Naloxone Hydrochloride for Injection 0.4 mg SDV 1 mL Vials x 25 Per trayNaloxone Hydrochloride for Injection 0. 4 mg SDV 1 mL Vials x 25 Per tray is a medication used for the treatment of opioid overdose. Each vial contains 0. 4 mg of naloxone hydrochloride, an antidote that can reverse the effects of opioids and can help restore normal breathing in individuals experiencing an overdose. The medication is packaged in single dose vials (SDV) and there are 25 vials in each tray. This medication is typically administered by