Which of the following is correct about medicine used to treat the common cold?

Laws prohibit possession or use of many drugs while on duty. They prohibit being under the influence of any controlled substance, amphetamines, narcotics, or any other substance, which can make the driver unsafe. This could include a variety of prescription and over-the-counter drugs (cold medicines), which may make the driver drowsy or otherwise affect safe driving ability. [California Commercial Driver Handbook]