Do not take garlic without medical advice if you are using any of the following medications:
acetaminophen (Tylenol);
birth control pills;
chlorzoxazone;
cyclosporine;
theophylline;
warfarin (Coumadin, Jantoven);
HIV or AIDS medicines--delavirdine, efavirenz, nevirapine, saquinavir;
medicine used to prevent blood clots, such as alteplase, clopidogrel, dipyridamole, ticlopidine, and urokinase; or
NSAIDs (nonsteroidal anti-inflammatory drugs)--aspirin, ibuprofen (Advil, Motrin), naproxen (Aleve), celecoxib, diclofenac, indomethacin, meloxicam, and others.
Do not take garlic without medical advice if you are using a medication to treat any of the following conditions:
any type of infection (including HIV, malaria, or tuberculosis);
anxiety or depression;
asthma or allergies;
cancer;
erectile dysfunction;
heartburn or gastroesophageal reflux disease (GERD);
high blood pressure, high cholesterol, or a heart condition;
migraine headaches;
psoriasis, rheumatoid arthritis, or other autoimmune disorders;
a psychiatric disorder; or
seizures.
This list is not complete. Other drugs may affect garlic, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Garlic drug interactions (more detail)
