Houston DWI on Prescription Drugs Attorney | Houston Criminal Defense Attorneys PLLC

At Houston Criminal Defense Attorneys PLLC, we understand that facing a DWI charge involving prescription drugs can be a confusing and overwhelming experience. You may be wondering, "Can I really be arrested for DWI if I'm taking medication prescribed by my doctor?" The answer, unfortunately, is yes. Even though the substance is legal and prescribed, driving under the influence of certain prescription medications can still result in a DWI charge. Prosecutors even write articles on how to convict people in these types of cases.

Understanding DWI Prescription Drug Charges

Prescription drugs fall into two primary categories when it comes to DWI cases: Central Nervous System (CNS) depressants and narcotic analgesics.

CNS Depressants: Medications like benzodiazepines (such as Xanax or its generic, alprazolam) are prescribed for anxiety and other conditions, but they can impair your ability to drive by slowing your reaction time and affecting your speech, much like alcohol.
Narcotic Analgesics: Medications like hydrocodone are often prescribed for pain. Many people take these without realizing how much they impair their ability to drive, leading to unintentional DWI charges.

Even if you are taking these medications exactly as prescribed, the law looks at whether your mental or physical faculties were impaired while driving, not whether you were taking them legally or at a therapeutic level.

Prescription Drugs and DWI: What the Law Says

In Texas, the penalties for driving under the influence of prescription drugs are the same as those for alcohol-related DWI charges. For a first-time DWI, this means you could face:

Class B misdemeanor charge
72 hours to 180 days in jail
Up to a $2,000 fine

For repeat offenses or cases involving more severe impairment, the penalties increase significantly, including potential felony charges that could result in years of imprisonment and heavy fines.

The key is the definition of Intoxication in the penal code.

"Intoxicated" means: (A) not having the normal use of mental or physical faculties by reason of the introduction of alcohol, a controlled substance, a drug, a dangerous drug, a combination of two or more of those substances, or any other substance into the body; or (B) having an alcohol concentration of 0.08 or more.

Because the law says a "drug" or "any other substance" this means that anything that causes you to lose the normal use of your mental or physical faculties can be deemed an intoxicating substance that makes operating a motor vehicle illegal.

How We Defend Prescription Drug DWI Cases

At Houston Criminal Defense Attorneys PLLC, we know that a DWI charge doesn't always tell the full story. Our defense strategies for DWI prescription drug cases focus on several key areas:

Therapeutic Levels: If blood test results show that the medication was within the therapeutic range, meaning you took it as prescribed, this could be something that is used to show that you did not lose the normal mental or physical faculties because of the medicine. Family or friends that can testify you act normally when on the medication can also help.
No Intent to Impair: While DWI cases don't require proof of intent, we work to show that you were not intentionally driving impaired and that any effects were unexpected and unintentional. This also is a mitigating factor that can influence prosecutors, judges, or jurors.
Medical Conditions: If you have an existing medical condition that affects your physical abilities, such as difficulty walking or balancing, we'll make sure the court understands how this may have impacted your field sobriety tests.
Drug Recognition Expert (DRE): Without a trained Drug Recognition Expert on scene, the prosecution may lack crucial evidence to prove the impairing effects of prescription drugs. If no DRE evaluated you, this could weaken the state's case and lead to reduced charges or even a dismissal.

What to Do If You're Facing a Prescription Drug DWI Charge

If you or someone you know has been charged with DWI due to prescription drug use, it's essential to act quickly. A skilled criminal defense attorney can help you navigate the legal process, gather critical evidence, and build a defense tailored to your specific situation.

At Houston Criminal Defense Attorneys PLLC, we have the experience and knowledge to help you achieve the best possible outcome. Don't face these charges alone—contact us today to schedule a consultation and protect your rights.

Frequently Asked Questions

Can you get a DWI on prescription drugs in Texas?

Yes. Texas DWI law is not limited to alcohol. Under Penal Code § 49.04, you can be charged with DWI if any substance — including a legally prescribed medication — causes you to lose the normal use of your mental or physical faculties. Common culprits include sleep aids, anti-anxiety medications, opioids, and muscle relaxers.

Is having a valid prescription a defense to DWI?

Not by itself. A valid prescription makes possessing the medication legal, but it is not a defense to driving while impaired by it. That said, the prescription and how the medication actually affects you are important parts of the case — and the State still has to prove you were actually impaired while driving.

How does the State prove a prescription-drug DWI?

Because there is no 'legal limit' for most medications the way there is 0.08 for alcohol, the State must prove actual impairment. It typically relies on the officer's observations, field sobriety tests, a blood test, and sometimes a Drug Recognition Expert (DRE). Each of those is subjective or contestable, which creates real defense opportunities.

How is a prescription-drug DWI defended?

We challenge whether you were actually impaired (as opposed to tired, ill, or nervous), attack the traffic stop and the blood draw and its testing, question DRE conclusions, and show that the presence of a drug in your system does not prove impairment at the time of driving. Blood tests in particular are frequently vulnerable.

Does a drug in my blood prove I was impaired while driving?

No. A blood test can show a substance was present, but presence is not the same as impairment, and many medications remain detectable long after any effect has worn off. The State must connect the drug to actual impairment at the time you were driving — a link that is often weak and defensible.