The controversial coronavirus drug that a Hasidic doctor has been using to treat hundreds of people with moderate symptoms in upstate N.Y. is also being tried by doctors in at least three other states, and New York health officials have started using it to treat critically ill patients in hospitals. The expansion in the use of the drug, the anti-malarial hydroxychloroquine, comes despite concern that its effectiveness in treating Covid-19 has not been tested in a controlled clinical study, and that demand for it could cause shortages that prevent access by people with other diseases who need it. Its embrace...