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CDI-988

Phase 1

Norovirus | Small molecule | Infectious Disease |Cocrystal Pharma, Inc.|Last Updated: Feb 17, 2026

Target and mechanism

Molecular targetprotease
Target classEnzyme
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment40

FDA Designations

FAST_TRACK

Clinical trial landscape

CDI-988 · 2 trials · 2 indications

Phase 1 2
NCT07198139A Study to Evaluate the Efficacy, Safety and Pharmacokinetics of CDI-988 in Healthy Adults After Challenge With Snow Mountain VirusNorovirus
RECRUITING40 Analytics
NCT05977140CDI-988 Safety Study in Healthy ParticipantsHealthy Volunteers
COMPLETED116 Analytics
PHASE1RECRUITING
A Study to Evaluate the Efficacy, Safety and Pharmacokinetics of CDI-988 in Healthy Adults After Challenge With Snow Mountain Virus
NorovirusUnlock trial analytics
PHASE1COMPLETED
CDI-988 Safety Study in Healthy Participants
Healthy VolunteersUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of norovirus-confirmed disease
Day 0 to Day 21

Disease is defined as diarrhea and/or vomiting (during the inpatient period), with laboratory-confirmed infection (with SMV specific primers on stool/emesis) or seroconversion

Adverse events
Day 1 to 7 days after last dose

number of participants with treatment-emergent adverse events

Laboratory abnormalities
Day 1 to 7 days after last dose

number of participants with clinically significant laboratory abnormalities

Vital signs
Day 1 to 7 days after last dose

number of participants with clinically significant changes from baseline in vital signs

ECGs
Day 1 to 7 days after last dose

number of participants with clinically significant changes from baseline in ECGs

Secondary Endpoints

Modified Vesikari Score (MVS) symptom scores during the inpatient period in infected patients
Day 1 to Day 6
Time to symptom improvement
Day 1 to Day 6
Time to first SMV-negative stool
Day 1 to Day 6
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Snow Mountain VirusOTHERChallenge with Snow Mountain Virus
Stage 2: Drug CDI-988EXPERIMENTAL -
Stage 2: PlaceboPLACEBO_COMPARATOR -
SAD Cohort 1AEXPERIMENTALfirst single-dose level
SAD Cohort 1BEXPERIMENTALsecond single-dose level
SAD Cohort 1CEXPERIMENTALthird single-dose level; food-effect cohort
SAD Cohort 1DEXPERIMENTALfourth single-dose level
MAD Cohort 2AEXPERIMENTALfirst multiple-dose level
MAD Cohort 2BEXPERIMENTALsecond multiple-dose level
MAD Cohort 2CEXPERIMENTALthird multiple-dose level
SAD Cohort 1EEXPERIMENTALfifth dose level; food effect cohort
SAD Cohort 1FEXPERIMENTALsixth dose level
MAD Cohort 2DEXPERIMENTAL4th multiple dose level
MAD Cohort 2EEXPERIMENTAL5th multiple dose level
MAD Cohort 2FEXPERIMENTAL6th multiple dose level

Interventions

NameTypeDescription
CDI-988DRUGAntiviral to treat norovirus
PlaceboDRUGMatching placebo
Snow Mountain VirusOTHERChallenge with Snow Mountain Virus
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Eligibility Criteria

Age Range18 Years to 49 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Healthy male or non-pregnant female * Aged 18 to 49 years * Good state of health * Known fucosyl transferase 2 (FUT2) secretor status Exclusion Criteria: * History of participation in any norovirus challenge or vaccine clinical trial * Receipt or planned receipt of any non-l...

Countries:United StatesAustralia
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Recent Changes (Last 90 Days)

LOWMay 26, 2026NCT07198139primaryCompletionDate: changed
LOWMay 24, 2026NCT07198139studyFirstPostDate: changed

Frequently asked questions about CDI-988

What is CDI-988 used for?

CDI-988 is an investigational small molecule being developed by Cocrystal Pharma, Inc. for the prevention or treatment of norovirus infection. It is currently being studied in healthy volunteers and in a norovirus challenge study. The drug is in Phase 1 clinical development and has not been approved by the FDA.

What does CDI-988 target?

CDI-988 targets the protease enzyme of norovirus. As a small molecule protease inhibitor, it is designed to interfere with viral replication. This mechanism is being evaluated in early-stage clinical trials to assess its safety and potential efficacy against norovirus.

Who makes CDI-988?

CDI-988 is being developed by Cocrystal Pharma, Inc., a biopharmaceutical company listed on the NASDAQ under the ticker symbol COCP. The company is conducting clinical trials to evaluate the safety and efficacy of this investigational drug for norovirus.

What phase is CDI-988 in?

CDI-988 is in Phase 1 clinical development. It has completed one Phase 1 safety study in healthy participants and is currently recruiting for another Phase 1 study involving a norovirus challenge. The drug is investigational and has not received FDA approval.

What clinical trials is CDI-988 in?

CDI-988 has been studied in two Phase 1 trials. NCT05977140 was a completed safety study in 116 healthy participants in Australia. NCT07198139 is an ongoing recruiting study in the United States evaluating efficacy, safety, and pharmacokinetics in healthy adults after challenge with Snow Mountain virus.

Is CDI-988 FDA approved?

No, CDI-988 is not FDA approved. It is an investigational drug currently in Phase 1 clinical trials. The FDA has granted it Fast Track designation, which is intended to expedite development and review, but the drug remains in clinical development and has not been approved for any use.