I Was Told By My Doctor I Could Take Slow

I was told by my doctor i could take slow fe for my anemia i couldnt find it and was gonna take a iron supplement instead with vitamin c which doc recommended and it made me sick so not taking anything i found the slowfe and i wanna take it but i noticed it says if on levothyroxine to monitor and i am on levothyroxin 125mcg but my doctor said to take it is it ok to take?