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Can You Get a DUI in Idaho for Prescription Medications? Understanding the Risks and Legal Implications

Posted by Ryan Black | May 09, 2025 | 0 Comments

Can You Get a DUI in Idaho for Prescription Medications? Understanding the Risks and Legal Implications

When most people think of a DUI (Driving Under the Influence), they often associate it with alcohol or illegal drugs. However, in Idaho, as in many states, you can be charged with a DUI for driving under the influence of prescription medications—even if those medications were legally prescribed to you and taken as directed.

This article aims to shed light on how Idaho law treats prescription drug DUIs, the potential consequences, and what drivers in Boise and throughout the state should be aware of to stay on the right side of the law.

prescription medication dui

Idaho's DUI Laws: Beyond Alcohol

Idaho Code § 18-8004 defines DUI as operating a vehicle while under the influence of alcohol, drugs, or any other intoxicating substances that impair a person's ability to drive safely. The statute does not differentiate between illegal drugs, over-the-counter medications, or prescription drugs. If a substance impairs your driving, it's grounds for a DUI charge.

This means that even if you're taking medication prescribed by your doctor, you can still face DUI charges if that medication affects your ability to operate a vehicle safely.


Common Prescription Medications That Can Lead to DUI Charges

Several prescription medications have side effects that can impair driving abilities. Some of the most common include:

  • Opioid pain relievers (e.g., oxycodone, hydrocodone)

  • Benzodiazepines (e.g., Valium, Xanax)

  • Sleep aids (e.g., Ambien, Lunesta)

  • Muscle relaxants (e.g., Soma, Flexeril)

  • Antidepressants (certain types can cause drowsiness or dizziness)

  • Antihistamines (some can cause sedation)

It's crucial to read the warning labels on your medications and discuss potential side effects with your healthcare provider, especially concerning activities like driving.


How Law Enforcement Determines Impairment

Unlike alcohol, where a blood alcohol concentration (BAC) of 0.08% or higher is a clear indicator of impairment, determining impairment from prescription drugs is more subjective. Law enforcement officers rely on:

  • Observations: Erratic driving, slurred speech, bloodshot eyes, or other signs of impairment.

  • Field Sobriety Tests: Assessing balance, coordination, and cognitive function.

  • Drug Recognition Experts (DREs): Specially trained officers who can identify signs of drug impairment.

  • Blood Tests: To detect the presence of drugs in the system.

However, the presence of a drug in your system doesn't automatically mean you're impaired. The prosecution must prove that the drug affected your ability to drive safely.


Legal Consequences of a Prescription Drug DUI in Idaho

Being convicted of a DUI due to prescription medication carries the same penalties as an alcohol-related DUI:

  • First Offense:

    • Up to 6 months in jail

    • Fines up to $1,000

    • License suspension for 90 to 180 days

    • Mandatory alcohol/drug evaluation and possible treatment

    • Installation of an ignition interlock device
  • Second Offense (within 10 years):

    • Mandatory minimum of 10 days in jail, up to 1 year

    • Fines up to $2,000

    • License suspension for 1 year

    • Installation of an ignition interlock device

  • Third Offense (within 10 years):

    • Felony charge

    • Up to 5 years in prison

    • Fines up to $5,000

    • License suspension for up to 5 years

    • Installation of an ignition interlock device

Beyond legal penalties, a DUI conviction can impact employment opportunities, insurance rates, and personal reputation.


Defending Against a Prescription Drug DUI Charge

If you're charged with a DUI due to prescription medication, several defense strategies might be applicable. At Boise DUI we work with an expert from the research labs at BSU to help screen these cases for defenses:

  • Lack of Impairment: Demonstrating that, despite the presence of the medication in your system, you were not impaired while driving. 

  • Improper Testing Procedures: Challenging the accuracy or administration of field sobriety or blood tests.

  • Medical Necessity: Arguing that the medication was taken as prescribed and necessary for your health, though this doesn't excuse impairment.

Each case is unique, and the viability of these defenses depends on the specifics of the incident.


Best Practices for Drivers on Prescription Medications

To minimize the risk of a DUI charge:

  • Consult Your Doctor: Discuss how a new medication might affect your ability to drive.

  • Read Labels Carefully: Pay attention to warnings about drowsiness or operating machinery.

  • Avoid Mixing Substances: Combining medications or mixing them with alcohol can amplify impairing effects.

  • Monitor Your Response: If you feel unusually drowsy or impaired after taking a medication, avoid driving.


Conclusion

While prescription medications are legal and often essential for health, they can pose risks when it comes to driving. Idaho law doesn't differentiate between impairment from alcohol, illegal drugs, or prescribed medications. If a substance impairs your ability to drive safely, you can face DUI charges.

Being informed about the effects of your medications and exercising caution can help you stay safe and avoid legal complications. If you find yourself facing a DUI charge related to prescription drugs, it's essential to seek legal guidance to navigate the complexities of your case. Give us a call or schedule a free consultation online if there's anything we can do to help.

About the Author

Ryan Black

Attorney, Partner

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