Recent Updates
Recently added Catalysts

ABI-5366

Phase 1

Recurrent Genital Herpes Simplex Type 2 | Small molecule | Infectious Disease |Assembly Biosciences, Inc.|Last Updated: Mar 30, 2026

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment115

FDA Designations

No designations recorded

Clinical trial landscape

ABI-5366 · 1 trial · 1 indication

Phase 1 1
NCT06385327A Study to Assess the Safety, Pharmacokinetics, and Antiviral Activity of ABI-5366 in Healthy Participants and Participants Seropositive for HSV-2 With Recurrent Genital HerpesRecurrent Genital Herpes Simplex Type 2
COMPLETED115 Analytics
PHASE1COMPLETED
A Study to Assess the Safety, Pharmacokinetics, and Antiviral Activity of ABI-5366 in Healthy Participants and Participants Seropositive for HSV-2 With Recurrent Genital Herpes
Recurrent Genital Herpes Simplex Type 2Unlock trial analytics

Study Endpoints

Primary Endpoints

Area Under the Plasma Concentration Time Curve (AUC) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Maximum Observed Plasma Concentration (Cmax) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Time to Cmax (Tmax) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Apparent Terminal Elimination Half Life (t 1/2) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Apparent Systemic Clearance (CL/F) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Apparent Volume of Distribution (Vz/F) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Dose normalized AUCs and Cmax of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Proportion of subjects with adverse events (AEs), premature treatment discontinuation due to AEs, and abnormal laboratory results
Up to 98 days after last dose

Secondary Endpoints

SAD Cohorts: Comparison of plasma AUC and Cmax between fasted and fed treatments
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing.
MAD Cohorts: If applicable, comparison of plasma PK profiles and parameters with and without loading doses
MAD Cohorts: At pre-specified time points from Days 8 to 36.
MAD Cohorts: Difference in viral shedding rate (number of anogenital swabs positive for HSV-2 DNA/total number of swabs) across treatments
MAD Cohorts: At pre-specified time points from Days 8 to 36.
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A: SAD Cohorts 1-5, ABI-5366EXPERIMENTALSingle dose of ABI-5366 (tablet) in Part A for Cohorts 1-5
Part A: SAD Cohorts 1-5, PlaceboPLACEBO_COMPARATORSingle dose of matching placebo (tablet) in Part A for Cohorts 1-5
Part A: SAD Fed Cohort 6, ABI-5366EXPERIMENTALSingle dose of ABI-5366 (tablet) in Part A for Cohort 6, food effect
Part B: MAD Cohorts 1-4 ABI-5366EXPERIMENTALWeekly or monthly dose of ABI-5366 (tablet) in Part B for Cohorts 1-4. May have a loading dose.
Part B: MAD Cohorts 1-4 PlaceboPLACEBO_COMPARATORWeekly or monthly dose of matching placebo (tablet) in Part B for Cohorts 1-4. May have a loading dose.

Interventions

NameTypeDescription
ABI-5366DRUGOnce daily tablet dosing (SAD) or weekly or monthly tablet dosing over the 29-day treatment period (MAD)
ABI-5366 PlaceboDRUGOnce daily tablet dosing (SAD) or weekly or monthly tablet dosing over the 29-day treatment period (MAD)
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to 60 Years
SexALL
Healthy VolunteersYes
Study Sites15

Part A: Inclusion Criteria: * Subject has a body mass index (BMI) between ≥ 18.0 and \< 32.0 kg/m2 * In good health (as determined by the Investigator) based on medical history, physical examination, ECG, and clinical laboratory results. * Female subjects must be non-pregnant and have a negative se...

Countries:AustraliaNew Zealand
Unlock Eligibility Criteria

Frequently asked questions about ABI-5366

What is ABI-5366 used for?

ABI-5366 is an investigational small molecule being developed for recurrent genital herpes simplex type 2 (HSV-2). It is currently in Phase 1 clinical development and is not yet approved by the FDA. The drug is being studied for its safety, pharmacokinetics, and antiviral activity in healthy participants and those seropositive for HSV-2.

Who makes ABI-5366?

ABI-5366 is being developed by Assembly Biosciences, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ASMB. The company is conducting clinical trials to evaluate the drug's safety and antiviral activity in patients with recurrent genital herpes simplex type 2.

What phase is ABI-5366 in?

ABI-5366 is in Phase 1 clinical development. A Phase 1 study has been completed, evaluating the drug in healthy participants and participants seropositive for HSV-2 with recurrent genital herpes. The drug remains investigational and has not received FDA approval.

What clinical trials is ABI-5366 in?

ABI-5366 has one completed Phase 1 clinical trial, identified as NCT06385327. This randomized, double-blind, placebo-controlled study enrolled 115 participants in Australia and New Zealand to assess the safety, pharmacokinetics, and antiviral activity of ABI-5366 in healthy participants and those with recurrent genital herpes simplex type 2.

How does ABI-5366 work?

ABI-5366 is a small molecule antiviral agent. Its specific molecular target has not been disclosed in available information. The drug is being studied for its ability to reduce viral activity in patients with recurrent genital herpes simplex type 2, based on its antiviral properties observed in clinical trials.