A valid prescription does not automatically mean you are safe to drive. Although driving while taking some prescription medications is legal in Maryland, you can face impaired-driving charges if a drug affects your ability to operate a vehicle safely. The issue is not simply whether you were legally prescribed the medication. Police and prosecutors focus on whether the drug, alone or in combination with another substance, allegedly impaired your driving.
Can You Get a DUI From Prescription Medication?
Yes. Maryland’s impaired-driving laws are not limited to alcohol or illegal drugs. A driver may face charges when police believe prescription medication impaired their ability to drive safely. That can include medication taken exactly as prescribed.
The fact that a doctor authorized the medication can provide important context, but a prescription is not a complete defense to impaired driving. The central question is how the medication allegedly affected you when you were behind the wheel.
Which Prescription Drugs Can Affect Driving?
Many medications can cause side effects that affect driving performance. These may include certain opioid pain medications, anti-anxiety drugs, sleep aids, muscle relaxants, and other medications that cause drowsiness, dizziness, slowed reactions, or coordination problems.
The effects also vary significantly from person to person. A medication that causes substantial drowsiness in one patient may affect another very differently.
Interactions can complicate the issue further. Combining medication with alcohol, another prescription, or an over-the-counter drug may produce effects that would not occur when the medication is taken alone.
How Do Police Determine Whether Prescription Medication Impaired You?
Unlike alcohol-related DUI cases, prescription-drug cases generally do not have a universal numerical threshold comparable to a .08 blood alcohol concentration.
Police instead may rely on driving behavior, physical appearance, speech, coordination, field sobriety tests, statements about medication use, and other observations.
In some cases, a Drug Recognition Expert (DRE) may conduct an evaluation intended to identify signs associated with different categories of drugs. Police may also seek a blood sample to determine which substances were present.
The presence of medication, however, does not necessarily establish that it caused impairment.
Does a Positive Blood Test Prove You Were Impaired?
Not necessarily.
A blood test may establish that a medication was present in your system, but that is different from proving it prevented you from driving safely.
Some prescription drugs remain detectable after their most significant effects have diminished. Other medications may be taken regularly, meaning the driver’s body has developed tolerance to certain side effects.
That makes context important. Prosecutors may attempt to connect the laboratory result with officer observations, driving behavior, field sobriety performance, and other evidence to establish impairment.
A defense can examine whether those pieces actually support that conclusion.
What if a Medical Condition Caused the Signs of Impairment?
This can become a significant issue in prescription-medication DUI cases.
The medical condition for which you take medication may itself affect balance, coordination, speech, movement, or appearance. Injuries, neurological conditions, anxiety, fatigue, and other health issues can also influence performance on roadside tests.
An officer may interpret those symptoms as evidence of drug impairment without knowing the driver’s medical history.
Medical records and other evidence may therefore provide an alternative explanation for observations documented during the traffic stop.
How Are Prescription Medication DUI Charges Defended?
These cases often require separating drug presence from actual impairment.
A defense may examine whether the traffic stop was lawful, whether field sobriety tests were appropriate given the driver’s health, how the DRE evaluation was performed, and whether blood testing supports the conclusions prosecutors draw from it.
Prescription records, medical history, body-camera footage, and evidence of how the driver was actually operating the vehicle may all help provide a more complete picture.
A Prescription DUI Case Requires More Than a Positive Test
Taking medication prescribed by your doctor does not automatically make driving illegal, and finding that medication in your system does not by itself explain whether you were impaired. The State still must establish the connection between the drug and your ability to drive safely.
If prescription medication has become the basis for a DUI charge in Maryland, Hartman Attorneys at Law can help. Connect with us today.