Original sentence: Berberine is considered an ineffective antibiotic, but a minority claim that when not tested in isolation but in conjunction with the other biochemical substances from the barberry plant, then berberine is indeed an effective antibiotic
Edited sentence: As Lewis puts it: "Plants have faced the problem of microbial multidrug resistance for far longer than we have, and their solution is apparently to use a combination of an antibiotic with an MDR inhibitor.Berberine is considered an ineffective antibiotic, but this perception is due to observations of its activity as an isolated compound; when tested in conjunction with other biochemical substances simultaneously as elaborated by the barberry plant, then berberine is indeed an effective antibiotic - promoted by the substances that are responsible for deactivating multidrug resistance  pumps in bacteria and restoring the activity of the berberine.Emulating Nature's strategy and potentiating antibiotics with MDR inhibitors can be an effective strategy against drug-resistant microorganisms