Hi i take thyroxine, i had bypass and was able to take the thyroxine tablets as normal 3 days after op as they are tiny tablets. You asked to take multivitamin for life after the op, i had to restart taking my multi vitamins 2 weeks after the op, broke them in two and they are fine. I ould advise you to speak to the bariatric team with regards to your tablets as it appears that every team is different in how they work.Hope this helps. xxx