The FDA approved remdesivir as a treatment for severe COVID-19 cases last month.
This is after granting emergency authorization in May, reports Business Insider.
But on Thursday, the WHO announced it will not recommend the drug's use for COVID-19 patients.
"There is currently no evidence that it improves survival or the need for ventilation," the organization said.
Remdesivir was the first coronavirus treatment to receive emergency authorization from the FDA.
