It WAS overactive but thanks to radioactive Iodine it's now underactive .  I'm on the same med . I was told to take it at least 3 hrs. apart from my other meds or food so I take it 1st thing and take my other meds at work at break time when I eat . 
 Yeah I don't recommend getting old !!  Not much in the way of options though .  

  I can't wait to be able to retire !