Nasal spray aimed at tackling gambling addiction to be trialled in Finland The Guardian · January 8, 2018 at 9:42 pm Could gambling addiction be treated with a nasal spray? A group of Finnish researchers are launching a study to find out. The fast-working spray contains naloxone, which is commonly used as an emergency treatment for overdoses of opiates such as heroin, opium and morphine. It blocks the production of dopamine, a neurotransmitter linked to pleasure with a central role in addictions. “The spray goes to the brain in a few minutes so it’s very useful for a gambler … if you crave gambling, just take the spray,” Hannu Alho, professor of addiction medicine at the Helsinki-based national institute for health and welfare, explained.