When you hear the phrase "driving under the influence" or you hear about someone being arrested for DUI, it's likely that you automatically picture someone who is drunk because they had a few too many alcoholic beverages. Most people think of DUIs this way: a person drinking too much alcohol. But there is another way that anyone can receive a DUI, and that's driving under the influence of drugs.
Drugs don't even necessarily have to be your typical illicit substances, such as cocaine or heroin, in this context. A prescription for your doctor could lead to a charge for driving under the influence of drugs. Even certain over-the-counter medications could lead to such a charge if consumed in too great of a quantity.