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 thatвЂ™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 thatвЂ™s recently diagnosed.

Dosage for newly diagnosed primary hypothyroidism in adults There isnвЂ™t a maximum dosage, but needing to take more than 300 mcg per day may suggest that Synthroid isnвЂ™t effective for treating your condition. Note: For treating hypothyroidism, a Synthroid dosage thatвЂ™s higher than 200 mcg in 24 hours is typically considered high. See вЂњWhatвЂ™s the dosage of Synthroid for children?вЂќ below for a pediatric dosage chart. For this use, recommended dosages vary based on the childвЂ™s age and weight. Synthroid is also approved to treat hypothyroidism in children. Primary hypothyroidism thatвЂ™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 youвЂ™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 вЂњWhat factors can affect my dosage?вЂќ section below. This may also be done to reduce any side effects youвЂ™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 thatвЂ™s taken by mouth. Below are details about SynthroidвЂ™s form, strengths, and typical dosages.

0.05 mg to mcg