The World Health Organization (WHO) is discontinuing a study into the treatment of corona patients with hydroxychloroquine.
A WHO expert says that other research has also shown that the administration of the malaria drug has no beneficial effects.
Hydroxychloroquine has not been specifically developed to fight coronavirus but has been used for this in some countries.
US President Donald Trump had high expectations of the drug, which he himself would have taken preventively.
Experts have long questioned the use of hydroxychloroquine against the coronavirus. For example, Dutch experts recently decided to discontinue an investigation.
The leader of that halted Dutch study then expressed the expectation that other medicines will work better against the virus.