Gluciphage is metformin & has few gastrointestinal side effects - same as Diamicron which is gliclazide
also having GI side effects
at high doses 45 mg equivalent upto 2-3 y of treatment is associated with baldder cancer, its sister drug Rosiglitazone
is completely banned for this reason.
At 7.5 mg dose you should not worry re cancer unless there is family history of bladder cancer
OR there are other risk factors ( smoker, work in dye & leather industry) - in fact at 7.5 mg dose it will have very +ve effect on control of diabetes & also lipid metabolism
& it has been proven to halt progression of diabetes as well.