ADHD, Medication and Driving

Two separate questions

People arrive here worried about one thing and leave confused because two different rules are being discussed at once.

The first is a licensing question: does the DVLA need to know you have ADHD. The second is a criminal law question: does taking prescribed stimulant medication put you at risk under the drug driving law. They are governed by different rules and have different answers.

The short version is that not everyone with ADHD has to notify the DVLA, and prescribed medication taken as directed has a statutory defence under the drug driving law. Both of those need unpacking.

Do you have to tell the DVLA about ADHD?

There is no automatic requirement to notify the DVLA simply because you have a diagnosis. The duty arises where a condition could affect your ability to drive safely.

In practice that means considering whether your ADHD, or the medication for it, affects concentration, impulsivity or reaction time to a degree that would impair driving. For many people, particularly once treated, it does not. For some it does.

The DVLA publishes the criteria it applies, and its guidance for medical professionals sets out how ADHD is assessed. If you are unsure, ask the clinician who knows your case, and check the current DVLA guidance rather than relying on what someone was told several years ago.

Prescribed medication and the drug driving law

England, Scotland and Wales have specified limits for a list of controlled drugs while driving. Amfetamine, which lisdexamfetamine and dexamfetamine relate to, appears on that list, which is why people taking ADHD medication worry about it.

There is a statutory medical defence. If the medicine was prescribed for you, you took it in accordance with the prescriber's instructions and any accompanying information, and your driving was not impaired, the defence applies.

That defence is not a blanket exemption. It does not cover taking more than prescribed, taking someone else's medication, or driving while actually impaired. Driving while impaired remains an offence regardless of whether the substance was prescribed.

• Take the medicine exactly as prescribed
• Keep evidence with you: a repeat slip, prescription copy or pharmacy label
• Do not drive if you feel impaired, whatever the reason
• Do not combine with alcohol and drive, in any circumstances
• Tell the police at the roadside that the medicine is prescribed

How to declare, if you need to

If you decide the DVLA needs to know, the process is administrative rather than adversarial, and declaring does not put your licence on hold while it is considered in most cases.

• Notification is made to the DVLA directly, by the licence holder
• GOV.UK sets out the current forms and the medical conditions they cover
• The DVLA may write to the clinician who knows your case for further information
• You can usually continue driving while a decision is made, subject to advice
• Tell your insurer once you have declared, so cover is not affected

The commonest mistake is assuming a clinician has done it for you. Notifying is the licence holder's duty. A clinician can advise on whether the criteria are met, and will write to the DVLA if asked, but the initial declaration is yours to make.

The second commonest is relying on out-of-date information. DVLA criteria and the forms themselves change, so check GOV.UK at the time rather than acting on advice from several years ago or from a forum.

Practical points for drivers

A few things come up repeatedly and are worth knowing in advance.

Timing and wearing off

If your medication has worn off by the evening, a long drive home may be harder than the same drive at midday. That is not a legal issue but it is a safety one, and it is a fair thing to raise at review if driving is a regular part of your day.

Early treatment and dose changes

Drowsiness and dizziness are more likely in the first weeks and after a dose increase, particularly with guanfacine. Be cautious about driving until you know how a new dose affects you.

Insurance

Insurers generally ask about notifiable medical conditions. If you have declared a condition to the DVLA, tell your insurer too, since a non-disclosure can affect a claim.

Untreated ADHD is part of the picture

Research has consistently linked untreated ADHD with a higher rate of road traffic incidents. Treatment is not only a risk to weigh, it can also be part of driving more safely, which is worth keeping in view.

• Alcohol Why masking makes drink-driving judgements worse
• How titration works What to expect in the first weeks
• Side effects in full What to watch for, and when to seek help

Common questions