Chaparral - Actemra (Tocilizumab) Interaction
Herbal: Chaparral
Also Known As: Larrea divaricata, Creosote Bush, Créosotier, Greasewood, Hediondilla, Jarilla, Larreastat
Drug: Tocilizumab
Brand names:
Actemra

Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
May 11, 2025
Interaction Details
Tocilizumab is classified as belonging to the following category: Hepatotoxic Drugs
Theoretically, chaparral might have additive adverse effects on the liver when used with hepatotoxic drugs.
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
- Smith BC, Desmond PV. Acute hepatitis induced by ingestion of the herbal medication chaparral. Aust N Z J Med 1993;23:526..
- Gordon DW, Rosenthal G, Hart J, et al. Chaparral ingestion: the broadening spectrum of liver injury caused by herbal medications. JAMA 1995;273:489-90.
- Batchelor WB, Heathcote J, Wanless IR. Chaparral-induced hepatic injury. Am J Gastroenterol 1995;90:831-3.
- Katz M, Saibil F. Herbal hepatitis: subacute hepatic necrosis secondary to chaparral leaf. J Clin Gastroenterol 1990;12:203-6.
- Sheikh NM, Philen RM, Love LA. Chaparral-associated hepatotoxicity. Arch Intern Med 1997;157:913-9.
- Chaparral-induced toxic hepatitis-California and Texas, 1992. MMWR Morb Mortal Wkly Rep 1992;41:812-4..
- Estes JD, Stolpman D, Olyaei A, et al. High prevalence of potentially hepatotoxic herbal supplement use in patients with fulminant hepatic failure. Arch Surg 2003;138:852-8..
Chaparral Overview

Tocilizumab Overview
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Tocilizumab injection is used alone or in combination with other medications to relieve the symptoms of certain types of arthritis and other conditions including:
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rheumatoid arthritis (a condition in which the body attacks its own joints, causing pain, swelling, and loss of function) in adults who have not been helped by other disease-modifying antirheumatic drugs (DMARDs),
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giant cell arteritis (a condition that causes swelling of blood vessels, especially in the scalp and head) in adults,
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systemic sclerosis-associated interstitial lung disease (SSc-ILD; also known as scleroderma-associated ILD: a lung disease that involves scarring of the lungs) in adults,
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polyarticular juvenile idiopathic arthritis (PJIA; a type of childhood arthritis that affects five or more joints during the first six months of the condition, causing pain, swelling, and loss of function) in children 2 years of age or older.
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systemic juvenile idiopathic arthritis (SJIA; a condition in children that causes inflammation in different areas of the body, causing fever, joint pain and swelling, loss of function, and delays in growth and development) in children 2 years of age or older,
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cytokine release syndrome (a severe and possibly life-threatening reaction) in adults and children 2 years of age or older after receiving certain immunotherapy infusions.
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Tocilizumab injection is in a class of medications called interleukin-6 (IL-6) receptor inhibitors. It works by blocking the activity of interleukin-6, a substance in the body that causes inflammation.
Chaparral - More Interactions
Chaparral interacts with 344 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.
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Drug descriptions are provided by MedlinePlus.