hyperthyroidism
2 interactions related to hyperthyroidism
levothyroxine + ashwagandha
Ashwagandha (Withania somnifera) can lower TSH and raise T3 and T4, so it acts on your own thyroid axis on top of the levothyroxine you already take. A randomized trial showed this hormone shift in people with subclinical hypothyroidism, and separate case reports describe ashwagandha-related thyrotoxicosis and painless thyroiditis. Those case reports were not in people taking levothyroxine at the same time, so the additive-overreplacement scenario is plausible but not directly documented.
methimazole + iodine
Methimazole blocks new thyroid hormone synthesis but does not prevent the gland from using iodide already inside it. Adding a large iodine load (kelp, iodine drops, iodine-containing contrast, amiodarone) can fuel hormone production, blunt methimazole's effect, and in some people worsen hyperthyroidism or, rarely, precipitate thyroid storm.