Alcohol and drugs
Your doctor has prescribed a medicine that makes you drowsy. How does California's DUI law treat it?
- The same as an illegal drug, if it affects your ability to drive safely. Correct answer
- As exempt, because a doctor prescribed it.
- As a drug only if you take more than the dose you were prescribed.
Why
The handbook removes the distinction most people lean on: in the eyes of the law a pill from the pharmacy counts the same as something bought on the street. What counts is the effect. Driving impaired is illegal whether what impairs you is alcohol or a drug, and the handbook counts prescriptions and over-the-counter medicines in that second group, along with any mix of the two that leaves you less able to drive safely. So a prescription in your pocket is not a defense, and neither is taking exactly the dose you were told to take. The duty it puts on you is to check the label and understand what the drug will do to you before you drive. It even names cough syrup among the things that carry alcohol.
Where this comes from
California Driver's Handbook, June 2025 edition. The correct answer is The same as an illegal drug, if it affects your ability to drive safely.
- Section 9. Alcohol and Drugs, page 72
The rule behind this one
California alcohol and drug rules for drivers goes through the whole topic, with the page of the California Driver's Handbook behind every rule.
More on alcohol and drugs
- What does the handbook say about how age affects a driver's tolerance to alcohol?
- After a DUI stop you agreed to a preliminary alcohol screening (PAS) and a breath test. Can you still be required to take a blood or urine test?
- In which of these vehicles does the open container rule for alcohol NOT apply to a passenger?
- You are 35, not on DUI probation, and drive for a ride service, carrying a passenger who pays for the trip. At what blood alcohol concentration (BAC) does it become illegal for you to drive?