I was on victoza for 18 mths and it was fantastic for prob the first 12 mths, then although i was still getting HBA1c of around 5.5 the weight was coming back on and i was constipated all the time, i am now back on metofrmin and gliclazide and although my numbers are not as low i feel better at the moment for being off it. I must say though that the drug did keep my blood sugar level but my doc thought that cos my level was always between 4-5 it was a little bit too low but once i stopped it my bs shot back up to 14 - 17 after meals as tried a week break with no meds !