What is an alcoholic drink taken to cure a hangover?

The best cure for a hangover is to go swimming the next morning. (A shower or a bath wont do it, you need to immerse yourself in a deep pool) This is because the worst symptoms of a hangover - nausea and headache - are due to shrinkage of the brain due to dehydration. Total immersion in a swimming pool compresses and shuts down the capillaries of the skin increasing perfusion of your brain and kidneys. Try it.