Tianeptine, found at convenience stores, at smoke shops and online, can mimic an opioid. It is among a growing class of substances that are difficult to control.
Singulair, now a generic, is still used by millions of people in the United States even after thousands of patients and dozens of studies have described harm.
The agency plans to authorize Florida to purchase medicines directly from wholesalers in Canada, where prices are far cheaper. Pharmaceutical companies oppose the plan.
Federal health officials and other experts have repeatedly sought to counter erroneous comments about the vaccines by Dr. Joseph Ladapo, Florida’s surgeon general.