However some contra- indicated medications are diabetes medications, singulair, iron, serotonin, calcium, potassium warfarin. I to take synthroid for 10 years for my hypothyroid.Ask Your Own Medical Question. Can I safely take garcinia cambogia with levothyroxine? I' m pretty healthy exercising, really only need to loose 10lbs give , was doing the low calorie thing , so I recently started to loose weight the right way , take a lb but I didn' t think. There is no known interaction between GARCINIA CAMBOGIA and Synthroid in our records.