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Tecovirimat

Phase 3

Smallpox | Small molecule | Infectious Disease |SIGA Technologies Inc.|Last Updated: Sep 11, 2026

Target and mechanism

Molecular targetVP37
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment549

FDA Designations

No designations recorded

Clinical trial landscape

Tecovirimat · 2 trials · 1 indication

Phase 3 1Phase 2 1
NCT02474589A Trial to Assess the Safety, Tolerability, and Pharmacokinetics of the Anti-Orthopoxvirus Compound TecovirimatSmallpox
COMPLETED449 Analytics
PHASE3COMPLETED
A Trial to Assess the Safety, Tolerability, and Pharmacokinetics of the Anti-Orthopoxvirus Compound Tecovirimat
SmallpoxUnlock trial analytics

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 to 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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Frequently asked questions about Tecovirimat

What is Tecovirimat used for?

Tecovirimat is an investigational small molecule drug being developed for smallpox, a viral infectious disease. It is currently in Phase 3 clinical development and is not yet approved by the FDA. Tecovirimat is being studied for its safety, tolerability, and pharmacokinetics in healthy volunteers.

What does Tecovirimat target?

Tecovirimat targets the VP37 protein, which is essential for the formation of the outer envelope of orthopoxviruses, including the smallpox virus. By inhibiting VP37, Tecovirimat is designed to prevent the virus from spreading within the host.

Who makes Tecovirimat?

Tecovirimat is being developed by SIGA Technologies Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol SIGA. The company is conducting clinical trials to evaluate the drug's safety and efficacy for the treatment of smallpox.

What phase is Tecovirimat in?

Tecovirimat is in Phase 3 clinical development. It has completed one Phase 3 trial and has one active Phase 2 trial that is not recruiting participants. Tecovirimat is an investigational drug and has not received FDA approval.

What clinical trials is Tecovirimat in?

Tecovirimat is being studied in two clinical trials. NCT02474589 is a completed Phase 3 trial assessing safety, tolerability, and pharmacokinetics in 449 healthy volunteers. NCT04957485 is an active Phase 2 trial evaluating safety and immunogenicity when administered orally for 28 days with JYNNEOS in 100 healthy volunteers.