WHO stops study on hydroxychloroquine drug for Covid-19

Tuesday May 26 2020

WHO Director-General Tedros Adhanom Ghebreyesus who on May 25, 2020 said that in light of a paper published last week in the Lancet, there would be “a temporary pause” on the hydroxychloroquine arm of its global clinical trial. PHOTO | CHRISTOPHER BLACK | WHO | AFP


The World Health Organisation (WHO) has temporarily suspended trials of hydroxychloroquine from its global study into experimental Covid-19 treatments, saying that its experts need to review all available evidence to date.

The UN health agency in March launched a multinational trial on a variety of repurposed drugs to kick-start the search for a treatment for Covid-19.

But on Monday, WHO said the suspension was informed by safety concerns for Covid-19 patients. Naturally, hydroxychloroquine is a medication used to prevent and treat malaria in areas where the mosquito-borne disease remains sensitive to chloroquine.


Speaking on Monday, WHO Director-General Tedros Adhanom Ghebreyesus said that in light of a paper published last week in the Lancet that showed people taking hydroxychloroquine were at a higher risk of death and heart problems, there would be “a temporary pause” on the hydroxychloroquine arm of its global clinical trial.

“The executive group has implemented a temporary pause of the hydroxychloroquine arm within the Solidarity trial while the safety data is reviewed by the data safety monitoring board,” Tedros said during the Monday online briefing.


He said the concern related only to the use of hydroxychloroquine and chloroquine for Covid-19, adding that the drugs are accepted treatments for people with malaria and auto-immune diseases.


The drug, also referred to as HCQ, is an approved treatment for malaria and autoimmune diseases like rheumatoid arthritis, lupus, and a type of blood disorder that affects the skin known as Porphyria cutanea tarda (PCT).

“The other arms of the trial are continuing,” added Dr Tedros.

The global trial termed Solidarity trial is being carried out in several countries across the world with Kenyan researchers joining their international counterparts in the search for a cure for Covid-19. There are plans for clinical trials for three drugs.

Other treatments in the WHO’s Solidarity trial, including the experimental drug remdesivir and a combination therapy of two HIV drugs – lopinavir and ritonavir – are still being pursued.


The drugs are being studied because they have all shown some evidence of effectiveness against the SARS-CoV 2 virus, which causes Covid-19, either in cells (in vitro) and or animal studies.

Hydroxychloroquine has been touted by US President Donald Trump and others as a possible treatment for the disease caused by the coronavirus.

The US National Institutes of Health is also running a clinical trial to establish whether the drug, administered with the antibiotic azithromycin, can prevent hospital admissions and death from Covid-19.

The WHO previously recommended against using hydroxychloroquine to treat or prevent coronavirus infections, except as part of clinical trials.

Dr Mike Ryan, the head of the WHO emergencies programme, said the decision to suspend trials of hydroxychloroquine had been taken out of “an abundance of caution”.