Given their effects on the nervous system, one side effect of over-the-counter cold remedies is increased:

Question

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Many over-the-counter cold remedies contain ingredients that stimulate the sympathetic nervous system, which can result in an increase in heart rate. This is because the sympathetic nervous system is responsible for the "fight or flight" response, which raises heart rate among other things. A and B are not commonly reported side effects of cold remedies, and D is actually a desired effect for people with sinus congestion.

Given Their Effects on the Nervous System, One Side Effect