They concluded that cholestyramine when compared to methimazole and propranolol, is more effective in decreasing serum levels of thyroid hormones (Table 4) [60]. Another study conducted over a period of 5 weeks in a sample population of 15 patients with thyrotoxicosis observed the effects of cholestyramine, an anion exchange resin that binds iodothyronines, in adjunction with thionamides and atenolol, a beta-blocker. Here, TG is linked to thyrotoxicosis.