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BIIB800

Phase 1

Undisclosed | Small molecule | Other |Biogen Inc.|Trials Updated: Oct 6, 2025

BIIB800 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Feb 2024

BIIB800 target and mechanism

Molecular targetIL-6R
Target classReceptor
ModalitySmall molecule

Also known as BAT1806

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials1
Total Enrollment300

FDA Designations

No designations recorded

BIIB800 clinical trials

BIIB800 · 1 trial · 1 indication

Phase 1 1
NCT06262477A Study to Evaluate the Pharmacokinetics, Safety and Immunogenicity of BIIB800 Subcutaneously (SC) Compared to Actemra® in Healthy Male ParticipantsHealthy Volunteer
COMPLETED300 Analytics
PHASE1COMPLETED
A Study to Evaluate the Pharmacokinetics, Safety and Immunogenicity of BIIB800 Subcutaneously (SC) Compared to Actemra® in Healthy Male Participants
Healthy VolunteerUnlock trial analytics

Study Endpoints

Primary Endpoints

Maximum Observed Serum Concentration (Cmax) of Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Area Under the Concentration-Time Curve From Time Zero to Infinity (AUC0-inf) of Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Area Under the Concentration-Time Curve up to the Last Measurable Concentration (AUC0-t) of Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)

Secondary Endpoints

Time to Reach Cmax (Tmax) of BIIB800 and Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Apparent Total Body Clearance (CL/F) of BIIB800 and Actemra
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Apparent Terminal Half-Life (t1/2) of BIIB800 and Actemra
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
BIIB800EXPERIMENTALParticipants will receive a single dose of BIIB800 via autoinjector, administered SC in the outer area of the upper arm on Day 1 of the study.
ActemraEXPERIMENTALParticipants will receive a single dose of Actemra via autoinjector, administered SC in the outer area of the upper arm on Day 1 of the study.

Interventions

NameTypeDescription
BIIB800DRUGAdministered as specified in the treatment arm.
ActemraDRUGAdministered as specified in the treatment arm.
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Eligibility Criteria

Age Range18 Years to 55 Years
SexMALE
Healthy VolunteersYes
Study Sites4

Key Inclusion Criteria: * Have a body mass index between 18.5 and 29.9 kilograms per meter square (kg/m\^2), inclusive. * Total body weight between 60.0 and 90.0 kg, inclusive. * Systolic blood pressure \<135 millimeters of mercury (mmHg) or \>85 mmHg at Screening, after being supine for at least 5...

Countries:United StatesUnited Kingdom
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Frequently asked questions about BIIB800

What is BIIB800?

BIIB800 is an investigational small molecule developed by Biogen Inc. It is designed to target the IL-6 receptor (IL-6R). Biogen has studied it in a Phase 1 clinical trial in healthy male volunteers, comparing its pharmacokinetics, safety, and immunogenicity to Actemra when given subcutaneously.

What does BIIB800 target?

BIIB800 targets the IL-6 receptor, also known as IL-6R, which is a receptor target. By binding to IL-6R, the small molecule is intended to interfere with interleukin-6 signaling. This mechanism is being explored in an investigational Phase 1 program rather than in an approved product.

Who makes BIIB800?

Biogen Inc., which trades on Nasdaq under the ticker BIIB, is the developer of BIIB800. The company sponsored the Phase 1 study of the compound. Biogen is a biotechnology company focused on neuroscience and immunology programs, and BIIB800 is part of its investigational pipeline.

What phase is BIIB800 in?

BIIB800 is in Phase 1 clinical development. It is investigational and has not been approved by the FDA. Biogen has completed one Phase 1 trial of the compound, and no active trials are currently listed for it. The completed study enrolled 300 participants.

What clinical trials is BIIB800 in?

BIIB800 has been studied in one Phase 1 trial, NCT06262477, titled a study to evaluate the pharmacokinetics, safety, and immunogenicity of BIIB800 subcutaneously compared to Actemra in healthy male participants. The trial was completed, enrolled 300 participants, was randomized and double blind, and took place in the United States and United Kingdom.