Cascara Sagrada - Famvir (Famciclovir) Interaction
Herbal: Cascara Sagrada
Also Known As: Frangula purshiana, Rhamnus purshiana, Bitter Bark, Buckthorn, California Buckthorn, Cascara Sagrada, Chittem Bark, Dogwood Bark, Nerprun, Pastel Bourd, Purshiana Bark, Rhamni Purshianae Cortex, Rhubarbe des Paysans, Sacred Bark, Sagrada Bark, Yellow Bark
Drug: Famciclovir
Brand names:
Famvir
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Jun 22, 2025
Interaction Details
There were no interactions found between Famciclovir and Cascara Sagrada. This does not mean the potential for an interaction does not exist, however. There is often a lack of studies and data surrounding traditional medicine, especially concerning drug interactions, so it is important to always consult your provider before making any changes to your medication regimen.
Cascara Sagrada Overview
Cascara sagrada is a tree native to the Pacific coast of North America. The name "cascara sagrada" means "sacred bark" in Spanish.
The bark of Cascara sagrada is used in traditional medicine most commonly as a laxative as it contains anthraquinone glycosides, which stimulate the muscles in the walls of the intestines, increasing peristalsis and promoting bowel movements. It is also used as a treatment for hemorrhoids and is sometimes used as a natural remedy for liver and gallbladder problems.
Famciclovir Overview
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Famciclovir is used to treat herpes zoster (shingles; a rash that can occur in people who have had chickenpox in the past). It is also used to treat repeat outbreaks of herpes virus cold sores or fever blisters in people with a normal immune system. Famciclovir is used to treat repeat outbreaks and to prevent further outbreaks of genital herpes (a herpes virus infection that causes sores to form around the genitals and rectum from time to time) in people with a normal immune system. Famciclovir is also used to treat returning herpes simplex infections of the skin and mucus membranes (mouth, anus) in people with human immunodeficiency virus (HIV) infection. Famciclovir is in a class of medications called antivirals. It works by stopping the spread of the herpes virus in the body. Famciclovir does not cure herpes infections and may not stop the spread of herpes virus to other people. However, it may decrease the symptoms of pain, burning, tingling, tenderness, and itching; help sores to heal; and prevent new sores from forming.
Cascara Sagrada - More Interactions
Cascara Sagrada interacts with 724 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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