For the first time, federal health officials are taking aim at telehealth companies promoting unofficial versions of prescription drugs — including popular weight loss medications — as part of the Trump administration’s crackdown on pharmaceutical advertising.The Food and Drug Administration on Tuesday posted more than 100 letters to various drugmakers and online prescribing companies, including Hims & Hers, which has built a multibillion-dollar business centered around lower-cost versions of blockbuster ob ...