Potential new drugs have to go through years of laboratory work, animal testing and human clinical trials before they’re proved to be safe and effective against a specific disease. So developing a new antiviral against the novel coronavirus is not the best hope for containing the ongoing pandemic.
This is why researchers have been looking into existing drugs, some experimental and some already licensed, that were developed for other infections, such as Ebola and malaria. These drugs have a head start and we can establish more quickly whether they are useful against Covid-19.
Experimental drugs, such as remdesivir, may have already been tested in animals for safety. But they usually have to go through safety trials in humans, to assess what the safe dose is, before moving into clinical trials to assess how effective they are.
Existing antivirals have already been proved to be safe for humans, at a specific dose – so what needs to be done now is test whether they work in people with Covid-19. Although there are many small studies investigating the effectiveness of drugs like chloroquine, these can only give indications, not results that are conclusive enough to justify their approval. What we need are large randomised controlled trials, with hundreds or thousands of people enrolled across the world, to tell us whether existing antivirals bring benefits to people with Covid-19.
The research needed to see which Covid-19 treatments work