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NIH scientists say they could have discovered a promising new oral antiviral drug

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Scientists may have found promising new treatment for Covid-19 after an experimental oral antiviral drug demonstrated the ability to prevent the coronavirus from replicating, the National Institutes of Health said Thursday, citing a new study.

The drug called TEMPOL can reduce Covid-19 infections by interfering with an enzyme that the virus needs to make copies of itself once it’s in human cells, which could potentially limit the severity of the disease, des researchers said NIH. The drug was tested in a live virus cell culture experiment.

“We urgently need additional effective, accessible treatments for COVID-19,” wrote Dr. Diana W. Bianchi, director of the National Institute of Child Health and Human Development at the NIH, in a statement. “An oral drug that prevents SARS-CoV-2 from replicating would be an important tool in reducing the severity of the disease.”

The results were published in the journal Science.

While vaccines have been incredibly useful in containing Covid-19 cases in the United States and other parts of the world, scientists say treatments are still badly needed for those who contract the virus.

According to the Johns Hopkins University, the US reported an average of around 16,300 infections per day on Wednesday. Gilead Sciences’ remdesivir is the only drug that has received full US approval from the Food and Drug Administration for the treatment of Covid and that must be administered intravenously in a hospital.

Pfizer, who worked with German drug maker BioNTech to develop the first approved Covid-19 vaccine in the United States, is also developing an oral drug against Covid that can be taken at home at the first signs of illness. The researchers hope the drug will prevent the disease from getting worse and prevent hospital stays. It started with an early trial in March.

The NIH researchers said they intend to conduct additional preliminary studies and look for ways to evaluate the drug in a clinical study on Covid.

The results of the study are “hopeful,” said Dr. Tracey Rouault, another NIH officer who led the study.

“However, clinical trials are needed to determine whether the drug will be effective in patients, especially early on in the disease process when the virus begins to replicate.”

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Pfizer begins early stage scientific trial testing oral antiviral drug

Pfizer said Tuesday it had started an early clinical trial of an experimental oral antiviral drug for Covid-19.

The New York-based company announced that the Phase 1 study of the drug PF-07321332 will be conducted in the United States. The drug belongs to a class of drugs called protease inhibitors, and it works by blocking an enzyme that the virus needs to replicate in human cells.

Protease inhibitors are used to treat other viral pathogens such as HIV and hepatitis C.

“Fighting the COVID-19 pandemic requires both preventive vaccination and targeted treatment of those who become infected with the virus,” Pfizer’s chief scientist Mikael Dolsten said in a press release. “Given the way SARS-CoV-2 is mutating and the ongoing global impact of COVID-19, it is likely that access to therapeutic options will be critical both now and after the pandemic.”

The study comes as Pfizer is also working on an intravenously administered protease inhibitor known as PF-07304814. This drug is currently in a Phase 1b clinical trial in patients hospitalized with Covid-19.

A person walks past the Pfizer building in New York City on March 2, 2021.

Carlo Allegri | Reuters

Pfizer already has an approved vaccine in the US with German drug maker BioNTech, but health experts say the world will need a slew of drugs and vaccines to end the pandemic that is infecting more than 29.8 million Americans and is coming soon Has killed at least 542,991 people over a year, according to the Johns Hopkins University.

Preclinical studies have shown that the oral drug, the first orally ingested protease inhibitor for Covid-19 to be studied in clinical trials, has “strong” antiviral activity against the virus.

Because the drug is taken orally, it can be used outside of hospitals for people newly infected with the virus. The researchers hope the drugs will prevent the disease from getting worse and keep people out of the hospital.

Pfizer said it will provide more details on the drug at the Spring American Chemical Society meeting on April 6.