Short answer: yes, a prescription drug DUI in Arizona is possible even when your doctor prescribed the medication. Arizona’s DUI law has two different drug charges, and a prescription affects them differently. If the state charges you with having a listed drug or its metabolite in your body, using the drug as prescribed by an authorized prescriber is a complete defense to that charge. But if the state charges you with being impaired to the slightest degree by a drug, the prescription is not a defense; the statute says being entitled to use the drug is no defense to the impairment charge. Which charge you face, and what the evidence shows about impairment, decides a great deal.
Your license is on its own clock. A drug DUI arrest can start an MVD suspension. The current text of A.R.S. § 28-1385 gives 30 days to request the hearing; if your notice shows a shorter date, go by the shorter one. Sending a form or making a call does not stop or pause any deadline.
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The two drug DUI charges under A.R.S. § 28-1381
| Charge | What the state must prove | Does a prescription help? |
|---|---|---|
| § 28-1381(A)(1), impaired to the slightest degree | You drove or were in actual physical control while under the influence of any drug, alcohol, or a combination, and were impaired to the slightest degree | No. Subsection (B) says being entitled to use the drug under Arizona law is not a defense. |
| § 28-1381(A)(3), drug or metabolite in the body | A drug listed in A.R.S. § 13-3401, or its metabolite, was in your body while you drove | Yes. Subsection (D) says a person using a drug as prescribed by a licensed, authorized prescriber is not guilty of this charge. |
That is why the words “as prescribed” matter. Taking more than the prescribed dose, taking someone else’s prescription, or taking it in a way the prescription doesn’t allow can take you outside the defense to the (A)(3) charge. And none of it protects against the (A)(1) impairment charge if the evidence shows impairment.
Common medications in drug DUI cases
The (A)(3) charge covers drugs listed in A.R.S. § 13-3401, which covers a range of controlled prescription medications, such as opioid pain relievers, benzodiazepines, some sleep aids and stimulants. A medication does not need to be on that list to support the (A)(1) impairment charge, because (A)(1) covers “any drug.” Over-the-counter medications that cause drowsiness can matter for impairment too, especially combined with alcohol. Marijuana has its own rules; see our marijuana DUI guide.
How impairment gets proven, and challenged
Unlike alcohol, there is no 0.08-style number for drugs. The impairment charge is built from observations and evidence:
- Driving behavior that led to the stop.
- Field sobriety tests, which were designed with alcohol in mind and can be affected by injury, age, fatigue, footwear and Flagstaff’s cold and uneven surfaces.
- A drug recognition evaluation, if one was done, which is a series of observations by a specially trained officer.
- Blood test results, which show a drug or metabolite was present, but do not by themselves prove impairment at the time of driving.
- Your statements, including what you took and when.
A defense lawyer looks at each of these: whether the stop was lawful, whether the evaluation followed protocol, how the blood was collected and tested, and whether the timeline and dosage fit the claimed impairment. You also have the right under A.R.S. § 28-1388(C) to a reasonable opportunity to arrange your own independent test.
The license side: prescriptions and the MVD
The administrative suspension statute, A.R.S. § 28-1385, applies when a test shows a listed drug or metabolite in your body, except if you possess a valid prescription for the drug. The same exception appears in the scope of the MVD hearing. So proof of a valid prescription can matter at MVD as well as in court. If you refused testing, a separate 12-month refusal suspension applies; see refusing a breath or blood test.
Penalties if convicted
A drug DUI under § 28-1381 is a class 1 misdemeanor carrying the same mandatory minimums as an alcohol DUI: at least 10 consecutive days in jail (all but one day can be suspended after completing court-ordered screening and education or treatment), a fine of at least $250 plus assessments, and traffic survival school. For a DUI that did not involve alcohol, the court may order an ignition interlock under § 28-1381(P), rather than it being automatic. A second DUI within 84 months, or aggravating facts, raises the stakes; see second-offense DUI and aggravated DUI.
What to gather this week
- Your prescription records: the bottle or label, pharmacy printout, and the prescriber’s name and contact.
- A dosing timeline: what you took, how much and when, in the 24 hours before driving.
- Medical conditions that could affect field tests, such as injuries, balance or eye conditions.
- Your MVD notice and the hearing request deadline.
- Your court paperwork. Our page on the Flagstaff DUI court process explains which court has the case.
- Don’t discuss the case online or with anyone but your lawyer.
Sleeping it off after taking medication
Arizona’s DUI law covers “actual physical control,” not only driving. Resting in a running car after taking medication can lead to a charge. See our actual physical control guide. If the arrest also involved a drug possession charge, see our Flagstaff drug crimes guide.
Frequently asked questions
Can you get a DUI for a prescription drug in Arizona?
Yes. If the evidence shows you were impaired to the slightest degree by a drug, a prescription is not a defense under A.R.S. 28-1381(B). A prescription does defend against the separate drug-in-the-body charge if you used the drug as prescribed.
What does “as prescribed” mean for the defense?
The defense in A.R.S. 28-1381(D) covers using a drug as prescribed by a licensed practitioner authorized to prescribe it. Taking a higher dose, someone else’s prescription, or using it in a way the prescription does not allow may fall outside it.
Is there a legal limit for prescription drugs like there is for alcohol?
No. Arizona sets no numeric limit for drugs. The impairment charge depends on evidence of impairment, and the drug-in-body charge depends on whether a listed drug or metabolite was present without the prescription defense.
Will I lose my license for a prescription drug DUI?
An MVD suspension can follow a test showing a listed drug, but A.R.S. 28-1385 excepts a person who possesses a valid prescription. Request the MVD hearing before the deadline on your notice and bring proof of the prescription.
Do I need an ignition interlock for a drug DUI?
For a DUI that did not involve alcohol, the interlock is not automatic. The court may order one under A.R.S. 28-1381(P).
What evidence matters most in a prescription DUI case?
The driving behavior, field tests, any drug recognition evaluation, the blood results and their timing, your prescription records and your statements. A lawyer weighs whether that evidence shows impairment at the time of driving.
Related guides
Charged over a prescription? Free and confidential
The difference between the two charges can decide the case. We’ll connect you with an independent licensed Arizona attorney who handles DUI cases in Coconino County.
Sources & Corrections
Primary sources checked for this page on October 18, 2026:
- A.R.S. § 28-1381, DUI; prescription defense; sentencing
- A.R.S. § 28-1385, Administrative suspension; prescription exception
- A.R.S. § 28-1388, Independent test
- A.R.S. § 28-1321, Implied consent and refusal
The types of medications on the A.R.S. § 13-3401 drug list are described generally; the list itself was not reproduced for this page. Check a specific medication with a lawyer or pharmacist.
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Not legal advice. The Flagstaff Legal Resource Center is an independent referral service operated by Wilder West Assets LLC, not a law firm. This page explains general Arizona law to help you prepare to talk with a lawyer. Laws change, and how they apply depends on your facts. No attorney-client relationship is created by using this site. Verify any attorney’s credentials through the State Bar of Arizona.