Type 2 Diabetes

You’re right! DVLA are quite fussy about gliclazide. This is because in a very small number of people it can cause a person’s blood sugar level to unexpectedly go lower than it should which can cause erratic behaviour or even impaired consciousness in extreme cases.
The DVLA rules say that a person taking gliclazide has to do a finger prick test within two hours before starting to drive and then every two hours whilst driving. It’s a shame because in the majority of people gliclazide never causes unexpectedly low blood sugars but the diabetes experts who advise DVLA feel that they should make this a requirement because of the minority who could become incapacitated and crash.
Sometimes an easier option is to ask your doctor for one of the newer types of diabetes tablet which don’t require two hourly monitoring.