Synthroid (generic for Levothyroxine) is a prescription medication used to treat hypothyroidism (also known as hypo- or hyperthyroidism) in adults and children age 2 to 17. It is a hormone replacement therapy that replaces thyroid hormones that are usually found in thyroid hormone-free conditions. Synthroid works by replacing or limiting the body’s production of the thyroid hormone thyroid stimulating hormone (H2) or by stimulating the thyroid to produce more thyroid hormone. Synthroid is not approved for use in children under 2 years old.
Take Synthroid exactly as prescribed by your doctor. Your doctor will start you on your typical dose and adjust it based on your medical condition. Synthroid comes in a tablet form. Your dose will depend on your medical condition.
Synthroid works by blocking the action of an enzyme known as cytochrome P450 3A4 (CYP3A4). This prevents the production of the active ingredient T4 (triiodothyronine) by the body. T3, the active hormone, is a byproduct of the body converting T4 to tetraiodothyronine. T4 is essential for the functioning of the thyroid gland and for the development of thyroid hormone. Synthroid blocks the action of this enzyme, which prevents the conversion of tetraiodothyronine to tetraiodopyridinamide (T4) and other byproducts into tetraiodothyronine. T4 is the byproduct of T4 hormone is made by the adrenal gland and converted into tetraiodothyronine through the kidneys.
Synthroid and Levoxyl have the same active ingredient. They contain the same doses of each. The dose of Synthroid usually differs based on your medical condition and response to treatment.
Most people taking Synthroid do not have any side effects. Side effects tend to go away when you stop taking the medication. However, there are some more concerning side effects that can occur. For example, people who are at an increased risk of developing osteoporosis may be more susceptible to osteopenia, a condition in which the bones become lessκ-tripping and lessκ-turing as a result of taking Tydox. Other people may also experience bone pain, swelling, and bruising or bleeding.
It is important to know about all your personal and medical history to help you make an informed decision about whether Synthroid is right for you. If you have any questions about your dosage, treatment, or potential side effects, you should ask your doctor or pharmacist first.
Take Synthroid exactly as prescribed by your doctor has been prescribed by your doctor. Swallow the tablets with a glass of water. Synthroid may be taken with or without food.
If you miss a dose of Synthroid, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one.
Taking more than the prescribed dose of Synthroid can cause serious health issues, including blood clots, stroke, and heart attack. These events are more likely to occur if you take Synthroid more than prescribed.
If you suspect that you have taken too much of Synthroid, call your doctor immediately. Symptoms of overdose include severe fatigue, blood and vomit changes, seizures, and low blood sodium levels. If you suspect that you have taken too much of Synthroid, you may call emergency services.
If you suspect that you have taken too much of Synthroid, dial 911 or the local emergency number. Do not self-treat. If you think you have taken too much of Synthroid, dial 604-898-068 and seek medical attention right away.
Medically reviewed by Jessica Swirble, PharmDLast updated on March 26, 2025
Drug Information| | |
Thyroid medications may be used in the treatment of infertility. It should not be used for the treatment of thyroid cancer.
Thyroid medications are an atypical antipsychotic. It may be used alone or in combination with other medications to treat the symptoms of hypothyroidism. It may be used to reduce the amount of thyroid hormone that your body cannot produce, which is a condition in which your thyroid gland cause excessive thyroid hormone secretion. Thyroid hormone is important for regulating your body's metabolism. Thyroid hormone helps to maintain the balance of thyroid hormones in your body and help to prevent hyperthyroidism (an increase in thyroid hormone production).
Thyroid medications are also used to reduce the symptoms of hypothyroidism. These medications may help to relieve symptoms of hypothyroidism. In some cases, thyroid hormone replacement therapy may be used to treat the symptoms of hypothyroidism or restore thyroid hormone levels. Treatment of symptoms of hyperthyroidism can include the use of thyroid hormone replacement therapy, radioactive iodine therapy,,, and.
Thyroid medications are typically taken orally, usually once a day. In the treatment of thyroid cancer, levothyroxine is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. Levothyroxine is used to reduce symptoms of hypothyroidism. Levothyroxine is available in capsule form and is also sometimes used to treat hyperthyroidism. Capsular control of levothyroxine may be used to improve the effectiveness of levothyroxine.
Common Levothyroxine antidiabetic drugs:
Certain drugs may interact with levothyroxine and may increase the effect of metformin on the thyroid. It is important to tell your doctor about any medications you are taking, including over-the-counter drugs, supplements, and herbal products. Regular medical check-ups with your healthcare provider are essential to determine if you are an appropriate candidate for any antidiabetic drug. You should also speak with your healthcare provider about the risks and benefits of using any antidiabetic drugs before taking any antidiabetic drug.
Certain other medicines may interact with levothyroxine and may affect how well it works. These include:
This does not apply to all medications, including supplements and herbal products. It is important that you talk with your healthcare provider about any other treatments, medications, or medications.
Certain drugs may affect how levothyroxine works in the thyroid.
What is Levothyroxine? Levothyroxine is a synthetic form of the hormone thyroxine. It is produced by the thyroid gland in various parts of the body including the neck, upper and lower the brain, breasts, knees, ankles, and necklaces. Levothyroxine is used to treat hypothyroidism (low thyroid hormone levels) and certain cancers of the thyroid gland. Levothyroxine is also used to treat certain types of autoimmune diseases including Hashimoto’s thyroiditis, thyroiditis, thyroiditis nodularis, and thyroiditis cytolysis.
Levothyroxine is used to reduce the number of thyroid hormone receptors in the pituitary gland. It may also be used to treat symptoms of certain thyroid conditions such as hypothyroidism and certain types of cancer.
Common side effects of Levothyroxine may include:
Before taking Levothyroxine, it is important to inform your doctor of any other medications you are taking. Your doctor may decide to change your dosage or suggest additional treatments. Take Levothyroxine with a meal plan, as it is a low-calorie meal. It is essential to follow the meal plan as some foods and certain beverages can interfere with the absorption of the medication.
If you are not sure about the correct dosage of Levothyroxine, contact your doctor or pharmacist for advice.
It is important to follow your doctor’s instructions and dosage carefully. Do not miss any doses. Take Levothyroxine only when required. Do not increase your dose without the advice of your doctor.
Do not take Levothyroxine on-demand or in the following situations:
Synthroid tablets 100mcg are used to treat hypothyroidism or underactive thyroid, a condition in which the thyroid gland does not make enough thyroid hormone (thyroxine) needed to regulate your body’s growth and metabolism. Hypothyroidism can be idiopathic (of unknown cause) or congenital as in the case of the autoimmune disease Hashimoto's thyroiditis, where the thyroid gland is destroyed by the immune system; it can also be the result of thyroid surgery. Synthroid tablets 100mcg are also used to treat thyroid goitre, which is an enlarged thyroid gland caused by extreme growth of thyroid tissue to compensate for lack of thyroid hormone; also to treat thyroid cancer. Synthroid tablets 100mcg are a replacement hormone to relieve the symptoms of hypothyroidism, including, tiredness, muscle weakness, cramps, feeling the cold, a slow heart rate, dry and flaky skin, hair loss, a deep husky voice and weight gain.
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Proven to be safe and effective in the lay public, with substantial benefits being observed. This is an optional alcoholism medication, intended to provide a support system to help those who may feel empty or inactive due to their drinking behavior. It is not recommended for use in animals.
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