This probably has never and will never affect anyone.
But I will tell you all anyway, just in case.
I am on 88 MCG of Levothyroxine and am still taking 5 MCG of Cytomel twice a day. I also have been fighting off a cold with a nasty cough, which got so bad a couple of nights ago it woke me up at 4:00AM even though I’m still taking the Ambien. So I resorted to a tried and true remedy: nighttime cough suppressant, cherry flavor. Worked like a charm, except that for the next 24 hours I had a horribly strong metallic taste in my mouth and nothing but time was able to get rid of it. Everything I ate yesterday had no taste at all and cooking/eating it was a waste of time and effort.
It may have been that there was an antihistamine in the cough suppressant, which did not mesh well with either the Levo or the Cytomel.
So, now you have a bit of info, maybe useful, maybe not.
Hugs.
Barbra.