Coltsfoot - Symfi (Efavirenz, Lamivudine, Tenofovir Disoproxil Fumarate) Interaction
Herbal: Coltsfoot
Also Known As: Tussilago farfara, Ass's Foot, Brandlattich, British Tobacco, Bullsfoot, Colt's Foot, Coughwort, Farfarae Flos, Fieldhove, Flower Velure, Foal's Foot, Foalswort, Guflatich, Hallfoot, Horsefoot, Horsehoof, Pas Diane, Plisson, Taconnet, Tussilage
Drug: Efavirenz, Lamivudine, Tenofovir Disoproxil Fumarate
Brand names:
Symfi
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Jul 22, 2023
Interaction Details
Efavirenz, Lamivudine, Tenofovir Disoproxil Fumarate is classified as belonging to the following category: Cytochrome P450 3A4 (Cyp3A4) Inducers
Hepatotoxic pyrrolizidine alkaloids (PA) are substrates of cytochrome P450 3A4 (CYP3A4). Theoretically, drugs that induce CYP3A4 might increase the conversion of PAs to toxic metabolites. Some drugs that induce CYP3A4 include carbamazepine (Tegretol), phenobarbital, phenytoin (Dilantin), rifampin, rifabutin (Mycobutin), and others.
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
- Chojkier M. Hepatic sinusoidal-obstruction syndrome: toxicity of pyrrolizidine alkaloids. J Hepatol 2003;39:437-46.
- Wang YP, Yan J, Fu PP, Chou MW. Human liver microsomal reduction of pyrrolizidine alkaloid N-oxides to form the corresponding carcinogenic parent alkaloid. Toxicol Lett 2005;155:411-20.
Coltsfoot Overview
Coltsfoot (Tussilago farfara) is a perennial herb native to Europe and Asia and named for its leaves, which resemble the shape of a calf's foot. It has round, bright yellow flowers which resemble small dandelions, although it is not related to them.
Coltsfoot has been used in traditional medicine for centuries for its purported expectorant and anti-inflammatory effects, which may help to loosen mucus and ease breathing.
It is important to note that Coltsfoot may contain liver-toxic pyrrolizidine alkaloids. Repeated exposure could potentially cause harm. It is important to only utilize dietary supplements that have removed these harmful compounds.
Efavirenz, Lamivudine, Tenofovir Disoproxil Fumarate Overview
-
The combination of efavirenz, lamivudine, and tenofovir is used to treat HIV in adults and children. Efavirenz is in a class of medications called non-nucleoside reverse transcriptase inhibitors (NNRTIs). Lamivudine and tenofovir are in a class of medications called nucleoside and nucleotide reverse transcriptase inhibitors (NRTIs). They work by decreasing the amount of HIV in the body. Although efavirenz, lamivudine and tenofovir will not cure HIV, these medications may decrease your chance of developing acquired immunodeficiency syndrome (AIDS) and HIV-related illnesses such as serious infections or cancer. Taking these medications along with practicing safer sex and making other lifestyle changes may decrease the risk of getting or transmitting the HIV virus to other people.
Coltsfoot - More Interactions
Coltsfoot interacts with 366 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. |
Return to the main herbal interaction checker page
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.
Ask A Pharmacist About Your Herbal Questions!
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!
Ask A Pharmacist