Is Indo Metformin-500 Safe For Weight Reduction?

hi i was dignozed with papillary thyroid cancer and is on eltroxin 0.25. it seems that i am showing signs that i am hyperthyroid and have among other things picked up alot of weight in a few months time. a friend recommended that i use indo metformin-500 to help with my weight. how safe is it for me. i am not dibetic