Absence of antimycobacterial synergism between garlic extract and antituberculosis drugs.

Garlic extract inhibited the growth of four strains of Mycobacterium tuberculosis, three strains of Mycobacterium avium-intracellulare, and three strains of Mycobacterium kansasii in concentrations ranging from 0.98 mg/ml to 2.94 mg/ml. Synergism could not be demonstrated when garlic extract was added to various concentrations of four commonly used antituberculous drugs.