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Renthyroid

Generic: Levothyroxine And Liothyronine

Rx only
Thyroid hormone✓ FDA-verified
View full FDA label ↗
Renthyroid is a medication used to treat hypothyroidism, which is a condition where the thyroid gland doesn't produce enough hormones. It works by providing the body with the thyroid hormones it needs to regulate metabolism and energy levels. You take it as a tablet, starting with a dose of 30 mg, which can be increased by 15 mg every 2 to 3 weeks, with most people needing between 60 to 120 mg per day. It's important to know that this medication should not be used by people with untreated thyroid overactivity or adrenal problems. Additionally, if you are taking biotin supplements, you should stop them at least two days before having your thyroid hormone levels tested, as they can interfere with the results.
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Uses

  • Hypothyroidism of any cause.
  • Cretinism.
  • Myxedema.
  • Thyroid nodules.
  • Hashimoto's thyroiditis.
  • Multinodular goiter.
  • Thyroid cancer.
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Dosage

Starting dose is usually 30 mg, increasing by 15 mg every 2 to 3 weeks.
Most patients require 60 to 120 mg daily.
Pediatric doses vary by age, starting from 15 mg for infants.
Adjustments may be needed based on lab results.
Always follow your doctor's specific instructions for your dose.
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Side effects

Common

Possible symptoms include increased heart rate and anxiety

Serious

Rare adverse reactions aside from hyperthyroidism symptoms
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Warnings

⚠ Important warnings

  • Not for weight loss; ineffective and can be dangerous.
  • Not for infertility unless hypothyroidism is present.
  • Monitor closely if taking anticoagulants or diabetes medications.
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Drug interactions

  • Oral Anticoagulantsmay require dosage adjustmentsCaution
  • Insulin or Oral Hypoglycemicsmay increase dosage needsCaution
  • Cholestyramine or Colestipolimpairs absorption of thyroid hormonesCaution
  • Estrogen, Oral Contraceptivesmay increase thyroid hormone requirements.Caution

Ask about this drug

Answers pulled from the FDA label only.

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Medical Disclaimer: This content is provided for informational and educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before taking any medication.
Data Source: Publicly available drug labeling information from the U.S. Food and Drug Administration (FDA).