Some common over-the-counter cold medicines can cause driver drowsiness.
Correct answer: A – TRUE
Cold remedies, including some antihistamines, may cause drowsiness or otherwise impair safe driving. Federal regulations prohibit being on duty under the influence of a substance to a degree that makes safe vehicle operation impossible. The applicable prescription exception requires a licensed medical practitioner to advise that the substance will not affect the driver’s ability to operate safely.
Source: Vermont Commercial Driver’s License Manual — § 2.22.2, “Other Drugs”, 49 CFR § 392.4(a)(4), (c) – Drugs and other substances


