2-week follow-up)

An AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a study drug, whether or not it is considered related to the study drug.

Extension Study: Number of Participants Who Had Study Medication Withdrawn Due to an AE
Extension: up to 52 weeks

An AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a study drug, whether or not it is considered related to the study drug.

Secondary Endpoints
Base Study/Part 1: Change From Baseline in Number of Urge Incontinence Episodes at Week 8
Baseline and Week 8
Base Study/Part 1: Change From Baseline in Average Daily Number of Total Incontinence Episodes at Week 8
Baseline and Week 8
Base Study/Part 1: Change From Baseline in Average Daily Number of Strong Urge Episodes at Week 8
Baseline and Week 8
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1: placeboPLACEBO_COMPARATORParticipants received two placebo matching vibegron tablets and one placebo matching tolterodine extended release (ER) capsule, taken orally each morning, for 8 weeks.
Part 1: vibegron 3 mgEXPERIMENTALParticipants received one vibegron 3 mg tablet, one placebo matching vibegron tablet, and one placebo matching tolterodine ER capsule, taken orally each morning, for 8 weeks.
Part 1: vibegron 15 mgEXPERIMENTALParticipants received one vibegron 15 mg tablet, one placebo matching vibegron tablet, and one placebo matching tolterodine ER capsule, taken orally each morning, for 8 weeks.
Part 1: vibegron 50 mgEXPERIMENTALParticipants received one vibegron 50 mg tablet, one placebo matching vibegron tablet, and one placebo matching tolterodine ER capsule, taken orally each morning, for 8 weeks.
Part 1: vibegron 100 mgEXPERIMENTALParticipants received two vibegron 50 mg tablets and one placebo matching tolterodine ER capsule, taken orally each morning, for 8 weeks.
Part 1: tolterodine ER 4 mgACTIVE_COMPARATORParticipants received one tolterodine ER 4 mg capsule and two placebo matching vibegron tablets, taken orally each morning, for 8 weeks.
Part 1: vibegron 50 mg + tolterodine ER 4 mg/vibegron 50 mgEXPERIMENTALParticipants received one vibegron 50 mg tablet and one placebo matching vibegron tablet, taken orally each morning, for 8 weeks. They also received one tolterodine ER 4 mg capsule for the first 4 weeks and one placebo matching tolterodine ER capsule for the second 4 weeks, both taken orally each morning.
Part 2: placeboPLACEBO_COMPARATORParticipants received two placebo matching vibegron tablets and one placebo matching tolterodine ER capsule, taken orally each morning, for 4 weeks.
Part 2: vibegron 100 mgEXPERIMENTALParticipants received two vibegron 50 mg tablets and one placebo matching tolterodine ER capsule, taken orally each morning, for 4 weeks.
Part 2: tolterodine ER 4 mgACTIVE_COMPARATORParticipants received one tolterodine ER 4 mg capsule and two placebo matching vibegron tablets, taken orally each morning, for 4 weeks.
Part 2: vibegron 100 mg + tolterodine ER 4 mgEXPERIMENTALParticipants received two vibegron 50 mg tablets and one tolterodine ER 4 mg capsule, taken orally each morning, for 4 weeks.
Extension Study: vibegron 50 mgEXPERIMENTALParticipants in Base Study/Part 1 who received vibegron 50 mg continued their treatment in the Extension Study. In addition, participants in Base Study/Part 1 who received vibegron 3 mg received vibegron 50 mg in the Extension Study. Also, participants in Base Study/Part 1 who received vibegron 50 mg + tolterodine ER for 4 weeks, followed by vibegron 50 mg alone for 4 weeks, remained on vibegron 50 mg in the Extension Study. In the extension, participants received one vibegron 50 mg tablet, one placebo matching vibegron tablet, and one placebo matching tolterodine ER capsule, taken orally each morning, for 52 weeks.
Extension Study: vibegron 100 mgEXPERIMENTALParticipants in Base Study/Part 1 or Part 2 who received vibegron 100 mg continued their treatment in the Extension Study. In addition, participants in Base Study/Part 1 who received vibegron 15 mg received vibegron 100 mg in the Extension Study. In the extension, participants received two vibegron 50 mg tablets and one placebo matching tolterodine ER capsule, taken orally each morning, for 52 weeks.
Extension Study: tolterodine ER 4 mgEXPERIMENTALParticipants in Base Study/Part 1 or Part 2 who received tolterodine ER 4 mg continued their treatment in the Extension Study. In addition, participants in Base Study/Part 1 who received placebo also received tolterodine ER 4 mg in the Extension Study. In the extension, participants received one tolterodine ER 4 mg capsule and two placebo matching vibegron tablets, taken orally each morning, for 52 weeks.
Extension Study: vibegron 100 mg + tolterodine ER 4 mgEXPERIMENTALParticipants in Base Study/Part 1 who received vibegron 100 mg + tolterodine ER 4 mg continued their treatment in the Extension Study. In addition, participants in Base Study/Part 2 who received placebo were assigned to the vibegron 100 mg + tolterodine ER 4 mg arm in the Extension Study. In the extension, participants received two vibegron 50 mg tablets and one tolterodine ER 4 mg capsule, taken orally each morning, for 52 weeks.
Interventions
NameTypeDescription
VibegronDRUGParticipants received vibegron oral tablets at dosages of 3 mg, 15 mg, 50 mg, or 100 mg depending on their vibegron arm assignment, taken orally each morning.
Tolterodine ERDRUGParticipants received one tolterodine ER 4 mg capsule, taken orally once a day.
Placebo matching vibegronDRUGParticipants received placebo matching vibegron tablets, taken orally each morning.
Placebo matching tolterodine ERDRUGParticipants received placebo matching tolterodine ER capsule, taken orally each morning.
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Eligibility Criteria
Age Range18 Years — 75 Years
SexALL
Healthy VolunteersNo

Inclusion Criteria: * If participant is of reproductive potential, must agree to remain abstinent or use (or have his/her partner use) 2 acceptable methods of birth control within the projected duration of the study * Clinical history of OAB for at least 3 months and meets either the OAB wet or OAB...

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