Tribulus - Letairis (Ambrisentan) Interaction
Herbal: Tribulus
Also Known As: Tribulus terrestris, Abrojo, Abrojos, Al-Gutub, Baijili, Bindii, Bulgarian Tribulus Terrestris, Caltrop, Cat's-Head, Ci Ji Li, Common Dubbletjie, Croix-de-Malte, Devil's-Thorn, Devil's-Weed, Épine du Diable, Escarbot, Espigón, German Tribulus Terrestris, Goathead, Gokantaka
Drug: Ambrisentan
Brand names:
Letairis, Volibris
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
May 04, 2025
Interaction Details
Ambrisentan is classified as belonging to the following category: Antihypertensive Drugs
Theoretically, taking tribulus with antihypertensive drugs might increase the risk of hypotension.
Animal research shows that tribulus can lower blood pressure by inhibiting angiotensin-converting enzyme (ACE). Tribulus has also demonstrated hypotensive effects in pre-hypertensive adults.
Interaction Rating
Likelihood of Occurrence
PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
References
- Sharifi AM, Darabi R, Akbarloo N. Study of antihypertensive mechanism of Tribulus terrestris in 2K1C hypertensive rats: role of tissue ACE activity. Life Sci 2003;73:2963-71.
- Siddiqui MA, Itrat M, Mobeen A, Khan MI. Efficacy of khar-i-khasak (Tribulus terrestris Linn.) in prehypertension: a randomized, double-blind, placebo-controlled trial. J Complement Integr Med. 2021.
Tribulus Overview
Tribulus is a plant that belongs to the Zygophyllaceae family. It is native to a variety of warm and tropical regions of the world, including Africa, Asia, Europe, and Australia. The plant is known for its spiky, star-shaped flowers and hairy fruit, which contains small, hard seeds.
Tribulus is often utilized as an ingredient in dietary supplements and is one of the most commonly used natural medicines in the world. Its most well-known use is as an aphrodisiac, with a purported ability to improve libido and sexual function. It has also been used to boost athletic performance, and reduce inflammation.
Most often, it is the leaf, fruit, and root of Tribulus that are used as natural medicine. They contain a number of compounds, including protodioscin, which may influence certain hormones, such as testosterone and dehydroepiandrosterone.
Ambrisentan Overview
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Ambrisentan is used alone or in combination with tadalafil (Adcirca, Cialis) to treat pulmonary arterial hypertension (PAH, high blood pressure in the vessels that carry blood to the lungs). Ambrisentan may improve the ability to exercise and slow the worsening of symptoms in people with PAH. Ambrisentan is in a class of medications called endothelin receptor antagonists. It works by stopping the action of endothelin, a natural substance that causes blood vessels to narrow and prevents normal blood flow in people who have PAH.
Tribulus - More Interactions
Tribulus interacts with 254 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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