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BIIB800

Phase 1

Healthy Volunteer | Small molecule | Other |Biogen Inc.|Last Updated: Oct 6, 2025

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

Clinical trial landscape

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
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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 used for?

BIIB800 is an investigational small molecule being studied in healthy volunteers. It is currently in Phase 1 clinical development, with a completed trial evaluating its pharmacokinetics, safety, and immunogenicity when given subcutaneously compared to Actemra in healthy male participants.

Who makes BIIB800?

BIIB800 is being developed by Biogen Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol BIIB. The company is conducting clinical research on this investigational small molecule in healthy volunteer populations.

What phase is BIIB800 in?

BIIB800 is in Phase 1 clinical development. One Phase 1 trial has been completed, which enrolled 300 healthy male participants. The drug is investigational and has not been approved by regulatory authorities.

What clinical trials is BIIB800 in?

BIIB800 has one completed clinical trial registered as NCT06262477. This Phase 1 study evaluated the pharmacokinetics, safety, and immunogenicity of BIIB800 administered subcutaneously compared to Actemra in healthy male participants. The trial was conducted in the United States and United Kingdom.

Is BIIB800 the same as Actemra?

BIIB800 is not the same as Actemra. In clinical trials, BIIB800 is being compared to Actemra as an active control. The study evaluates how BIIB800 performs relative to Actemra in terms of pharmacokinetics, safety, and immunogenicity when both are given subcutaneously.