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EDP-938

Phase 2

RSV Infection | Small molecule | Infectious Disease |Enanta Pharmaceuticals, Inc.|Last Updated: Aug 19, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials6
Total Enrollment510

FDA Designations

No designations recorded

Clinical trial landscape

EDP-938 · 9 trials · 3 indications

Phase 2 3Phase 1 6
NCT05568706A Study of EDP-938 in Non-hospitalized Adults With RSV Who Are at High Risk for Complications.RSV Infection
COMPLETED187 Analytics
NCT04816721A Study to Evaluate EDP 938 Regimens in Children With RSVRespiratory Syncytial Virus (RSV)
COMPLETED99 Analytics
NCT04196101A Study to Assess EDP-938 for the Treatment of Acute Upper Respiratory Tract Infection With Respiratory Syncytial Virus in Adult SubjectsRespiratory Syncytial Virus
COMPLETED82 Analytics
PHASE2COMPLETED
A Study of EDP-938 in Non-hospitalized Adults With RSV Who Are at High Risk for Complications.
RSV InfectionUnlock trial analytics
PHASE2COMPLETED
A Study to Evaluate EDP 938 Regimens in Children With RSV
Respiratory Syncytial Virus (RSV)Unlock trial analytics
PHASE2COMPLETED
A Study to Assess EDP-938 for the Treatment of Acute Upper Respiratory Tract Infection With Respiratory Syncytial Virus in Adult Subjects
Respiratory Syncytial VirusUnlock trial analytics

Study Endpoints

Primary Endpoints

Time to Resolution of RSV Lower Respiratory Tract Disease (LRTD) Symptoms
Day 1 through Day 33

Resolution of LRTD Symptoms is defined as the first of two consecutive timepoints where each of the four LRTD symptoms (cough, short of breath, wheezing and coughing up phlegm\[sputum\]) as assessed by RiiQTM Scale Score is zero or 1. Time to resolution of LRTD symptoms is calculated as: date/time of resolution - date/time of first dose with conversion to days.

Time to Complete Resolution of LRTD Symptoms for the mITT Population
Day 1 through Day 33

Complete resolution of LRTD Symptoms is defined as the first of two consecutive timepoints where each of the four LRTD symptoms (cough, short of breath, wheezing and coughing up phlegm\[sputum\]) as assessed by Respiratory Infection Intensity and Impact Questionnaire (RiiQ) Scale Score is zero. Time to complete resolution of LRTD symptoms is calculated as: date/time of complete resolution - date/time of first dose with conversion to days.

Time to Complete Resolution of LRTD Symptoms for the HR3 Population
Day 1 through Day 33

Complete resolution of LRTD Symptoms is defined as the first of two consecutive timepoints where each of the four LRTD symptoms (cough, short of breath, wheezing and coughing up phlegm\[sputum\]) as assessed by RiiQTM Scale Score is zero. Time to complete resolution of LRTD symptoms is calculated as: date/time of complete resolution - date/time of first dose with conversion to days.

Part 1: Concentrations of EDP-938 in Plasma
3 hours post-dose on Day 1 and pre-dose on Day 2 (hospitalized participants only), Day 3, and Day 5

Plasma concentrations of EDP-938 were assessed at the designated time points.

Part 1: Number of Participants Who Experienced a Treatment-emergent Adverse Event (TEAE)
Day 1 to Day 28

TEAEs were defined as any event, side effect, or untoward medical occurrence in a participant enrolled in a clinical study whether or not it was considered to have a causal relationship to the study drug and first occurred or worsened during the post-baseline phase compared to baseline. Clinically significant changes from baseline in vital signs and clinical laboratory results were reported as TEAEs.

Part 2: Model-Adjusted Daily Change From Baseline in Respiratory Syncytial Virus (RSV) Shedding in Nasal Swab Samples
Baseline and pre-dose on Days 3, 5, 9, and 14

Daily change from baseline in RSV shedding was defined as the daily change from baseline in RSV ribonucleic acid (RNA) viral load and was measured using reverse transcription-quantitative polymerase chain reaction (RT-qPCR) from nasal swabs. The model included treatment group (EDP-938, placebo) and Day (3, 5, 9, and 14) as fixed effect, associated baseline, and treatment group by Day interaction term as factors. An unstructured covariance matrix was imposed. The Satterthwaite approximation is used to estimate the denominator degrees of freedom.

Pooled Population: Model-Adjusted Daily Change From Baseline in RSV Shedding in Nasal Swab Samples
Baseline and pre-dose on Days 3, 5, 9, and 14

Daily change from baseline in RSV shedding was defined as the daily change from baseline in RSV RNA viral load and was measured using RT-qPCR from nasal swabs. The model included treatment group (EDP-938, placebo) and Day (3, 5, 9, and 14) as fixed effect, associated baseline, and treatment group by Day interaction term as factors. An unstructured covariance matrix was imposed.The Satterthwaite approximation is used to estimate the denominator degrees of freedom.

Total Symptom Score (TSS) Area Under the Curve (AUC)
Day 1 through Day 14

Assessed by the RSV Symptom Diary, including 13 items assessing the severity of RSV-related signs and symptoms. The diary uses a 4-point scale that consists of grading symptoms on a scale of 0 to 3 for each item, where Grade 0 is Absent, Grade 1 is Noticeable, Grade 2 is Bothersome but not preventing activity, and Grade 3 is Bothersome and interfering with activities. TSS is derived daily by summing of the 13 observed symptom grade values from Day 1 through Day 14 to generate the curve for analysis.

Cmax of EDP-938 in plasma
Up to 11 days
AUC0-tlast of EDP-938 in plasma
Up to 11 days
AUC-inf in plasma
Up to 11 days
Amount excreted in urine (Aeu)
Up to 11 days
Amount excreted in feces (Aef)
Up to 11 days
Cmax of EDP-938 metabolites in plasma
Up to 11 days
Cmax of EDP-938 with and without coadministration with fluconazole
Up to 19 days
AUC of EDP-938 with and without coadministration with fluconazole
Up to 19 days
Cmax of tacrolimus with and without coadministration with EDP-938
up to 29 days
AUC of tacrolimus with and without coadministration with EDP-938
up to 29 days
Cmax of dabigatran with and without coadministration with EDP-938
up to 17 days
AUC of dabigatran with and without coadministration with EDP-938
up to 17 days
Cmax of rosuvastatin with and without coadministration with EDP-938
up to 17 days
AUC of rosuvastatin with and without coadministration with EDP-938
up to 17 days
Cmax of midazolam with and without coadministration with EDP-938
up to 17 days
AUC of midazolam with and without coadministration with EDP-938
up to 17 days
Cmax of EDP-938 with and without coadministration with itraconazole
Up to 19 days
AUC of EDP-938 with and without coadministration with itraconazole
Up to 19 days
Cmax of EDP-938 with and without coadministration with rifampin
Up to 17 days
AUC of EDP-938 with and without coadministration with rifampin
Up to 17 days
Cmax of EDP-938 with and without coadministration with quinidine
Up to 13 days
AUC of EDP-938 with and without coadministration with quinidine
Up to 13 days
Cmax of EDP-938 with and without coadministration with cyclosporine
Up to 12 days
AUC of EDP-938 with and without coadministration with cyclosporine
Up to 12 days
Cmax of EDP-938 with and without coadministration with prednisone
Up to 21 days
AUC of EDP-938 with and without coadministration with prednisone
Up to 21 days
Safety measured by adverse events, physical exams, vital signs, 12-lead electrocardiograms (ECGs) and clinical lab results (including chemistry, hematology, and urinalysis).
Up to 8 days

Secondary Endpoints

Time to Resolution of LRTD Symptoms and 2 Systemic Symptoms
Day 1 through Day 33
Time to Resolution of All RSV Symptoms
Day 1 through Day 33
Time to Complete Resolution of All RSV Symptoms for the mITT Population
Day 1 through Day 33
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
EDP-938EXPERIMENTALEDP-938 800 mg, once daily
PlaceboPLACEBO_COMPARATORMatching placebo, once daily
Single arm EDP-938EXPERIMENTAL -
EDP-938 and Fluconazole interactionEXPERIMENTAL -
EDP-938 and tacrolimus interaction (Part 1)EXPERIMENTAL -
EDP-938 and dabigatran interaction (Part 2)EXPERIMENTAL -
EDP-938 and rosuvastatin interaction (Part 3)EXPERIMENTAL -
EDP-938 and midazolam interaction (Part 4)EXPERIMENTAL -
EDP-938 and itraconazole interaction (Part 1)EXPERIMENTAL -
EDP-938 and rifampin interaction (Part 2)EXPERIMENTAL -
EDP-938 and quinidine interaction (Part 3)EXPERIMENTAL -
EDP-938 and cyclosporine interaction (Part 1)EXPERIMENTAL -
EDP-938 and prednisone interaction (Part 2)EXPERIMENTAL -
EDP-938 SAD CohortsEXPERIMENTALEDP-938 Dose 1, Dose 2, Dose 3, Dose 4, Dose 5, and Dose 6 oral suspension, once daily in one single administration
EDP-938 MAD CohortsEXPERIMENTALEDP-938 Dose 1, Dose 2, Dose 3, and Dose 4 oral suspension, once daily for 7 days
EDP-938 SAD Placebo CohortPLACEBO_COMPARATORMatching placebo, oral suspension, once daily in one single administration
EDP-938 MAD Placebo CohortPLACEBO_COMPARATORMatching placebo, oral suspension, once daily for 7 days

Interventions

NameTypeDescription
EDP-938DRUGSubjects took EDP-938 once daily for 5 days
PlaceboDRUGSubjects took matching placebo, once daily for 5 days
FluconazoleDRUGSubjects will receive fluconazole once daily on Days 5 to 18
TacrolimusDRUGSubjects will receive tacrolimus once daily on Day 1 and Day 24
DabigatranDRUGSubjects will receive dabigatran once daily on Day 1 and Day 13
RosuvastatinDRUGSubjects will receive rosuvastatin once daily on Day 1 and Day 13
MidazolamDRUGSubjects will receive midazolam once daily on Day 1 and Day 16
ItraconazoleDRUGSubjects will receive itraconazole once daily from Day 5 to Day 18
RifampinDRUGSubjects will receive rifampin once daily from Day 5 to Day 16
QuinidineDRUGSubjects will receive quinidine once daily from Day 5 to Day 12
CyclosporineDRUGSubjects will receive one dose of cyclosporine on Day 5
PrednisoneDRUGSubjects will receive prednisone once daily from Day 5 to Day 14
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites84

Inclusion Criteria: * At least one of the following conditions that predispose them to complications after RSV infection: 1. Age ≥65 years 2. Congestive heart failure (CHF) 3. Asthma 4. Chronic obstructive pulmonary disease (COPD) * The subject has a new onset of any of the following sympt...

Countries:United StatesArgentinaBulgariaColombiaCzechiaMalaysiaMexicoPolandSlovakiaSouth AfricaSpainTaiwanAustraliaBrazilGermanyIsraelNew ZealandRomaniaSouth KoreaUnited KingdomUkraine
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Frequently asked questions about EDP-938

What is EDP-938 used for?

EDP-938 is an investigational small molecule being developed for the treatment of respiratory syncytial virus (RSV) infection. It is currently in Phase 2 clinical development and has not been approved by the FDA.

Who makes EDP-938?

EDP-938 is being developed by Enanta Pharmaceuticals, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol ENTA.

What phase is EDP-938 in?

EDP-938 is in Phase 2 clinical development for the treatment of respiratory syncytial virus (RSV) infection. It is an investigational drug and has not received regulatory approval.

What clinical trials has EDP-938 been in?

EDP-938 has been studied in six clinical trials, all of which are completed. These include Phase 1 studies in healthy volunteers, such as NCT03384823, NCT03750383, NCT03755778, and NCT04498741, which evaluated drug-drug interactions and safety.

Is EDP-938 the same as any other drug?

No alternative names for EDP-938 have been disclosed. It is referred to solely as EDP-938 in clinical trial records and by its developer, Enanta Pharmaceuticals.