True or False: Common medicines for colds can make you sleepy.

The statement that common medicines for colds can make you sleepy is true. Many over-the-counter cold medications, especially those that contain antihistamines, are known for their sedative effects. Antihistamines work by blocking histamine, a substance in the body that can cause allergy symptoms. One of the side effects of certain antihistamines is drowsiness, which is why they are often included in nighttime cold formulas.

In addition to antihistamines, other ingredients in cold medicines may also contribute to sleepiness. For example, some cough syrups may contain sedating agents as well. Consequently, it is crucial for users of these medications to monitor their reactions and consider the impact on activities that require alertness, such as driving.

Understanding this effect is especially important for commercial drivers and others whose ability to operate vehicles safely would be impaired by drowsiness. Thus, awareness of how these medications can affect one's alertness is a vital consideration when choosing to use them.