Theanine - Lenvima (Lenvatinib) Interaction
Herbal: Theanine
Drug: Lenvatinib
Brand names:
Lenvima
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Jun 22, 2025
Interaction Details
There were no interactions found between Lenvatinib and Theanine. 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.
Theanine Overview
Theanine, often referred to as L-theanine as that is the predominant isomer of theanine, is an amino acid commonly found in tea leaves, particularly in green tea. It is purported to increase levels of GABA, serotonin, and dopamine in the brain, which can help to reduce stress and anxiety. L-theanine may also promote a sense of calm and improve overall well-being. Some studies have also suggested that it may improve cognitive function, although more research is needed. Most reported drug interactions with theanine are due to its sedative effects.
Lenvatinib Overview
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Lenvatinib is used to treat a certain type of thyroid cancer that has returned or that has spread to other parts of the body and cannot be treated with radioactive iodine. Lenvatinib is also used along with everolimus (Afinitor, Zortress) to treat renal cell carcinoma (RCC, a type of cancer that begins in the kidney) in people who have previously received treatment with another chemotherapy medication. Lenvatinib is also used along with pembrolizumab (Keytruda) as an initial treatment for advanced renal cell carcinoma. Lenvatinib is also used to treat hepatocellular carcinoma (HCC; a type of liver cancer) that cannot be treated with surgery. Lenvatinib is also used along with pembrolizumab (Keytruda) to treat a certain type of cancer of the endometrium (lining of the uterus) that has spread to other parts of the body or worsened during or after treatment with chemotherapy medications or that cannot be treated with surgery or radiation therapy. Lenvatinib is in a class of medications called kinase inhibitors. It works by blocking the action of an abnormal protein that signals cancer cells to multiply. This helps stop the spread of cancer cells.
Theanine - More Interactions
Theanine interacts with 558 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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Dr. Brian Staiger, PharmD
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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