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Garlic Side Effects, Interactions and Warnings



  • Garlic reinforces warfarin action by heterogeneous mechanisms. It should thus not be used in patients on oral anticoagulant and/or antiplatelet therapy.
    - Oral anticoagulants and medicinal plants. An emerging interaction -- Argento A, Tiraferri E, Marzaloni M. -- Ann Ital Med Int. 2000 Apr;15(2):139-43.

  • Garlic may increase the risk of bleeding or potentiate the effects of warfarin therapy.
    - Am J Health Syst Pharm 2000 Jul 1;57(13):1221-7; quiz 1228-30 -- Potential interactions between alternative therapies and warfarin. -- Heck AM, DeWitt BA, Lukes AL.

  • Changes pharmacokinetic variables of paracetamol, decreases blood concentrations of warfarin and produces hypoglycaemia when taken with chlorpropamide.
    - Drugs 2001;61(15):2163-75 -- Interactions between herbal medicines and prescribed drugs: a systematic review. -- Izzo AA, Ernst E.

  • May produce bad breath, heartburn, flatulence, gastrointestinal irritation and nausea. These are the most common side effects. Odorless products may lessen the effect of bad breath.
    - Murray, M. -- The Pill Book Guide to Natural Medicines: Vitamins, Minerals, Nutritional Supplements, Herbs, and Other Natural Products. -- Bantam, 2002. 659.

  • It would be wise to consult with your physician if you suffer from type 2 diabetes as garlic may increase the effectiveness of drugs that reduce blood sugar levels.
    - Murray, M. -- The Pill Book Guide to Natural Medicines: Vitamins, Minerals, Nutritional Supplements, Herbs, and Other Natural Products. -- Bantam, 2002. 659-660.








last update: February 2014



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