Parsley - Acetaminophen, Dextromethorphan Interaction
Herbal: Parsley
Also Known As: Petroselinum crispum, Common Parsley, Garden Parsley, Hamburg Parsley, Parsley Fruit, Parsley Oil, Parsley Seed, Perejil, Persely, Persil, Persil Cultivé, Persil Plat, Persin, Petersylinge, Petroselini Herba, Petrosilini Radix, Prajmoda, Racine de Persil, Rock Parsley
Drug: Acetaminophen, Dextromethorphan
Brand names:
Tylenol Cough Ex Strength
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
May 04, 2025
Interaction Details
Acetaminophen, Dextromethorphan is classified as belonging to the following category: Cytochrome P450 1A2 (Cyp1A2) Substrates
Theoretically, parsley might increase serum levels of CYP1A2 substrates.
Laboratory research suggests that parsley can inhibit CYP1A2.
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
- Peterson, S., Lampe, J. W., Bammler, T. K., Gross-Steinmeyer, K., and Eaton, D. L. Apiaceous vegetable constituents inhibit human cytochrome P-450 1A2 (hCYP1A2) activity and hCYP1A2-mediated mutagenicity of aflatoxin B1. Food Chem.Toxicol. 2006;44(9):147
Parsley Overview
Parsley is a herb that is native to the Mediterranean region and is widely cultivated for its leaves, which are used as a spice in cooking. In traditional medicine, parsley is believed to have a number of health benefits and is often used as a natural diuretic, increasing urine production. This property may make parsley useful in the treatment of certain conditions, such as bloating and water retention. It is also commonly used for gastrointestinal problems.
Parsley - More Interactions
Parsley interacts with 439 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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