The U.S. Food and Drug Administration has a message for anyone considering taking ivermectin to treat or prevent COVID-19: Don’t. The FDA said ivermectin is not an antiviral drug, meaning it isn’t used for treating viruses. It’s only approved for use in humans to combat certain internal conditions caused by parasitic worms and external parasites like headlice. Certain forms of ivermectin are given to animals to prevent heartworm disease and other parasites. Even so, some people have experimented with the version of the drug intended for horses. They ended up being hospitalized. "It’s important to note that these products are...