Suboxone is an FDA-approved medication used to treat opioid addiction, panic attacks, anxiety, and daytime sleepiness. Suboxone is useful for both adults and children but pregnant women cannot take suboxone because it shows signs of withdrawal in newborns. It works instantly like 20- 30 minutes after the first dose. It is also helpful to cancer patients. You can take suboxone with or without water. Memory loss is the most severe side effect of suboxone.