As mentioned by Garzie and WBF, microorganisms have a harder time gaining resistance when multiple agents are involved.
In fact, there is one study that adds herbs to antibiotics to prevent the microorganisms to become resistant to the antibiotics. As the herbs and antibiotics will work synergistic.
Quotes:
" In some cases, MDR microorganisms, which are called “pan-resistant organisms”, have become resistant to all the available antibiotics and cannot be treated with any single antibiotic alone "
[...]
"One such novel therapeutic strategy involves the use of natural antimicrobial compounds such as plant-derived products such as spices, essential oils, the extracts or the consumption of herbal teas alone
or in combination with antibiotics."
[...]
"Antibiotic and herbal tea
combinations may be recommended for severe infections in order to rapidly enhance bactericidal activity and help
prevent or delay the emergence of resistance."
[...]
"The most desirable targets for combination therapy is synergistic drug interactions followed by the prevention of resistance and minimization of toxicity and cost."
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc5533155/