Two on a blister card - Hangover stopper. Cleans out your system of all those impurities that cause hangovers. Not a drug, therefore FDA approval not required. Sob'r-K works much like a filter. It is high quality vegetable carbon (activated charcoal). This is only a hangover remedy. It does not stop the effects of alcohol. What causes hangover are the toxins (congeners) not the alcohol. Blank.