American Mistletoe - Telmisartan Interaction
Herbal: American Mistletoe
Also Known As: Phoradendron leucarpum, Eastern Mistletoe
Drug: Telmisartan
Brand names:
Micardis
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Feb 06, 2024
Interaction Details
Telmisartan is classified as belonging to the following category: Antihypertensive Drugs
American mistletoe contains phoratoxin, a compound toxic to humans that induces smooth muscle contraction and vasoconstriction, potentially increasing blood pressure and heart rate. Case reports of cardiotoxicity have been documented with American mistletoe, and it should not be used with antihypertensive drugs or by individuals with cardiac conditions. American mistletoe is uncommon in dietary supplements, and formulations containing it are generally homeopathic. European mistletoe, which lacks phoratoxin, is more commonly used.
Interaction Rating
Likelihood of Occurrence
ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
American Mistletoe Overview
American mistletoe, scientifically known as Phoradendron leucarpum, is a parasitic plant found in the eastern United States and Mexico. It grows on hardwood trees like oaks and hickories. Although it has been used in traditional Native American medicine, there isn't strong scientific evidence for its effectiveness.
American mistletoe contains phoratoxin, a compound that can be toxic. This toxin induces smooth muscle contraction, leading to increased uterine and intestinal motility, which can result in gastrointestinal symptoms. Additionally, it can cause vasoconstriction, leading to changes in blood pressure and heart rate, similar to the effects of cardiotoxins found in cobra venom.
Most case reports documenting ingestion suggest that eating up to 20 berries or 5 leaves is unlikely to cause serious harm, but there are reports of fatalities from cardiovascular collapse after drinking tea made from an unspecified amount of berries.
It's important to note that American mistletoe is different from European mistletoe, which is more commonly used in dietary supplements.
Telmisartan Overview
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Telmisartan is used alone or in combination with other medications to treat high blood pressure. Telmisartan is also used to decrease the chance of heart attack, stroke, or death in people 55 years of age or older who are at high risk for cardiovascular disease. Telmisartan is in a class of medications called angiotensin II receptor antagonists. It works by blocking the action of certain natural substances that tighten the blood vessels, allowing the blood to flow more smoothly and the heart to pump more efficiently.
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High blood pressure is a common condition and when not treated, can cause damage to the brain, heart, blood vessels, kidneys and other parts of the body. Damage to these organs may cause heart disease, a heart attack, heart failure, stroke, kidney failure, loss of vision, and other problems. In addition to taking medication, making lifestyle changes will also help to control your blood pressure. These changes include eating a diet that is low in fat and salt, maintaining a healthy weight, exercising at least 30 minutes most days, not smoking, and using alcohol in moderation.
American Mistletoe - More Interactions
American Mistletoe interacts with 187 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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