Final answer:
Medications that cross the blood-brain barrier commonly cause sedation and restlessness, but not hyperactivity.
Step-by-step explanation:
Medications that cross the blood-brain barrier may have certain side effects. One of the common side effects is sedation, which refers to a calming or sleep-inducing effect. Another side effect is restlessness, which is characterized by the inability to stay still or a feeling of agitation. On the other hand, hyperactivity is not commonly caused by medications that cross the blood-brain barrier, as these medications usually have a calming effect on the brain.
Learn more about Side effects of medications that cross the blood-brain barrier