How can one prevent hangovers?

They can have adverse effects on productivity, health, and well being. Is there an effective remedy?

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Don't ever have more than two drinks over a period of three hours. You are safe to drive, normally, at that level (if the drinks are not extremely strong ones). If you MUST drink, always drink a glass of water for every alcoholic beverage you consume.

You could also choose to drink ginger ale.