التداخل بين ليفوثيروكسين وليوثيرونين ونوريثيستيرون

• Thyroxine concentrations may be decreased, due to a decrease in thyroid binding globulin (TBG).

Estrogen, Oral Contraceptives — Estrogens tend to increase serum thyroxine-binding globulin (TBg).

Therefore, patients without a functioning thyroid gland who are on thyroid replacement therapy may need to increase their thyroid dose if estrogens or estrogen-containing oral contraceptives are given.