Lorenzi V, Muselli A, Bernardini AF, Berti L, Pagès JM, Amaral L, Bolla JM
Antimicrobial Agents and Chemotherapy, 2009
The essential oil of Helichrysum italicum significantly reduces the multi-drug resistance of Enterobacter aerogenes, Escherichia coli, Pseudomonas aeruginosa, and Acinetobacter baumannii. Combinations of the two most active fractions of the essential oil with each other or with phenylalanine arginine beta-naphthylamide yield synergistic activity. Geraniol, a component of one fraction, significantly increased the efficacy of beta-lactams, quinolones, and chloramphenicol.
Lorenzi V, Muselli A, Bernardini AF, et al. Geraniol restores antibiotic activities against multidrug-resistant isolates from gram-negative species. Antimicro Agents Chemother. 2009;53(5):2209-2211.