Luxembourg has banned the use of hydroxychloroquine to treat Covid-19 patients.

When asked by RTL, the Ministry of Heath explained that the malaria drug will also no longer be administered to patients participating in the Discovery study, a clinical trial to find a coronavirus treatment.

Recent studies showed that the drug is ineffective and that it can cause additional heart problems in patients. Remdesevir, a drug used to treat Ebola, shows greater promise and is also used in Luxembourg's hospitals to treat severe cases.

The French government similarly said Wednesday that doctors can no longer treat COVID-19 patients with hydroxychloroquine, a controversial and potentially harmful drug nonetheless being promoted by US President Donald Trump and Brazil's President Jair Bolsonaro. 
The move came after two French advisory bodies and the World Health Organization (WHO) warned this week that the drug, a treatment for rheumatoid arthritis and lupus, had been shown to be potentially dangerous in several studies.