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Pfizer says new COVID pill cuts hospitalization, death by 90%

Pfizer Inc announced on Friday that its experimental pill to treat COVID-19 can cut rates of hospitalization and death by nearly 90 per cent.  The…

Pfizer Inc announced on Friday that its experimental pill to treat COVID-19 can cut rates of hospitalization and death by nearly 90 per cent. 

The New York-based pharmaceutical company said it is no longer taking new patients in a clinical trial of the drug ‘due to the overwhelming efficacy’ and plans to submit data to US regulators soon.

“We were hoping that we had something extraordinary, but it’s rare that you see great drugs come through with almost 90 per cent efficacy and 100 per cent protection for death,’ Dr Mikael Dolsten, Pfizer’s chief scientific officer, said in an interview. 

This is the second pill to prove effective at treating the disease after Merck & Co announced last month that its experimental antiviral could reduce the risk of serious illness and death by half.

During a press briefing on Friday morning, President Joe Biden said the federal government has already secured ‘millions of doses’ of the drug, but did not provide a specific number. 

Pfizer’s candidate, which is called PF-07321332, belongs to a class of drugs known as protease inhibitors. 

The pill would work by inhibiting an enzyme that the coronavirus uses to make copies of itself inside human cells. 

Protease inhibitors have been effective at treating other viral pathogens such as HIV and hepatitis C virus, both on their own and in combination with other antivirals, the company said.

Pfizer believes this class of molecules may provide well-tolerated treatments against COVID-19, as currently marketed therapeutics that work on the same lines have not reported safety concerns.

On Friday, the drugmaker released preliminary results of its study of 775 adults who contracted mild-to-moderate COVID-19.

All were unvaccinated and were considered high risk for hospitalization due to health problems such as obesity, diabetes or heart disease.

Treatment began within three to five days of initial symptoms and lasted for five days. 

Patients taking the company’s drug along with another antiviral had an 89 per cent reduction in their combined rate of hospitalization or death after a month, compared to patients taking a dummy pill. 

Less than one per cent of patients taking the drug needed to be hospitalized and no one died. 

In the comparison group, seven per cent were hospitalized and there were seven deaths.

Pfizer reported few details on side effects but said rates of problems were similar between the groups at about 20 per cent. 

Currently, all COVID-19 treatments used in the US require an IV or injection. 

Competitor Merck’s COVID-19 pill is already under review at the US Food and Drug Administration (FDA) after showing strong initial results, and on Thursday the United Kingdom became the first country to greenlight it.

Pfizer said it will ask the FDA and international regulators to authorize its pill as soon as possible, after independent experts recommended halting the company’s study based on the strength of its results. 

Once Pfizer applies, the FDA could make a decision within weeks or months.

Researchers worldwide have been racing to find a pill against COVID-19 that can be taken at home to ease symptoms, speed recovery and reduce the crushing burden on hospitals and doctors.

An independent group of medical experts monitoring the trial recommended stopping it early, standard procedure when interim results show such a clear benefit.

 The data have not yet been published for outside review, the normal process for vetting new medical research.

Top US health officials continue to stress that vaccination will remain the best way to protect against infection.

But with tens of millions of adults still unvaccinated – and many more globally – effective, easy-to-use treatments will be critical to curbing future waves of infections.

The FDA has set a public meeting later this month to review Merck´s pill, known as molnupiravir. 

The company reported in September that its drug cut rates of hospitalization and death by 50 per cent. 

Experts warn against comparing preliminary results because of differences in studies.

Although Merck’s pill is further along in the US regulatory process, Pfizer’s drug could benefit from a safety profile that is more familiar to regulators with fewer red flags. 

While pregnant women were excluded from the Merck trial due to a potential risk of birth defects, Pfizer’s drug did not have any similar restrictions. 

The Merck drug works by interfering with the coronavirus’ genetic code, a novel approach to disrupting the virus.

Pfizer’s drug is part of a decades-old family of antiviral drugs known as protease inhibitors, which revolutionized the treatment of HIV and hepatitis C. The drugs block a key enzyme that viruses need to multiply in the human body.

The drug, which has not yet been named, was first identified during the SARS outbreak originating in Asia in 2003. 

Last year, company researchers decided to revive the medication and study it for COVID-19, given the similarities between the two coronaviruses.

The US has approved one other antiviral drug for COVID-19, remdesivir, and authorized three antibody therapies that help the immune system fight the virus. 

But they have to be given by IV or injection at hospitals or clinics, and limited supplies were strained by the last surge of the delta variant.

– MailOnline

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