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Casirivimab+Imdevimab

Phase 2

Healthy | Small molecule | Other |Regeneron Pharmaceuticals, Inc.|Last Updated: Oct 20, 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLED
Total Trials2
Total Enrollment340

FDA Designations

No designations recorded

Clinical trial landscape

Casirivimab+Imdevimab · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT04852978COVID-19 Study to Assess Immunogenicity, Safety, and Tolerability of Moderna mRNA-1273 Vaccine Administered With Casirivimab+Imdevimab in Healthy Adult VolunteersHealthy
COMPLETED295 Analytics
PHASE2COMPLETED
COVID-19 Study to Assess Immunogenicity, Safety, and Tolerability of Moderna mRNA-1273 Vaccine Administered With Casirivimab+Imdevimab in Healthy Adult Volunteers
HealthyUnlock trial analytics

Study Endpoints

Primary Endpoints

50% Inhibitory Dilution (ID50) Titers of Vaccine-induced Neutralizing Antibodies to the SARS-CoV-2 S Protein in Individuals Who Received High Dose REGN10933+REGN10987 (1200 mg)
56 days after first dose of vaccine

High dose - (1200 mg arms)

50% Inhibitory Dilution (ID50) Titers of Vaccine-induced Neutralizing Antibodies to the SARS-CoV-2 S Protein in Individual Who Received Submaximal Dose Levels of REGN10933+REGN10987 (Less Than 1200 mg)
56 days after first dose of vaccine

Submaximal dose - (150 mg, 300 mg, 600 mg, 48 mg, and 12 mg)

Targeted grade ≥3 treatment-emergent adverse events (TEAEs)
Through end of study, approximately 16 weeks
Grade ≥3 injection-site reactions (ISRs)
Through end of study, approximately 16 weeks
Grade ≥2 infusion-related reactions (IRRs)
Through end of study, approximately 16 weeks
Grade ≥2 hypersensitivity reactions
Through end of study, approximately 16 weeks
Serious adverse events (SAEs)
Through end of study, approximately 16 weeks

Secondary Endpoints

Absolute Values in Concentrations of Vaccine-induced Antibodies to SARS-CoV-2 Antigens Over Time (S1-RBD IgA)
Up to 365 Days from 1st dose of Vaccination
Median Fold Change of Concentrations of Vaccine-induced Antibodies to SARS-CoV-2 Antigens Over Time (S1-RBD IgA)
Up to 365 Days from 1st dose of Vaccination
Relative Difference Expressed as a Percent in Vaccine-induced Antibodies to SARS-CoV-2 Antigens Over Time (S1-RBD IgA)
Up to 365 Days from 1st dose of Vaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Wave 1 Dose 1EXPERIMENTAL -
Wave 1 Dose 2EXPERIMENTAL -
Wave 1 Dose 3EXPERIMENTAL -
Wave 1 Vaccine onlyEXPERIMENTAL -
Wave 2 Dose 1EXPERIMENTAL -
Wave 2 Dose 2EXPERIMENTAL -
Wave 2 Vaccine onlyEXPERIMENTAL -
Wave 3 Dose 1EXPERIMENTAL -
Wave 3 Dose 2EXPERIMENTAL -
Wave 3 Vaccine onlyEXPERIMENTAL -
Wave 4 Dose 1EXPERIMENTAL -
Wave 4 Vaccine onlyEXPERIMENTAL -
Co-formulated casirivimab+imdevimab SCEXPERIMENTALRandomized 1:1
Co-formulated casirivimab+imdevimab IVEXPERIMENTALRandomized 1:1

Interventions

NameTypeDescription
casirivimab+imdevimabDRUGWave 1 Intravenous (IV) administration Wave 2 Subcutaneous administration
Moderna mRNA-1273 vaccineBIOLOGICALSingle intramuscular (IM) injection
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Eligibility Criteria

Age Range18 Years to 90 Years
SexALL
Healthy VolunteersYes
Study Sites6

Key Inclusion Criteria: 1. Healthy or has chronic medical condition(s) that are stable and well-controlled in the opinion of the investigator and that are not likely to require significant medical intervention through the end of study 2. Willing and able to comply with study visits and study-relate...

Countries:United States
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Frequently asked questions about Casirivimab+Imdevimab

What is Casirivimab+Imdevimab used for?

Casirivimab+Imdevimab is an investigational combination of two monoclonal antibodies being studied for use in healthy adults and those with chronic stable illness. It is being evaluated in clinical trials for its safety, tolerability, and immunogenicity, including when administered with a COVID-19 vaccine.

Who makes Casirivimab+Imdevimab?

Casirivimab+Imdevimab is developed by Regeneron Pharmaceuticals, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker REGN. Regeneron is conducting clinical trials to assess the combination's safety and tolerability in healthy adult volunteers.

What phase is Casirivimab+Imdevimab in?

Casirivimab+Imdevimab is in Phase 2 clinical development, with one completed Phase 2 trial and one completed Phase 1 trial. It remains investigational and has not been approved by regulatory authorities for any use.

What clinical trials is Casirivimab+Imdevimab in?

Casirivimab+Imdevimab has been studied in two completed trials: NCT04852978, a Phase 2 study of the Moderna mRNA-1273 vaccine administered with Casirivimab+Imdevimab in 295 healthy adults, and NCT05181683, a Phase 1 study of the co-formulated antibodies in 45 adult volunteers.

Is Casirivimab+Imdevimab the same as REGN-COV2?

Casirivimab+Imdevimab is a combination of two monoclonal antibodies developed by Regeneron. While it is sometimes referred to by the brand name REGN-COV2, the clinical trials listed here use the name Casirivimab+Imdevimab to describe the investigational product.