Comfrey - Rylaze (Asparaginase Erwinia Chrysanthemi (Recombinant)-Rywn) Interaction
Herbal: Comfrey
Also Known As: Symphytum officinale, Ass Ear, Beinwellwurzel, Black Root, Blackwort, Bruisewort, Common Comfrey, Consolidae Radix, Consoude, Consoude Officinale, Consound, Consuelda, Grande Consoude, Gum Plant, Healing Herb, Herbe aux Charpentiers, Herbe à la Coupure, Knitback
Drug: Asparaginase Erwinia Chrysanthemi (Recombinant)-Rywn
Brand names:
Rylaze

Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
May 04, 2025
Interaction Details
Asparaginase Erwinia Chrysanthemi (Recombinant)-Rywn is classified as belonging to the following category: Hepatotoxic Drugs
Theoretically, comfrey might have additive adverse effects on the liver when used with hepatotoxic drugs.
Due to its pyrrolizidine alkaloid constituents, comfrey can cause hepatotoxic effects, including ascites, cirrhosis, hepatic fibrosis, hepatomegaly, and sinusoidal obstruction syndrome.
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
- Food and Drug Administration. FDA Advises Dietary Supplement Manufacturers to Remove Comfrey Products From the Market. July 6, 2001. Available at: http://www.cfsan.fda.gov/~dms/dspltr06.html.
- Stickel F, Seitz HK. The efficacy and safety of comfrey. Public Health Nutr 2000;3:501-8.
Comfrey Overview

Asparaginase Erwinia Chrysanthemi (Recombinant)-Rywn Overview
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Asparaginase erwinia chrysanthemi (recombinant)-rywn injection is used with other chemotherapy medications to treat acute lymphocytic leukemia (ALL; a type of cancer of the white blood cells) and to treat a type of non-Hodgkins lymphoma (NHL: cancer that begins in a type of white blood cell that normally fights infection) in adults and children 1 month of age and older. It is used in people who have had some types of allergic reactions to medications similar to asparaginase erwinia chrysanthemi (recombinant)-rywn such as asparaginase (Elspar). Asparaginase erwinia chrysanthemi (recombinant)-rywn is an enzyme that interferes with natural substances necessary for cancer cell growth. It works by killing or stopping the growth of cancer cells.
Comfrey - More Interactions
Comfrey interacts with 410 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.