Which of the following is a common side effect of circulatory medications?

Nausea is recognized as a common side effect of various circulatory medications, such as those used to treat hypertension, heart failure, or other cardiovascular diseases. These medications can impact the gastrointestinal system due to their pharmacological action or effects on blood circulation and blood pressure regulation. For some patients, the changes in blood pressure or the way the medication interacts with other bodily systems can result in gastrointestinal disturbances, leading to nausea.

In contrast, the other options do not typically align with the side effects commonly associated with circulatory medications. Increased energy, insomnia, and hyperactivity are not standard outcomes of these medications and may instead be linked to other types of drugs or issues. For instance, increased energy could be associated with stimulant medications, insomnia could stem from certain antidepressants or stimulants, and hyperactivity is generally not a side effect of medications used for circulatory concerns. Thus, nausea stands out as a more validated side effect in the context of circulatory drug therapy.