Three large, in-progress randomized controlled trials (RCTs) with strong study designs ceased enrollment for the hydroxychloroquine-only versus control comparison early due to lack of efficacy in preliminary analyses.

Key Points

• Do not use chloroquine or hydroxychloroquine alone or in combination with azithromycin as prophylaxis against COVID-19.
• Do not use chloroquine or hydroxychloroquine alone or in combination with azithromycin as a treatment of patients with COVID-19.
• Clinicians may choose to treat hospitalized COVID-19–positive patients with chloroquine or hydroxychloroquine alone or in combination with azithromycin in the context of a clinical trial, using shared and informed decision making with patients (and their families).