Ethynodiol diacetate and ethinyl estradiol and Liothyronine interaction
Ethynodiol diacetate and ethinyl estradiol and Liothyronine: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Liothyronine (Liothyronine Sodium) label · effective 2026-06-04
Table 2: Drugs That May Alter Triiodothyronine (T3) Serum Transport Without Affecting Free Thyroxine (FT4) Concentration (Euthyroidism) Drug or Drug Class Effect Clofibrate Estrogen-containing oral contraceptives Estrogens (oral) Heroin/Methadone 5-Fluorouracil Mitotane Tamoxifen These drugs may increase serum thyroxine-binding globulin (TBG) concentration.
Pregnancy, infectious hepatitis, estrogens, estrogen-containing oral contraceptives, and acute intermittent porphyria increase TBG concentrations.
From the Ethynodiol diacetate and ethinyl estradiol (Kelnor 1/35) label · effective 2023-02-04
…and blood components may be affected by oral contraceptives: a) Increased prothrombin and factors VII, VIII, IX and X; decreased antithrombin III; increased platelet aggregability. b) Increased thyroid binding globulin (TBG), leading to increased circulating total thyroid hormone as measured by protein-bound iodine (PBI), T 4 by column or by radioimmunoassay.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.