Garlic - Isoniazid, Pyrazinamide, Rifampin Interaction
Herbal: Garlic
Also Known As: Allium sativum, Aged Black Garlic Extract, Aged Garlic Extract, Ail, Ail Blanc, Ail Cultive, Ail Rocambole, Ajo, Alho, Allii Sativi Bulbus, Allium, Angio D'India, Black Garlic, Camphor Of The Poor, Clove Garlic, Common Garlic, Da Suan, Echte Rokkenbolle, Echter Knoblauch
Drug: Isoniazid, Pyrazinamide, Rifampin
Brand names:
Rifater
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
May 11, 2025
Interaction Details
Isoniazid, Pyrazinamide, Rifampin is classified as belonging to the following category: Isoniazid
Theoretically, garlic might decrease levels of isoniazid.
Animal research suggests that an aqueous extract of garlic reduces isoniazid levels by about 65%. Garlic reduced the maximum concentration (Cmax) and area under the curve (AUC), but not the half-life, of isoniazid. This suggests that garlic extract might inhibit isoniazid absorption across the intestinal mucosa; however, the exact mechanism of this potential interaction is not known.
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
- Dhamija P, Malhotra S, Pandhi P. Effect of oral administration of crude aqueous extract of garlic on pharmacokinetic parameters of isoniazid and rifampicin in rabbits. Pharmacology 2006;77:100-4.
Garlic Overview
Garlic (Allium sativum) is a popular culinary herb native to central Asia, but is now widely cultivated. It is a member of the onion family and is known for its pungent smell and flavor. In addition to its culinary use, it has been used medicinally to treat a variety of conditions, including high blood pressure, high cholesterol, and infections.
Garlic - More Interactions
Garlic interacts with 964 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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