I've recently been put on a brand (first time ever, I'm 66) for hypothyroid (which I think I've had for decades) - 25mg. By mid morning I felt nauseous, which stayed all day. I didn't want lunch (unheard of), though I was able to eat it. Then, in the early evening I also started getting tummy/lower pains that went on for hours, like the waves you get when you've eaten something a bit bad, and the signs that 'diarrhea' is on its way.
The following morning I woke with a racing pulse - I don't know how long it lasted, but hours, then I just forgot about it. But I did decide, because of this, not to take a second tablet. The nausea had gone, but the uncomfortable gut feelings, and now distended abdomen/bloating, were still there.
The third day I thought I must persist with the tablets, so I took a second pill. But the nausea came back exactly the same, mid morning and underlying all day, and the bloating evident.
So today I have not had a third tablet. I rang the pharmacist, who said they'd never heard of this being a side effect of Teva Levothyroxine or any brand - and that it might be this occurs with all the brands. And this evening, still feeling queasy and bloated, diarrhea episode.
Before I go back to the doctor (a week away first poss.appointment) - I'd be grateful for your experience and knowledge. Many thanks.