Investigated for treating COVID-19.
Contra-indicated in patients with recent (within the last 6 months) occurrence of: myocardial infarction, unstable angina, stroke, transient ischemic attack, decompensated heart failure requiring hospitalization, or Class III/IV heart failure; history or presence of Mobitz Type II 2nd degree or 3rd degree AV block or sick sinus syndrome, unless patient has a pacemaker; baseline QT interval ≥500 ms; or is receiving treatment with Class Ia or Class III anti-arrhythmic drugs.