A Phoenix-area man is dead and his wife is under critical care after the two took chloroquine phosphate in an apparent attempt to self-medicate for the novel coronavirus, according to hospital system Banner Health. Chloroquine has been touted by President Donald Trump as a possible treatment for Covid-19, but it's also "an additive commonly used at aquariums to clean fish tanks," Banner Health said in a statement. Chloroquine is approved by the Food and Drug Administration for treating malaria, lupus and rheumatoid arthritis. But the FDA has not approved it to treat the coronavirus. Banner Health...