Fever Bark - Marplan (Isocarboxazid) Interaction
Herbal: Fever Bark
Also Known As: Alstonia constricta, Alstonia Bark, Australian Febrifuge, Australian Fever Bush, Australian Quinine, Bitterbark, Corteza de Alstonia, Devil Tree, Devil's Bit, Dita Bark, Écorce Amère d'Australie, Écorce de Quinquina, Écorce de Quinquina d'Australie
Drug: Isocarboxazid
Brand names:
Marplan

Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
May 18, 2025
Interaction Details
Isocarboxazid is classified as belonging to the following category: Monoamine Oxidase Inhibitors (Maois)
Concomitant use of MAOIs with fever bark can result in additive effects.
Yohimbine, a constituent of fever bark, has MAO inhibitory effects. At high doses, yohimbine is a non-selective inhibitor of MAO. It is not known if this would occur with fever bark.
Interaction Rating
Likelihood of Occurrence
LikelyWell-controlled human studies have demonstrated the likely existence of this interaction
References
- Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
- McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
Fever Bark Overview

Isocarboxazid Overview
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Isocarboxazid is used to treat depression in people who have not been helped by other antidepressants. Isocarboxazid is in a class of medications called monoamine oxidase (MAO) inhibitors. It works by increasing the amounts of certain natural substances in the brain that help maintain mental balance.
Fever Bark - More Interactions
Fever Bark interacts with 790 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.