question: Which drugs may interfere thyroxine absorption?
answer: bile acid sequestrants, ferrous sulphate, sucralfate, calcium carbonate, aluminium-containing antacids, phosphate binders, raloxifene and proton-pump inhibitors, have also been shown to interfere with the absorption of levothyroxine
  sevelamer hydrochloride or chromium picolinate should be advised to separate the time of ingestion of these drugs from their thyroid hormone preparation by several hours