Dosage for secondary or tertiary hypothyroidism in adults Your doctor may adjust your dosage every 2 to 4 weeks as needed during treatment. The typical starting dosage for this use in adults is 12.5 mcg to 25 mcg, once per day. Synthroid is approved to treat primary hypothyroidism that’s severe and longstanding. Dosage for severe, longstanding primary hypothyroidism in adults Your doctor may adjust your dosage every 4 to 6 weeks as needed during treatment. For example, an adult weighing 68 kg (about 150 lb) may take 100 mcg to 112 mcg of Synthroid per day as their starting dosage. One kilogram is equal to about 2.2 pounds (lb). The typical starting dosage for this use in adults is 1.6 micrograms per kilogram of body weight (mcg/kg), once per day. Synthroid is approved to treat primary hypothyroidism that’s recently diagnosed. Dosage for newly diagnosed primary hypothyroidism in adults There isn’t a maximum dosage, but needing to take more than 300 mcg per day may suggest that Synthroid isn’t effective for treating your condition. Note: For treating hypothyroidism, a Synthroid dosage that’s higher than 200 mcg in 24 hours is typically considered high. See “What’s the dosage of Synthroid for children?” below for a pediatric dosage chart. For this use, recommended dosages vary based on the child’s age and weight. Synthroid is also approved to treat hypothyroidism in children. Primary hypothyroidism that’s severe and longstanding Recommended Synthroid starting dosage in adults For more detailed information about each dosage, see the sections below. These dosages are based on condition and body weight, which is given as micrograms per kilogram (mcg/kg). The dosage chart below provides an overview of Synthroid dosage recommendations for adults. The recommended Synthroid dosage for treating hypothyroidism depends on the cause of your hypothyroidism and how long since you’ve been diagnosed with the condition. Your doctor will determine the best dosage to fit your needs. However, be sure to take the dosage your doctor prescribes for you. The information below describes common dosages that are typically used or recommended. See the “What factors can affect my dosage?” section below. This may also be done to reduce any side effects you’re having. Your dosage may be changed to make sure the drug is helping you meet your thyroid-stimulating hormone (TSH) treatment goals. Your doctor will ultimately prescribe the smallest dosage that provides the desired effect. Then they may adjust your dosage as needed during treatment, by amounts of 12.5 mcg to 25 mcg. Typically, your doctor will start you on a low dosage level. What are the typical dosages of Synthroid? One milligram is equal to 1,000 micrograms. Note: Synthroid comes in micrograms rather than milligrams (mg). The following strengths are also available: Synthroid is available in 25-microgram (mcg) strength intervals, as follows: 25 mcg, 50 mcg, 75 mcg, 100 mcg, 125 mcg, 150 mcg, 175 mcg, and 200 mcg. The tablets come in different colors depending on which strength they are.
Synthroid comes as a tablet that’s taken by mouth. Below are details about Synthroid’s form, strengths, and typical dosages.
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