Illinois CDL Practice Exam 2026 - Free CDL Practice Questions and Study Guide

A CDL driver must ensure they are fit to drive safely, especially after taking medication. Consulting with a physician is essential because medications can have varying effects on individuals, and only a healthcare professional can adequately assess how a specific medication might impair driving ability. This consultation helps to determine any potential side effects or risks associated with the medication in relation to driving.

Driving cautiously to assess impairment may not be sufficient or safe, as the effects of the medication could be unpredictable and could lead to dangerous situations. Similarly, ignoring the medication if feeling fine overlooks the fact that some medications can affect an individual’s ability to drive even if they don’t feel their effects immediately. Waiting to see for side effects lacks the proactive approach necessary to ensure the driver's safety as well as the safety of others on the road. Taking a cautious step by consulting a physician is the most responsible course of action.