Short version: calcium inhibits levothyroxine absorption, so one oughtn't to take it within 4 hours of taking the thyroxine, because that way your thyroxine dose has a chance to get properly digested. Mayo Clinic; a miscellaneous academic paper; BNF.
(Note that iron is also In Theory supposed to be taken with a significant buffer between it & thyroxine -- HOWEVER GIVEN that you're stable with your current dose regime it is Probably Wise to Not Alter That & also to flag it up to whoever's in charge of your endocrine care at the moment.)
I'm increasingly contemplating solving this problem by taking thyroxine at night, instead; I *try* to have dinner early enough that it ought to be fine if I take it last thing, given that that seems to work just fine...
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regna
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Date: 2019-01-30 05:56 pm (UTC)(Note that iron is also In Theory supposed to be taken with a significant buffer between it & thyroxine -- HOWEVER GIVEN that you're stable with your current dose regime it is Probably Wise to Not Alter That & also to flag it up to whoever's in charge of your endocrine care at the moment.)
I'm increasingly contemplating solving this problem by taking thyroxine at night, instead; I *try* to have dinner early enough that it ought to be fine if I take it last thing, given that that seems to work just fine...