It rather depends on whether you have type 1 or type 2 diabetes and whether there are any life style changes you can make.
If you are overweight getting down to a normal weight can help. I had a very overweight friend who lost 8 stone and was able to stop all medication and just keep an eye on his diet, no eating packets of biscuits or drinking heavily. If you have a sweet tooth, curbing that can help.
But, if like another friend, you are wafer thin, have a good balanced diet and keep active and still need medication for your diabetes, then, no, there may not be much you can do to come off your medication.