Agency says ketamine should only be used in a health care setting, under supervision

Authors urge greater transparency of study results for drugs approved by the FDA

Disposable e-cigarettes are sold in flavors known to appeal to children and teenagers, including bubblegum and cotton candy

Xylazine -- used to sedate large animals such as horses and deer -- is sold on the street under the names tranq, Philly dope, and zombie drug

Agency has faced criticism from antitobacco advocates, the industry, and lawmakers for its past work in cigarette and vaping regulation