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Data updated: Mar 10, 2026

ANTHIM

OBILTOXAXIMAB Anthrax Protective Antigen-directed Antibody Interactions
Infectious Disease Approved 2016-03-18

ANTHIM (obiltoxaximab) is a monoclonal antibody indicated for the treatment of inhalational anthrax in adult and pediatric patients, administered in combination with appropriate antibacterial drugs. It is also indicated for prophylaxis when alternative therapies are unavailable or inappropriate, provided the benefits outweigh the risks of hypersensitivity and anaphylaxis. Because human efficacy trials involving intentional exposure are unethical, the drug's effectiveness is based on animal models, and it is not expected to cross the blood-brain barrier to treat meningitis.

Source: FDA Label • ELUSYS THERAPEUTICS INC • Anthrax Protective Antigen-directed Antibody

How ANTHIM Works

Obiltoxaximab is a monoclonal antibody that specifically binds to the protective antigen (PA) of Bacillus anthracis. By binding to this target, the drug neutralizes the biological activity of the anthrax toxin. It does not possess direct antibacterial activity and is intended for use alongside appropriate antibacterial medications to manage the infection.

Source: FDA Label
1
Indication
--
Phase 3 Trials
9
Years on Market

Details

Status
Prescription
First Approved
2016-03-18
Routes
INJECTION
Dosage Forms
INJECTABLE

Companies

Active Ingredient: OBILTOXAXIMAB

ANTHIM Approval History

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What ANTHIM Treats

1 indications

ANTHIM is approved for 1 conditions since its original approval in 2016. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Inhalational Anthrax
Source: FDA Label

ANTHIM Boxed Warning

HYPERSENSITIVITY and ANAPHYLAXIS Hypersensitivity and anaphylaxis have been reported during the intravenous infusion of ANTHIM. Due to the risk of hypersensitivity and anaphylaxis, ANTHIM should be administered in monitored settings by personnel trained and equipped to manage anaphylaxis. Monitor individuals who receive ANTHIM closely for signs and symptoms of hypersensitivity reactions throughout the infusion and for a period of time after administration. Stop ANTHIM infusion immediately and tr...

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

ANTHIM FDA Label Details

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Indications & Usage

FDA Label (PDF)

ANTHIM ® is a monoclonal antibody directed against the protective antigen of Bacillus anthracis . It is indicated in adult and pediatric patients for treatment of inhalational anthrax due to B. anthracis in combination with appropriate antibacterial drugs and, for prophylaxis of inhalational anthrax when alternative therapies are not available or are not appropriate. Limitations of Use ANTHIM should only be used for prophylaxis when its benefit for prevention of inhalational anthrax outweighs the risk of hypersensitivity and anaphylaxis. The effectiveness of ANTHIM is based solely on efficacy ...

⚠️ BOXED WARNING

WARNING: HYPERSENSITIVITY and ANAPHYLAXIS Hypersensitivity and anaphylaxis have been reported during the intravenous infusion of ANTHIM. Due to the risk of hypersensitivity and anaphylaxis, ANTHIM should be administered in monitored settings by personnel trained and equipped to manage anaphylaxis. M...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.