Christian Perronne, head of infectious diseases, University Hospital Raymond Poincaré, Garches, Paris, was more enthusiastic.
"I really believe in hydroxychloroquine. It is a drug I find rather fascinating, that has been used for decades.
There have been positive results in an in vitro study and a preliminary Chinese study in 100 patients which showed that hydroxychloroquine reduced the viral load, the symptoms lasted for less time, and they are not as severe. This could reduce the number of carriers, which I find interesting from an epidemiological perspective.
"I think from an ethical point of view, we should suggest it to all patients with severe disease who are hospitalised, under surveillance and on short treatment, paying attention to drug interactions, especially with drugs that prolong the QT interval. Afterwards, in terms of adverse effects, at increased doses, it is possible that patients will have pain or fever, but it seems that the treatment is effective at lower doses, according to the Chinese data. In any case, the adverse effects of this compound are not dangerous."
On the adverse effects, Professor Thomas Papo, from Bichat Hospital, the University of Paris, confirmed via email: "Hydroxychloroquine (
Plaquenil, which is not chloroquine), vaunted by Didier Raoult as an anti-viral, has been used for decades in tens of thousands of patients, for several decades, so we have a huge follow-up and lots of data. This drug is remarkably well tolerated and we give it to all patients with lupus (for example), including in pregnant women. The main complication (retinal toxicity) is rare and does not last beyond 5 years of continuous use."