Mylan (MYL) and Teva Pharmaceuticals (TEVA) plan to jumpstart production of hydroxychloroquine, which is also approved for treating lupus or rheumatoid arthritis. The medicine has been prescribed sparingly, mostly to travelers, and was in short supply this month, according to the American Society of Health-System Pharmacists, which counted a handful of manufacturers that were not shipping tablets.

The drug has taken on new life in recent weeks after several studies indicated it may show promise as a weapon to fight Covid-19, prompting some doctors to write prescriptions. As a result, Trump administration officials want to move quickly to determine whether the drug — and a closely related medicine called chloroquine — can be effective.

As a result, Mylan plans to restart production of hydroxychloroquine tablets at a West Virginia facility to meet “potential” increased demand and is looking to begin manufacturing outside the U.S. in coming weeks, according to a statement. In explaining its decision, the company noted the World Health Organization listed the drug as being under investigation for combating the coronavirus.