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Levothyroxine is typically used to treat hypothyroidism, [12] and is the treatment of choice for people with hypothyroidism [13] who often require lifelong thyroid hormone therapy. [14] It may also be used to treat goiter via its ability to lower thyroid-stimulating hormone (TSH), which is considered goiter-inducing.
Blood free thyroxine and TSH levels are monitored to help determine whether the dose is adequate. This is done 4–8 weeks after the start of treatment or a change in levothyroxine dose. Once the adequate replacement dose has been established, the tests can be repeated after 6 and then 12 months, unless there is a change in symptoms. [8]
The dose of liothyronine for hypothyroidism is a lower amount than levothyroxine due it being a higher concentrated synthetic medication. [1] About 25 μg of liothyronine is equivalent to 100 μg of levothyroxine. [2]
Levothyroxine is a frequently prescribed drug in the United States, particularly for older people, as lower thyroid function can be associated with aging. Questions remain over how appropriately ...
When pregnant, a woman with a low-functioning thyroid will also need to increase her dosage of thyroid hormone. [16] One exception is that thyroid hormones may aggravate heart conditions, especially in older patients; therefore, doctors may start these patients on a lower dose and work up to a larger one to avoid risk of heart attack. [17]
Thyroid disease is a medical condition that affects the function of the thyroid gland.The thyroid gland is located at the front of the neck and produces thyroid hormones [1] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ.
Levothyroxine dosing to normalise TSH is based on the amount of residual endogenous thyroid function and the patient’s weight, particularly lean body mass. [15] Usually the dose prescribed ranges from 1.6 mcg/kg to 1.8 mcg/kg, but can be adjusted based upon each patient. [10]
Drug titration is the process of adjusting the dose of a medication for the maximum benefit without adverse effects. [ 1 ] When a drug has a narrow therapeutic index , titration is especially important, because the range between the dose at which a drug is effective and the dose at which side effects occur is small. [ 2 ]
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