Over-The-Counter Drugs
Many over-the-counter drugs produce drowsiness in some people that can affect their driving. Drivers should read the labels and be especially careful with antihistamines, other cold preparations, or any medicine that relaxes or promotes sleep.
Any Drug
Any drug you take might affect your ability as a driver. If you take more than one drug, or if you mix drugs (especially tranquilizers or other sedative-hypnotics) with alcohol, you could be asking for trouble - on the road and off. If you have doubts about a particular drug or drug mix, check with your doctor or pharmacist.
Alcohol
Each year alcohol, a depressant drug that affects coordination, judgment, perception, and emotional state, is responsible for nearly half of all American highway deaths. Alcohol increases the depressant effects of tranquilizers and barbiturates. Mixing these drugs, on or off the road, can be extremely hazardous.