Which of the following is NOT a potential problem caused by taking medicine while driving?

Taking medication while driving can lead to various impairments, which is why the other options are recognized as potential problems. Lengthened reaction time can occur due to the sedative effects of many medications, causing drivers to respond more slowly to unexpected situations on the road. Similarly, a reduction in mental or physical abilities is a known concern, particularly with medications that can cause drowsiness or affect coordination, impairing a driver's ability to operate a vehicle safely.

Intense or unexpected reactions can also happen, especially with certain medications that may cause side effects that are unpredictable, leading to erratic behavior or sudden changes in a driver's mental state.

In contrast, the idea that medication increases cognitive abilities is misleading. While certain medications can improve focus in individuals with specific conditions, many common medications can hinder cognitive function, making driving dangerous. Hence, the correct answer highlights that increased cognitive abilities are not a potential problem when considering the effects of medication on driving.