Skip to main content

How long does Armour Thyroid stay in your system?

Medically reviewed by Sally Chao, MD. Last updated on Aug 22, 2024.

Official Answer by Drugs.com

Armour Thyroid contains two different thyroid hormones derived from pigs, T3 and T4, and T4 will remain in your system longer than T3.

However, these are estimates based on the half-lives of these compounds. The processes involved in absorbing, utilizing and eliminating this combination of thyroid hormones is complex and sensitive, and can be altered by factors including your weight, age, thyroid function, underlying diseases and other medications, such as:

The time it takes to eliminate these hormones can vary depending on these and other factors. For example, thyroid hormones are eliminated more slowly in people with hypothyroidism compared to those with normal thyroid function.

Armour Thyroid also contains other ingredients. Other ingredients include:

Armour Thyroid is mainly excreted through urine.

People who are prescribed Armour Thyroid or the FDA-approved synthetic thyroid hormones, such as levothyroxine, which are absorbed similarly, generally achieve steady levels of the hormone within 6 weeks of starting treatment.

References
  1. Allergan. Armour® Thyroid (thyroid tablets, USP). June 2018. Available at: https://media.allergan.com/actavis/actavis/media/allergan-pdf-documents/product-prescribing/06-2018-Armour-Thyroid-PI-final.pdf. [Accessed August 25, 2021].
  2. Drugs.com. Thyroid, desiccated. October 2020. Available at: https://www.drugs.com/ppa/thyroid-desiccated.html. [Accessed August 25, 2021].
  3. U.S. Food and Drug Administration (FDA). CYTOMEL®. Available at: https://www.accessdata.fda.gov/drugsatfda_docs/label/2002/10379s47lbl.pdf. [Accessed August 19, 2021].
  4. American Thyroid Association (ATA). Hypothyroidism: A Booklet for Patients and Their Families. 2019. Available at: https://www.thyroid.org/wp-content/uploads/patients/brochures/Hypothyroidism_web_booklet.pdf. [Accessed August 19, 2021].
  5. Colucci P, Yue CS, Ducharme M, Benvenga S. A Review of the Pharmacokinetics of Levothyroxine for the Treatment of Hypothyroidism. Eur Endocrinol. 2013;9(1):40-47. doi: 10.17925/EE.2013.09.01.40.
  6. Jonklaas J, Bianco AC, Bauer AJ, et al. Guidelines for the treatment of hypothyroidism: prepared by the american thyroid association task force on thyroid hormone replacement. Thyroid. 2014;24(12):1670-1751. doi: 10.1089/thy.2014.0028.
  7. Drugs.com. Armour Thyroid. May 3, 2021. Available at: https://www.drugs.com/mtm/armour-thyroid.html. [Accessed August 25, 2021].

Related medical questions

Drug information

Related support groups