Tecovirimat - SIGA Technologies
Alternative Names: Arestvyr; SIGA-246; ST-246 Form I (monohydrate); ST-246 Form V (hemihydrate); ST-246®; Tecovirimat - SIGA Technologies; Tecovirimat monohydrate - SIGA Technologies; Tecovirimat-SIGA; TPOXXLatest Information Update: 22 May 2026
At a glance
- Originator ViroPharma
- Developer National Institute of Allergy and Infectious Diseases; SIGA Technologies
- Class Antivirals; Benzamides; Cyclopropanes; Fluorinated hydrocarbons; Isoindoles; Organic bridged compounds; Small molecules
- Mechanism of Action Orthopoxvirus p37 protein inhibitors
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Orphan Drug Status
Yes - Smallpox; Orthopoxvirus infections
Orphan designation is assigned by a regulatory body to encourage companies to develop drugs for rare diseases.
- New Molecular Entity Yes
Highest Development Phases
- Marketed Smallpox
- Registered Monkeypox; Orthopoxvirus infections; Vaccinia
Most Recent Events
- 31 Mar 2026 SIGA enters into an exclusive license agreement with Hikma to register and commercialise oral TPOXX in the Middle East and North Africa (MENA) region
- 26 Mar 2026 The CHMP recommends that Tecovirimat should no longer be used for the treatment of mpox
- 10 Mar 2026 SIGA Technologies expects CHMP recommendation for withdrawal of Tecovirimat for Monkeypox in March 2026