A new, higher-dose nasal spray for reversing opioid overdoses did not save more lives than the previous standard dose, but it did cause more vomiting and other side effects, researchers wrote in a study published Thursday. The 8-milligram naloxone spray — twice as potent as the highest dose previously available — was approved two years ago after pressure from experts and patient advocates who noted lower-dose antidotes often were being given multiple times to people suffering overdoses. The new study, which was limited to more rural parts of New York state, is being called the ...