A bottle of Prasco Laboratories Hydroxychloroquine Sulphate is arranged for a photograph in Queens, New York, April 7, 2020.

The U.S. Food and Drug Administration said Tuesday that taking hydroxychloroquine is "ultimately" a choice between patients and their health-care providers, appearing to soften its earlier advisory against taking the anti-malaria drug outside of a hospital.

"The decision to take any drug is ultimately a decision between a patient and their doctor," FDA Commissioner Dr. Stephen Hahn said in a statement to CNBC. "Hydroxychloroquine and chloroquine are already FDA-approved for treating malaria, lupus, and rheumatoid arthritis."