It is hoped "a specific form" of the anti-inflammatory drug can prevent severe breathing problems and mean less time in hospital.
The warning comes as the government prepares to ease coronavirus lockdown measures in England, saying it is safe to relax them.
It comes after Twitter flagged one of the US president's tweets about mail-in ballots with a fact-check warning.
The White House gave no further details about the order, which is due to take place on Thursday.
Dr Anthony Fauci has said scientific advice shows hydroxychloroquine has a lack of desired effect on coronavirus.
Boris Johnson and his top aide Dominic Cummings have both suggested that coronavirus may have impacted their eyesight.
The antiviral drug remdesivir was originally developed to treat Ebola.
The drones will be flown 12 miles across the sea from Oban to Mull which was closed before the Scottish lockdown.
The launch was going well until after the rocket was dropped from the plane and the mission had to be aborted.
I see far more research articles than I could possibly write up. This column collects the most interesting of those papers and advances, along with notes on why they may prove important in the world o
Professior Adrian Hill describes the efforts to create a vaccine as a "race against the virus disappearing, and against time".
In the days and weeks after Tesla CEO Elon Musk revealed the cybertruck — a post-apocalyptic inspired vehicle made of cold-rolled steel — there was a lot of speculation about whether it would be smal
The first phase involved 160 volunteers - aged between 18 and 55 - but now researchers want to expand that to include children.
Clinical trials will now take place on a drug that could prevent the decline of those most likely to be worst-hit by COVID-19.
K9 patrols the ground floor of a mall with hand sanitiser strapped to his back, ready to dispense it to any passing shopper.
A browser-based game, which allows users to change social distancing measures, offers an educational tool about the virus.
Researchers are calling for clinical trials to see if the use of anti-blood clot drugs could help save lives of COVID-19 patients.
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