Compare Synthroid vs. Thyrolar

Head-to-head comparisons of medication uses, side effects, ratings, and more.

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Replaces thyroid hormones.

Synthroid (levothyroxine) effectively replaces thyroid hormone when your body is not making enough, but it's important to take it exactly as instructed since it's affected by other medicines or supplements.

4.1/ 5 average rating with 1090 reviewsforSynthroid
No information currently available
Upsides
  • Works well to improve symptoms of an underactive thyroid by supplying thyroid hormone.
  • Unlike some alternative supplements, Synthroid (levothyroxine) is safe to use for any age range and during pregnancy.
  • Compared to some alternative thyroid supplements, Synthroid (levothyroxine) provides a consistent amount of thyroid hormone per pill. Inconsistent amounts can be dangerous.
  • Generic versions are available.
  • Only need to take once a day.
No information currently available
Downsides
  • Synthroid (levothyroxine) must be taken a specific way, separated from some other medicines.
  • Synthroid (levothyroxine) is only T4 thyroid hormone, which is less active than T3 hormone. It may not work for everyone.
  • Initially, your dose may be changing, until you get to the right dose that supplies the right amount of thyroid hormone.
  • Routine blood tests are needed periodically.
  • It can take 6 to 8 weeks to see the full effects.
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Used for
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Dosage forms
  • Pill
  • Pill
Price
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Reviews
1090 reviews so far
75%
saidit'sworth it
62%
saiditworked well
10%
saidit'sa big hassle

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Side effects
The Synthroid (levothyroxine) FDA package insert doesn’t have numbers about how common side effects are.
The Thyrolar (Liothyronine / Levothyroxine) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Weight reduction
    • Taking other medicines for weight loss
  • Heart problems
    • Current heart disease
    • Age 65 or older
    • Taking Synthroid (levothyroxine) with certain types of stimulant medicines
  • Diabetes control
  • Achieving desired thyroid levels
  • Bone effects
    • Duration of treatment
    • Postmenopausal women
  • Adrenal crisis
    • Adrenal insufficiency
See more detailed risks and warnings
No information currently available