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Tecovirimat

Phase 3

Smallpox | Small molecule | Other |SIGA Technologies Inc.|Last Updated: Apr 2, 2026

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_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment549
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT02474589A Trial to Assess the Safety, Tolerability, and Pharmacokinetics of the Anti-Orthopoxvirus Compound TecovirimatPHASE3 COMPLETED 449Jun 19, 2015Aug 24, 2016Nov 28, 201711 United States
NCT04957485Study to Assess the Safety and Immunogenicity of TPOXX® When Administered Orally for 28 Days With JYNNEOSPHASE2 ACTIVE NOT_RECRUITING 100Apr 5, 2022Jan 1, 2027Apr 2, 20262 United States
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Study Endpoints
Primary Endpoints
To Determine the Number of Participants With Adverse Events
45 days

To determine the safety and tolerability of oral tecovirimat

Adverse Events
59 Days

Number of participants with adverse events when TPOXX or TPOXX Placebo is coadministered with JYNNEOS

Immunogenicity
Day 43

Least squared geometric mean

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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
ActiveACTIVE_COMPARATOR600 mg tecovirimat capsules BID to assess safety and tolerability and pharmacokinetics of the anit-orthopoxvirus compound Tecovirimat when administered orally in healthy subjects
PlaceboPLACEBO_COMPARATORmatching placebo capsules BID to assess safety and tolerability and pharmacokinetics of the anit-orthopoxvirus compound Tecovirimat when administered orally in healthy subjects
JYNNEOS + TPOXXACTIVE_COMPARATORAn oral dose of 600 mg (3 × 200 mg capsules) TPOXX BID (every 12 hours \[±30 minutes\]) for 28 days and a single AM SC dose of 0.5 mL JYNNEOS on Day 1 and Day 29. JYNNEOS will be administered with TPOXX concomitantly on Day 1
JYNNEOS + matching TPOXX placeboPLACEBO_COMPARATORAn oral dose of placebo (3 capsules identical to TPOXX) BID (every 12 hours \[±30 minutes\]) for 28 days and a single AM SC dose of 0.5 mL JYNNEOS on Day 1 and Day 29. JYNNEOS will be administered with TPOXX placebo concomitantly on Day 1.
Interventions
NameTypeDescription
tecovirimatDRUGStudy is based on Animal Regulatory Rule
PlaceboOTHERDoes not apply
Smallpox and Mpox VaccineDRUGvaccine
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Eligibility Criteria
Age Range18 Years — 80 Years
SexALL
Healthy VolunteersYes
Study Sites11

Inclusion Criteria: * 18 to 80 years old, inclusive * Available for clinical follow-up for the duration of the study * Able and willing to give informed consent * In good general health without clinically significant medical history; not have been hospitalized for a chronic medical condition for th...

Countries:United States
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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT04957485primaryCompletionDate: changed
LOWMay 24, 2026NCT04957485studyFirstPostDate: changed