Synthroid- Since thyroid hormone occurs naturally in the body, almost anyone can take
levothyroxine. You should not use this medication if you have had a heart attack, a thyroid
disorder called thyrotoxicosis, or an adrenal gland problem that is not controlled by treatment.
Before taking this medication, tell your doctor if you have heart disease, coronary artery
disease, anemia (lack of red blood cells), diabetes, problems with your pituitary or adrenal
glands, or a history of blood clots.
If you use insulin or take diabetes medicine by mouth, ask your doctor if your dose needs
to be changed when you start using levothyroxine.
Different brands of levothyroxine may not work the same. If you get a prescription
refill and your new pills look different, talk with your pharmacist or doctor.
It may take several weeks before your body starts to respond to this medication. Do not
stop taking this medication suddenly. Even if you feel well, you may still need to take this
medicine every day for the rest of your life to replace the thyroid hormone your body cannot
produce.
There are many other medicines that can affect levothyroxine. Tell
your doctor about all the prescription and over-the-counter medications you use. This includes
vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a
new medication without telling your doctor.