Among the medications of greatest concern for drivers are benzodiazepines, which are commonly prescribed to treat anxiety and insomnia. Active ingredients such as lorazepam, diazepam, alprazolam, clonazepam, and delorazepam may cause sedation and significantly slow reaction times.
One important consideration is that their effects may last longer than expected. A dose taken in the evening can still impair driving the following day, particularly with long-acting medications or when combined with fatigue, alcohol, or other medicines.
Opioids, Antihistamines, and Other Medications Under Review
Certain pain medications can also affect driving safety. Opioids such as morphine, oxycodone, tramadol, codeine, and fentanyl may impair perception, coordination, judgment, and reaction time.
Drivers should also exercise caution with some cough and cold medicines, as they may contain ingredients with sedative effects.
Other medication categories that require particular attention include:
- Certain antiepileptic drugs
- Barbiturates, such as phenobarbital
- First-generation antihistamines with sedative properties
Even medical cannabis, when legally prescribed, requires special care because the presence of THC can impair the abilities needed for safe driving.
