I have been on Glic for over 20 years as diet alone does not produce good enough control. I agree with the approach suggested by
@woodywhippet61 of using testing to see the effect of various foods on your sugars - in my experience, that information has allowed me to keep my medication dose as low as possible and stable by using the info to modify my diet as the responses change
Gliclizide can put your sugars too low so you need to be testing your blood sugars, particularly before bed and before driving. Ive had a few hypos in my time but nothing that I havnt been able to sort out and familiarity with the drug has meant I now rarely have any hypos as I know what effect different meals / activities etc have
If you are in the UK, then because Glic can put sugars low, you should be prescribed blood glucose testing strips and a meter by your GP - quote NICE guidance if you have any problems
Gliclizide modified release is less likely to cause hypos than ordinary Gliclizide so get that if you can
Regrding weight gain - some people gain a few pounds, some dont - I havnt seen any weight gain that can be related to Gliclizide - my personal theory is that keeping the dose of Gliclizide as low as necessary to produce acceptable blood sugars and combining it with dietary intervention Is the best way to avoid significant weight gain and diabetes progression