Drug Driving Rules and Tests in Spain

Spain has zero tolerance for drug driving. Any detectable amount of a drug in your system is prohibited, with one exception: a substance taken under a valid medical prescription and used as directed. Police can stop you and run a roadside saliva test at any time. If it is positive, the penalty is 1,000 euros and 6 points off your licence. This guide explains the rule, the medical exception, how testing works, and what happens if you fail.

What is the drug driving rule in Spain?

The rule is simple and strict. In Spain it is illegal to drive with any detectable amount of a drug in your body. Unlike alcohol, there is no legal "limit" you can stay under. The only exception is a substance you take on a valid medical prescription, used exactly as your doctor directed.

This covers illegal drugs such as cannabis, cocaine, amphetamines, opiates and similar substances. It also covers unprescribed use of medicines that affect your ability to drive. The DGT treats driving under the influence of drugs as one of the most serious risks on the road, alongside drink driving.

Because the standard is "any detectable amount", timing matters. Some drugs stay traceable in saliva for many hours or even days after use, long after any obvious effect has worn off. You can test positive when you feel completely normal.

This topic comes up regularly in the theory exam. If you are preparing in English, see our DGT theory test in English guide for how alcohol and drug questions are framed.

What about prescribed medicines?

There is one exception to the zero tolerance rule: substances taken under a valid medical prescription. If a doctor has prescribed a medicine and you take it as directed, you are not committing the drug driving offence, even if the medicine would otherwise show up.

That said, the exception is narrow. It applies to prescribed use, not to borrowing someone else's medication or taking more than prescribed. And it does not remove your wider duty to drive safely. If any medicine, prescribed or not, leaves you unfit to drive, you should not be at the wheel.

Keep proof with you. If you are stopped and test positive because of a prescribed medicine, being able to show a valid prescription helps you explain the result. Carrying the prescription or a copy is a sensible precaution.

Many common medicines carry a warning about driving. The next section on labels explains what to look for before you get in the car.

How does roadside drug testing work?

Testing happens in two stages. First, at the roadside, an officer takes a saliva sample using a screening device. This gives a quick preliminary result showing whether drugs appear to be present. The check is fast and done on the spot.

If the roadside screen is positive, a second saliva sample is taken and sent for laboratory analysis. The lab result is the one that confirms the offence. This two-step process, a quick roadside screen followed by lab confirmation, is designed to make sure a sanction rests on a reliable result, not just the initial device.

Police can run these checks during routine controls, at checkpoints, or after an incident. You do not have to be driving erratically to be tested. Spain runs regular drug and alcohol campaigns, and any driver can be asked to provide a sample.

One point matters more than any other here: you must cooperate. Refusing to take the test is treated as a very serious offence in its own right, and the consequences can be worse than a positive result.

What are the penalties for drug driving?

Testing positive for drugs carries an administrative penalty of 1,000 euros and the loss of 6 points from your licence. Six points is a heavy deduction. A standard licence holds 12 points, so a single offence removes half of them, and new drivers, who start with 8 points, lose most of their balance at once.

The stakes rise if you refuse the test. Refusing to undergo drug or alcohol testing is a very serious offence and can be treated as a crime, not just a traffic fine. In practice, refusing is never a way to avoid the consequences; it usually makes them worse.

Losing points has knock-on effects. If your balance reaches zero, your licence is suspended and you have to complete a re-education course to recover points. To understand how the balance works and how to rebuild it, read our Spain penalty points system guide.

The drug rules sit alongside the alcohol rules, which work differently because they use measured limits. For those, see our drink driving limits in Spain guide.

Which medicines affect driving? Check the label

Many everyday medicines can affect your driving even when they are legal and prescribed. Strong painkillers, some allergy tablets, sleeping aids, anxiety medication and certain cough or cold remedies can all cause drowsiness, slower reactions or reduced concentration. Reading the label before you drive is the simplest way to stay safe.

In Spain, medicine packaging that can affect driving carries a warning pictogram: a black car inside a red triangle. When you see it, read the leaflet, and if it advises against driving, do not drive until the effect has passed. Ask a pharmacist if you are not sure.

A few practical habits help. Do not mix medicines with alcohol. Do not assume that "over the counter" means safe to drive on. And give a new medicine time before you rely on driving, so you know how it affects you.

These points show up in theory questions about driver fitness and medicines. You can practise them in our full mock exams in English.

Frequently asked questions

Is there a legal drug limit for driving in Spain?

No. Unlike alcohol, there is no threshold you can stay under. Any detectable amount of a drug is prohibited, with the sole exception of a substance taken under a valid medical prescription and used as directed.

What is the penalty for drug driving in Spain?

Testing positive carries a 1,000 euro fine and the loss of 6 points from your licence. Because a standard licence holds 12 points, one offence removes half of them at once.

Can I refuse a roadside drug test?

You should not. Refusing a drug or alcohol test is a very serious offence in its own right and can be treated as a crime. The consequences of refusing are usually worse than a positive result.

How does the roadside drug test work?

An officer takes a saliva sample with a screening device for a quick preliminary result. If it is positive, a second sample is sent to a laboratory. The lab analysis is what confirms the offence.

Can prescribed medicine make me fail a drug test?

A prescribed medicine used as directed falls under the medical exception, so it is not the drug driving offence. Carry proof of the prescription. Even so, if a medicine leaves you unfit to drive, you should not drive.

Sources

• Reglamento General de Circulacion (Real Decreto 1428/2003).
• DGT, permiso por puntos.

Last updated: August 2026.