How common is it for people taking too much thyroid medication (i.e. medication-induced hyperthyroidism) to gain weight? I have no idea whether I am over- or under-medicated at the moment but have gained weight and can't shift it; my last results were TSH -0.01 (0.3-5.0), fT4 15.9 (10-19.8); I'm still waiting for the fT3 result. My heart rate is not too fast, no palpitations, temperature's fine.
I currently take 150mcg T4 and 5mcg T3; in June my bloods whilst on 150mcg T4 and 6.25mcg T3 were TSH 0.03, fT4 18.9, fT3 4.5. Same ranges as before.