The drug does this by suppressing (decreasing) levels of thyroid stimulating hormone (TSH).įor this use, a Synthroid dosage of 2 mcg/kg is usually needed. Synthroid is approved to treat a type of thyroid cancer. See the “Factors affecting your dosage” section below for more information. Your doctor may then adjust your dosage based on your thyroid hormone levels, as well as other factors. When used to treat hypothyroidism that’s severe and long term, Synthroid’s recommended starting dosage is 12.5 mcg to 25 mcg, once per day. Your doctor will prescribe the closest available strength of Synthroid tablets.ĭosage for long-term, severe hypothyroidism For example, if you weigh 80 kg (about 176 lb), your starting Synthroid dosage would be 125 mcg daily. One kilogram is equal to about 2.2 pounds (lb). Your doctor may adjust your dosage during treatment if needed. Dosage for hypothyroidism in adultsįor treating hypothyroidism, Synthroid dosages can differ depending on whether it’s used for hypothyroidism that’s newly diagnosed, or for hypothyroidism that’s severe and long term.ĭosage for hypothyroidism that’s newly diagnosedįor treating hypothyroidism that’s been diagnosed within the past few months, the typical starting Synthroid dosage is 1.6 mcg/kg, once per day. Your doctor will determine the best dosage to fit your needs. But be sure to take the dosage your doctor prescribes for you. The following information describes dosages that are commonly used or recommended. Since this dosage varies based on body weight, your “normal” dosage may be different from other people’s dosages. Your doctor will ultimately prescribe the smallest dosage that provides the desired effect.įor example, the average dosage of Synthroid for treating hypothyroidism is 1.6 mcg of drug per kilogram (mcg/kg) of body weight, once per day. Then they’ll adjust it over time to reach the amount that’s right for you. Typically, your doctor will start you on a low dosage. The dosage range for Synthroid depends on the condition you’re taking the drug to treat and how effective the drug is for you. This is different from most other medications, which are typically dosed in milligrams (mg). It’s important to note that Synthroid is dosed in micrograms. It comes in the following strengths: 25 micrograms (mcg), 50 mcg, 75 mcg, 88 mcg, 100 mcg, 112 mcg, 125 mcg, 137 mcg, 150 mcg, 175 mcg, 200 mcg, and 300 mcg. Synthroid comes as tablets that you swallow. Below is important information about Synthroid dosage for these uses. Synthroid is approved to treat hypothyroidism and a type of thyroid cancer.
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