What you should know about SYNTHROID:
SYNTHROID contains a synthetic thyroid hormone that is identical to one of the hormones, T4, produced by the thyroid gland. SYNTHROID is prescribed to replace a hormone that is not being produced in sufficient quantities by your thyroid gland. This condition is called hypothyroidism.
SYNTHROID is also used to treat benign thyroid nodules and in conjunction with surgery and radioactive iodine therapy in the management of certain types of thyroid cancer.
SYNTHROID is available in tablet form, in 12 different strengths. Your doctor will prescribe the strength that's right for you.
If you've been taking SYNTHROID (even starter samples from your doctor) be sure you get the same brand and dose every time. If there is a change of brand or dose, consult your doctor. Your doctor has tested and adjusted your medication precisely to your needs - do not change to another product or another dose without discussing that change with your doctor first. Repeat blood tests and a change in the amount of levothyroxine you take may be required.
Notify your doctor if you are allergic to any foods or medicines, are pregnant or intend to become pregnant, are breast-feeding or are taking any other medications, including prescription and over-the-counter preparations.
Notify your doctor of any other medical conditions you may have, particularly heart disease, diabetes, clotting disorders, and adrenal or pituitary gland problems. Your dose of medications used to control these other conditions may need to be adjusted while you are taking SYNTHROID. If you have diabetes, monitor your blood and/or urinary glucose levels as directed by your physician and immediately report any changes to your physician. If you are taking anticoagulants (blood thinners), your clotting status should be checked frequently.
Use SYNTHROID only as prescribed by your physician. Do not discontinue or change the amount you take or how often you take it, unless directed to do so by your doctor.
The levothyroxine in SYNTHROID is intended to replace a hormone that is normally produced by your thyroid gland. Generally, replacement therapy is to be taken for life, except in cases of transient hypothyroidism, which is usually associated with an inflammation of the thyroid gland (thyroiditis).
Take SYNTHROID as a single dose, preferably on an empty stomach, one-half to one hour before breakfast. Levothyroxine absorption is increased on an empty stomach.
It may take several weeks before you notice an improvement in your symptoms.
Notify your physician if you experience any of the following symptoms: rapid or irregular heartbeat, chest pain, shortness of breath, leg cramps, headache, nervousness, irritability, sleeplessness, tremors, change in appetite, weight gain or loss, vomiting, diarrhea, excessive sweating, heat intolerance, fever, changes in menstrual periods, hives or skin rash, or any other unusual medical event.
Notify your physician if you become pregnant while taking SYNTHROID. It is likely that your dose of SYNTHROID will need to be increased while you are pregnant.
Notify your physician or dentist that you are taking SYNTHROID prior to any surgery.
Partial hair loss may occur rarely during the first few months of SYNTHROID therapy, but this is usually temporary.
SYNTHROID should not be used as a primary or adjunctive therapy in a weight control program.
Keep SYNTHROID out of the reach of children. Store SYNTHROID away from heat, moisture, and light.
Adverse events with SYNTHROID other than those related to hyperthyroidism as a result of therapeutic overdosage are rare; however, if you experience any unusual symptoms, you should consult with your healthcare provider
Here is a little bit about it.