10/07/2014 11:00 AM EDT

Anyone who operates a vehicle of any type—car, bus, train, plane, or boat—needs to know there are over-the-counter medicines that can make you drowsy and can affect your ability to drive and operate machinery safely.Over-the-counter medicines are also known as OTC or nonprescription medicines. All these terms mean the same thing: medicines that you can buy without a prescription from a healthcare professional. Each OTC medicine has a Drug Facts label to guide you in your choices and to help keep you safe. OTC medicines are serious medicines and their risks can increase if you don’t choose them carefully and use them exactly as directed on the label.