Levothyroxine: breakfast, supplements and consistent dosing
This guide is here to teach you. It is not medical advice, and it does not replace your doctor or pharmacist. Always do what your doctor tells you, and ask a pharmacist before you change how you take any medicine.
Print or save this guideImportant: Thyroid hormone must not be used to treat obesity or for weight loss. Excess doses can cause life-threatening effects. Tablet prescribing information, boxed warning
Quick answers
What does levothyroxine replace?
It replaces thyroid hormone when your body does not make enough. Some people receive it for other thyroid-related treatment plans.
When should I take a tablet?
Standard tablet directions are on an empty stomach, with water, 30–60 minutes before breakfast. Follow the instructions for your exact product.
Can I take it with calcium or iron?
Keep calcium and iron supplements at least four hours away from levothyroxine. Ask about other medicines that may also need spacing.
Sources: MedlinePlus; tablet prescribing information, sections 1, 2 and 7.
Why does the routine matter?
Food and other medicines can affect absorption. Keep your routine consistent and tell your pharmacist about changes to your diet, supplements or product. Do not assume tablet, capsule and liquid directions are interchangeable. MedlinePlus
What if I miss a dose?
Take it when remembered unless it is almost time for the next dose; then skip it. Do not double up unless your prescriber has given you a specific plan. Ask your pharmacist when you are unsure. MedlinePlus
What should I tell my care team?
Share your full medication and supplement list, including antacids and biotin. Biotin can interfere with thyroid blood-test results; ask your clinician when to stop it before testing. Contact your prescriber promptly if you become pregnant, because your dose and monitoring may need adjustment. Do not stop thyroid treatment on your own. Tablet prescribing information, sections 2, 7 and 8
Which symptoms need attention?
Tell your prescriber about a racing heartbeat, shaking, unusual sweating or trouble sleeping. These can occur when the dose is too high. Chest pain, severe breathing trouble or fainting needs emergency care. Keep ordered thyroid blood tests; do not adjust your dose based only on how you feel. MedlinePlus; tablet prescribing information, sections 5, 6 and 17
Build a schedule you can follow
Bring your medicine bottles or a medication list. Ask a Fairview pharmacist to help explain timing, or request a transfer. Prescription services are arranged with the pharmacy; prescriptions are not sold through our OTC shop.
This is general education. Follow your own prescription and care team's instructions.