Synthroid

Medically Reviewed by Harshi Dhingra, M.D.

Last Reviewed: Jun 24, 2022

Pros & Cons


What are the pros and cons of Synthroid (levothyroxine)?

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  • Synthroid is safe for use in people of all ages, including infants and children, and during pregnancy.
  • The medication is dosed once a day and is convenient to take.
  • Most of the common side effects of Synthroid are dose-related and go away in a few days.
  • It is an affordable medication with a low-cost generic version available and widespread commercial prescription insurance coverage. 

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  • You need to take Synthroid separately from food and other medications.
  • It can take weeks to months to find the correct dosage.
  • Synthroid can take 6-8 weeks to have a full effect and improve hypothyroidism symptoms. Therefore, do not stop taking the medicine if you don’t notice an improvement in the first few months.
  • Missed doses of this medication can cause symptoms like fatigue, constipation, and dry skin.