Having diabetes does not prevent you from driving or renewing your driving licence. What Spanish regulations require is a favorable medical report and a shorter licence validity period. With diabetes treated with insulin or blood-glucose-lowering medication, an ordinary licence (car and motorcycle) can be renewed for a maximum of five years; a professional licence, for one or three years depending on the treatment.
The regulation governing this is the General Drivers’ Regulation, approved by Royal Decree 818/2009, specifically section 8 of Annex IV, concerning metabolic and endocrine diseases. Its current wording comes from Order PRA/375/2018, which has been in force since May 2, 2018.
What really determines the outcome of the medical examination is not the diagnosis but hypoglycemia. To understand the thresholds used by the regulation, it is helpful to be clear about what level is considered hypoglycemia, because the regulation does not refer to figures but to consequences.
Where the rumor that the DGT does not renew driving licences for people taking insulin comes from
If you search for this topic on Google, you will come across headlines such as “the DGT will not renew the driving licence of people who take insulin.” The source of the confusion lies in how the table in Annex IV is structured: it has four columns, not two.
The first two set out the ordinary criteria, and here the wording is unequivocal: there must be no diabetes with severe metabolic instability requiring hospital care, nor diabetes treated with insulin or blood-glucose-lowering medication. Read on its own, this appears to be a prohibition.
The next two set out the extraordinary criteria, and these are the ones applied in practice to almost everyone. There, the regulation literally states that whenever treatment with insulin or blood-glucose-lowering medication is necessary, a favorable medical report must be provided certifying adequate control of the disease and adequate diabetes education for the applicant.
Translated: treatment does not exclude you; it directs you through the medical report route. Anyone who reads only the first column concludes that there is a prohibition when there is actually a procedure.
How long does your license last if you have diabetes?
This is the table that almost nobody consolidates in one place, with the exact periods set out in Annex IV:
| Situation | License group | Maximum validity period |
|---|---|---|
| Treatment with insulin or glucose-lowering medication | Group 1 (AM, A1, A2, A, B, B+E) | 5 years, reducible at the physician’s discretion |
| Type 2 diabetes treated with glucose-lowering medication, without insulin | Group 2 (C1, C, D1, D and their +E categories) | 3 years |
| Type 1 diabetes, or type 2 diabetes requiring insulin | Group 2 | 1 year, and only in very exceptional cases |
| Hypoglycemic episodes during waking hours | Group 1 | 1 year, after 3 months without episodes |
| Hypoglycemic episodes during waking hours | Group 2 | Not permitted |
Group 1 is the car and motorcycle license. Group 2 is the professional license: trucks, buses, and their trailers. This distinction runs throughout the regulations and explains why two people with the same diabetes receive such different answers at the medical assessment center.
What the medical report must say
The regulation requires two specific things in the report, and both appear in the text: that it certify the adequate control of the disease and the applicant’s adequate diabetes education. The second is often overlooked and accounts for half the requirement: it is not enough to have good numbers; you must demonstrate that you know how to recognize and treat a low.
For Group 2, the regulation adds a detail: the report must come from the doctor who monitors your condition, not just any physician. In practice, this means the endocrinologist or family doctor who manages your diabetes.
Without that report, the medical assessment center cannot issue a pass certificate. It is not that they deny it because you have diabetes; they are missing the document the regulations require to apply the exceptional criteria.
Hypoglycemia is what really keeps you from qualifying
The regulation defines two concepts precisely, and everything else depends on those two definitions. Severe hypoglycemia is hypoglycemia that requires another person’s assistance. Recurrent hypoglycemia is severe hypoglycemia occurring within a 12-month period.
It is not about mg/dL or how you feel, but about whether you needed someone to help you. That is the legal dividing line, and it is why two people with the same glycated hemoglobin can end up with different validity periods.
For hypoglycemic episodes that occur during waking hours, the exceptional Group 1 pathway requires at least three months without episodes and a duly justified favorable medical report certifying awareness of hypoglycemia. In Group 2, the wording is simple: they are not permitted.
The fact that the regulations are so strict about this has a statistical basis. According to the DGT magazine, the factor most strongly associated with accident risk in people with diabetes is a recent history of severe hypoglycemia, regardless of the type of diabetes or treatment, and the measured relative risk ranges from 12% to 19% higher than that of other drivers.
What the DGT recommends for everyday life
Beyond the general guidance, the DGT publishes specific guidelines for driving with diabetes. The most specific and least-known one is a threshold: do not drive with glucose at or below 5 mmol/L, equivalent to 90 mg/dL, or when the continuous monitor shows a downward trend toward the hypoglycemia range. Below 54 mg/dL, this is considered level 2 hypoglycemia, and immediate action is required.
The remaining official recommendations are as follows:
- Check your blood glucose before setting off, and do not drive if your level is low.
- Stick to meal, medication, and rest schedules, because skipping them is what causes most episodes of low blood sugar while driving.
- Plan long journeys with traffic jams and unexpected stops in mind.
- Protect your medication from cold and heat while traveling.
- Take extra precautions after a dose or treatment change until your levels are under control.
- Stop at the first symptom and treat the low before continuing.
On that last point, the part people forget is what comes afterward: after treating hypoglycemia, you should not resume driving immediately. You need to wait for your glucose to recover and for your brain to function normally again, which takes longer than the meter reading. If you have doubts about what to do in the event of hypoglycemia, it is advisable to have the protocol firmly established before you need it.
What should you keep in the glove compartment?
The DGT recommends always keeping carbohydrate-rich foods in the car and mentions cookies, sweets, or fruit juice. The recommendation is sound in principle and somewhat outdated in practice, because these formats have two problems inside a vehicle: they spoil in the summer heat and do not allow you to know how much glucose you are taking.
For a glove compartment, fast-acting glucose tablets work best: pure glucose, an exact dose per unit, no fats or proteins to slow absorption, and a shelf life of years that can withstand being forgotten in the car. The standard protocol is 15 grams, wait 15 minutes, and measure again before resuming driving.
And one recommendation that does not appear in any regulation: carry a second spare supply, not just one dose. Being stuck for a long time with your medication in use and nothing to take is exactly the situation the regulation aims to prevent.
Before going to the medical examination center
Four things that can save you a second visit. Request the report from your endocrinologist or family doctor in advance and check that it expressly mentions disease control and your diabetes education. Bring your latest test results and, if you use a sensor, your download reports. Be honest about severe hypoglycemia episodes in the past year, because hiding them does not change the law and could put you at risk if something happens. And if you drive for work, ask from the outset about Group 2, which is governed by different criteria.
This article summarizes the current regulations and official recommendations, but it does not replace the assessment of the medical examination center or your healthcare team, who are responsible for evaluating your individual case. The regulations are also amended periodically, so when renewing your license, it is advisable to confirm the text currently in force.
