Remedy known as "having a counter-beer" in German (4,2,3,3)
I believe the answer is:
hair of the dog
(Other definitions for hair of the dog that I've seen before include "Morning tipple after night of excessive drinking" , "Maybe one in the morning" , "Treatment for bad head" , "'...that bit one' completes a dubious hangover remedy" , "Hangover-curing drink" .)