The United States reached a milestone, of sorts, when last week the Food and Drug Administration approved the first treatment for Covid-19.

The drug is called Veklury, although most people know it by its scientific name, remdesivir.

On Wednesday, its manufacturer, Gilead Sciences, said that remdesivir, which has been authorized for emergency use since the spring, had brought in $873 million in revenues so far this year and that it was the company’s second-best-selling drug in the third quarter, behind its H.I.V. drug, Biktarvy.