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What Is Regeneron’s Polyclonal Antibody Cocktail?

FDA Issues Emergency Authorization For Regeneron Antibody Cocktail to Treat COVID-19

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Update Nov. 23: On Nov. 21, the FDA announced that it had issued an emergency use authorization (EUA) for Regeneron Pharmaceuticals' antibody cocktail, casirivimab and imdevimab, for the treatment of COVID-19. This is the same antibody cocktail given to President Donald Trump when he was diagnosed with COVID-19 in October. The treatment is for people 12 years and older who have tested positive for COVID-19 and have a "high risk for progressing to severe COVID-19," according to an FDA press release, but not for people who have been hospitalized due to COVID-19. Casirivimab and imdevimab must be administered together by intravenous (IV) infusion.

In a clinical trial, the antibody cocktail was shown to reduce COVD-19 related hospitalization or emergency room visits in high-risk patients within 28 days after treatment. However, the FDA stated, "the safety and effectiveness of this investigational therapy for use in the treatment of COVID-19 continues to be evaluated."

Original post, Oct. 2: Early in the morning on Oct. 2, news broke that President Donald Trump and First Lady Melania Trump tested positive for COVID-19. Although the White House said the president was feeling "fatigued, but in good spirits," White House Press Secretary Kayleigh McEnany tweeted out a memo from Trump's physician that revealed he was injected with "a single 8 gram dose of Regeneron's polyclonal antibody cocktail." He was also being treated with zinc, vitamin D, melatonin, famotidine (Pepcid), and a daily aspirin. Although the antibody cocktail was administered as "a precautionary measure," it's still an experimental treatment.

What Is Regeneron's Polyclonal Antibody Cocktail?

The polyclonal antibody cocktail is an experimental drug cocktail from the biotech company Regeneron that is still in early clinical, randomized, double-blind trials. According to CNN, a cocktail antibody therapy uses two or more lab-engineered antibodies. CNN explained that this antibody cocktail from Regeneron includes a "monoclonal antibody that targets the spike protein the virus uses to drill into healthy cells, and another antibody that targets a different part of the novel coronavirus." The goal of the drug is to stop the virus from replicating.

On Sept. 29, Regeneron released early test results that involved only 245 patients indicating that the cocktail appeared to reduce levels of the virus, improve symptoms, and lower medical visits for patients, CNN reported. Jeanne Marrazzo, MD, director of the division of infectious diseases at University of Alabama at Birmingham, told CNN that the results of the trial seem "very promising," yet the data hasn't been peer reviewed.

The experimental drug is used as a medical substitute to the natural antibodies people develop when exposed to the SARS CoV-2 virus. Although the doctors who spoke to CNN called the experimental drug promising, it still needs to be tested in significantly more people to determine its effectiveness.

Before being taken in a helicopter to Walter Reed Medical Center on the evening of Oct. 2, Trump posted an 18-second video to his Twitter account where he said, "I think I'm doing very well, but we're going to make sure that things work out." He also noted that the first lady is "doing very well."

POPSUGAR aims to give you the most accurate and up-to-date information about the coronavirus, but details and recommendations about this pandemic may have changed since publication. For the latest information on COVID-19, please check out resources from the WHO, CDC, and local public health departments.

Image Source: Getty / scyther5
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