The mystery gas used in Moscow during the hostage rescue likely is not fentanyl, as claimed by Russian health officials, but could be from a class of anesthetic gases that includes halothane, commonly ...

Is it safe to be exposed to halothane gas during the first trimester of pregnancy? I sometime assist during surgery, and although all care is taken, a bit of halothane can be smelled at times in the ...

Further clues to the identity of the knock-out agent used to end the Moscow hostage crisis have emerged, indicating that a likely candidate is a cocktail of an opioid narcotic such as fentanyl ...