A study conducted by researchers at Queensland University of Technology in Australia show that driving while affected by prescription and over-the-counter medications had the potential to be as dangerous as driving under the influence (DUI) of alcohol or other illegal drugs.
While medications carry warning labels about the dangers of driving while using those medicines, few people pay enough attention to these advices. The research showed that drivers were often unable to accurately self-assess their impairment when taking medication and were overconfident in assessing their abilities. Many drivers think that the impairing effects of medicines only occur when they are used excessively, or taken in excess, but that is not the case.
Though individual responses can vary, generally medications can cause a variety of impairments including drowsiness, increased reaction time, loss of mental concentration, shakiness and affect coordination and these all make it unsafe to drive, cycle or use machinery.