Ergot - Cytomel (Liothyronine) Interaction
Herbal: Ergot
Also Known As: Claviceps purpurea, Cockspur Rye, Cornezuelo, Ergot de Seigle, Hornseed, Mai Jiao, Mother of Rye, Secale Cornutum, Smut Rye, Spurred Rye
Drug: Liothyronine
Brand names:
Cytomel
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Jun 22, 2025
Interaction Details
There were no interactions found between Liothyronine and Ergot. This does not mean the potential for an interaction does not exist, however. There is often a lack of studies and data surrounding traditional medicine, especially concerning drug interactions, so it is important to always consult your provider before making any changes to your medication regimen.
Ergot Overview
Ergot is a fungal plant infection that most commonly grows on rye. Ergot contains ergolines, which are alkaloids that have various pharmacologic and toxic effects. A well-known illness from the Middle Ages, St. Anthony's Fire, was brought on by the widespread consumption of fungus-contaminated rye grain which caused ergot poisoning (ergotism). Ergot has been used medicinally for obstetric and gynecologic conditions, such as abnormally heavy bleeding at menstruation since ergot contains chemicals that can help reduce bleeding by causing a narrowing of the blood vessels. Due to the safety concerns of consuming ergot, its use is not recommended.
Liothyronine Overview
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Liothyronine is used to treat hypothyroidism (a condition where the thyroid gland does not produce enough thyroid hormone). Liothyronine is also used to treat a goiter (an enlarged thyroid gland) and to test for hyperthyroidism (a condition where the thyroid gland produces too much thyroid hormone). Liothyronine is in a class of medications called thyroid agents. It works by supplying the thyroid hormones normally produced by the body.
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Currently, there is not enough evidence from clinical studies to support the use of liothyronine, alone or in combination with other medications, as the first choice of therapy to treat hypothyroidism.
Ergot - More Interactions
Ergot interacts with 453 drugs
Interaction Rating Key
These severity listings are for informational use only. Never start, stop or otherwise change your therapy before speaking with your provider.
| Major | The combined use of these agents is strongly discouraged as serious side effects or other negative outcomes could occur. |
| Moderate | Use cautiously under the care of a healthcare professional or avoid this combination. A significant interaction or negative outcome could occur. |
| Minor | Be aware that there is a chance of an interaction. Watch for warning signs of a potential interaction. |
| Unknown | No interactions have been reported or no interaction data is currently available. |
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Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
© 2021 Therapeutic Research Center, LLC
Drug descriptions are provided by MedlinePlus.
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In addition to being a clinical pharmacist specializing in pharmacotherapy, Dr. Brian Staiger is a registered herbalist through the American Herbalist Guild. He has combined his passion for pharmacy practice with the study of medical ethnobotany to improve patient care. Feel free to reach out about any of your herbal or medication questions!
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