What Are The Side Effects If Glyciphage Is Not Taken?

Is there any side effects if I stop taking Glyciphage in between? I men I have taken these tablets for 3 months but unfortunately by stomatch get upset so badly due to which I have stopped taking these drugs. So just want to kn/ow that do I have to start again or leave it as it is? Please advice About me: I am 33 years old suffering from PCOD. My weight is 85.5 Kg. My gyne assist me to have glyciphage to reduce weight .