Nasal spray-type naloxone (Narcan) opioid overdose trainer. Five-pack. Please note: This training device is used to allow opioid overdose responders to train on the proper administration of 4mg of Naloxone (Narcan). This training device does not atomize liquid. It is spring-loaded to allow for repeated use for training. This trainer contains no actual medicine and is not for use in rescuing an opioid overdose victim.