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Revealed: How a single pill home cure for Covid could be available this year

Trials of first pill specifically designed to stop SARS-CoV-2 are under way at Pfizer buildings in United States and Belgium

At two anonymous Pfizer buildings, one in the US and one in Belgium, a remarkable experiment is under way. Up to 60 volunteers, all clean-living adults aged between 18 and 60, are being given the first pill specifically designed to stop SARS-CoV-2.

If the trial is successful, it is just possible that a home cure for Covid-19 will become available later this year. The Prime Minister, who announced the formation of a UK Antivirals Taskforce last week specifically to invest in such products, will no doubt be scanning his text messages for early updates. The molecule being tested is a bespoke antiviral codenamed PF 07321332. Classed as a "protease inhibitor", it has been formulated to attack the "spine" of the SARS-Cov-2 virus and stop it replicating in our noses, throats and lungs. It was protease inhibitors that turned the tide on the spread of HIV in the UK and around the world. Now researchers hope they may be on the brink of a similar pandemic-busting breakthrough.

"If they have moved to this stage, they will be quietly optimistic," said Prof Penny Ward, visiting professor in pharmaceutical medicine at King's College London and a pioneer in the development of Tamiflu, an antiviral that combats seasonal and pandemic flu. "The question will be about how the drug is tolerated... They will be going like the clappers."

The anti-viral pill was developed from scratch during the current pandemic, Dafydd Owen, the director of medicinal chemistry at Pfizer, told a private symposium of the Division of Medicinal Chemistry last month. The first seven milligrams of the compound - no more than a raindrop - were made in late July. By late October, they had made 100 grams of the drug. Just two weeks later, they had more than a kilogram in the bag. It took 210 researchers to do it, said Owen.

Pfizer is keeping schtum about the detail of the lab tests it has completed but says it has demonstrated "potent in vitro antiviral activity against SARS-CoV-2" as well as activity against other coronaviruses, raising the prospect of cure to the common cold as well as future pandemic threats. "We have designed PF-07321332 as a potential oral therapy that could be prescribed at the first sign of infection, without requiring that patients are hospitalized or in critical care,"said Mikael Dolsten, chief scientific officer and president, worldwide research, development and medical of Pfizer in an official statement released last month.

According to Prof Ward, Pfizer's scientists will have most likely established the drug's "potent"" action against SARS-CoV-2 by deploying it against infected human tissue cultures, including lung tissue, in a laboratory. "Once you know it works in vitro, it's all about establishing its tolerance in animals and then humans," she said.

The Telegraph has obtained copies of the documents given to participants who are now entering the first human trials. "To date, the study drug has not been administered to humans", say the documents, which were formally approved on Feb 8. "The safety of the study drug has been studied in animals. In these animal studies, no significant risks or safety events of concern were identified, and the study drug did not cause side-effects at any of the dose levels that will be used in clinical studies."

Those who have signed up for the trial are in for an intensive few months. The trial is split into three phases and will run for 145 days, with another 28 days added for "screening and dosing". For all participants, there will be several overnight stays. "You are here today as a possible participant in a drug research study sponsored by Pfizer Incorporated," say the briefing documents. "Taking part in this study is voluntary (your choice)... If you are not completely honest about your health history, you may be harmed by being in this study."

The "randomized, double-blind, placebo-controlled, single- and multiple-dose escalation study" is designed to see how well or otherwise different dosing regimens are tolerated in humans while the active compound is maintained in the body. PF-07321332 will be administered in combination with low doses of Ritonavir, an antiviral used to treat HIV. It acts as a "booster" to increase the amount of PF-07321332 in participants' blood.

Phase 1 of the trial is designed to see how it "is tolerated as the dose is increased, alone or with ritonavir, if there are significant side effects, and how people feel after taking it", say the documents. Phase 2 will do the same but with "multiple doses", while in Phase 3, tablet and liquid forms of the drug will be tested, as will the impact of eating on top of it. Every detail has been specified in advance. In Phase 3, for example, a high-fat breakfast is defined as: "Two eggs fried in butter, two strips of pork bacon, two slices of toast with butter, 4 oz. of hash brown potatoes, and 8 oz. of whole milk.... eaten in 20 minutes".

Bringing a new drug to market is a long and difficult process, and even if PF-07321332 is found to be well tolerated in humans, formal Phase 3 trials would need to follow to establish whether the drug worked against people exposed to SARS-CoV-2. Prof Ward has also warned of more practical problems. The antiviral Tamiflu that she helped create costs about �25 a course and is still not widely prescribed in the UK against seasonal flu because of its price tag, despite some 20,000 people dying of the disease in Britain each year.

For Pfizer and PF-07321332, it is a "race against time", she said. They not only need to produce a drug that works but need to do it while SARS-CoV- 2 still presents a major public health threat.

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Covid pill that 'kills' virus within hours could be handed out on NHS and end lockdowns

A COVID pill may have the potential to end repeat lockdowns, according to scientists. If the pill is shown to work against the virus it will be handed out on the NHS and taken within a few days of a positive test.

An antiviral could be the answer to stopping coronavirus "in its tracks", Prime Minister Boris Johnson announced last week. It's not clear which drugs the Government will study. So far, the only antiviral undergoing UK clinical trials is the flu drug Favipiravir and results are expected in six months.

But Chief Trial Investigator Professor Kevin Blyth, of Glasgow University has said it would be a huge step forward if antiviral drugs work. He continued: "You don't have any hospital services being put under enormous pressure because patients never come to the hospital. "Normal services can function and you don't have to have lockdown or other draconian control measures."

Professor Blyth has further explained the medicines may be able to reduce spread and the risk of outbreaks happening. Also they would work by "killing" coronavirus in the body if taken quickly, within a few days of having a positive Covid test. Favipiravir was developed in Japan in 2014.

The GETAFIX trial it will be a part of will measure whether it stops Covid patients from becoming more seriously ill using a scoring system from one to 10. If it's shown to work against the Covid virus (SARS-CoV-2) then millions of doses will be handed out on the NHS. Volunteers in Glasgow are being urged to sign up as soon as they get a positive Covid test. A separate trial, also testing the same drug, will run in London.

Dr Janet Scott, previous Chief Investigator at GETAFIX, told The Sun: "The drugs which are the fastest into use, are drugs which are already in use for other diseases. "The only current candidate for an antiviral drug which is also oral is Favipriavir. "This drug was developed as an anti- influenza drug in Japan, but has had some early success in trials in China speeding up time to a person clearing the virus from the system and reducing lung damage."

NHS trials to repurpose existing drugs by proving they work against Covid have already taken place. Scientists in Britain discovered the steroid Dexamethasone tackled symptoms and cut the risk of severely ill hospitalised patients dying. The immunosuppressant Tocilizumab has also shown benefit. Remdesivir, an antiviral drug, had a mild benefit in severe Covid cases. Interferon beta, a protein which the body produces when it gets a viral infection, is at the centre of a large trial in the UK. Favipiravir has shown promising results in clinical studies in China, Russia, and Japan

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