That’s not a silly question at all - and no it definitely does not break fasting (although some medications need to be taken with food - it generally says on the directions where this is the case) – levothyroxine has minimal to zero calorific content- it definitely doesn’t break your fast
Not dumb at all. Actually I figured the lactose, with wich a lot of medicine is partitioned, is literally one of the sugars we want to avoid at certain times when IF. Sugar coatings too so yes there are some medications that can interfiere with the model of IF