Good question, good householder, and my person gave it also thoughts, whether proper to accept and to make use. As far as understanding the work of Antibiotics, as far as informed, they 'only' stop reproducing. So one somehow stops 'orgies' if having such perceptions, and let's live on. There are also natural antibiotics, such as honey, which are allowed, like most kind of medicine.
Surely, the Buddha did not wished his disciple to harm other life, or conduct wrong to gain medicine. If one would be aware, having the perception, of 'that's means to kill' and 'there are those to kill', then one would not easy stay remorseless/faultless, of which is of much more benefit then to gain temporary health (or even not either).
From experiances, yet sure a matter of gained liberality, metta does 'wonders' that occupations end, aside of the proper reflections for sick.
Generaly 'knowing' much, perceiving much, much ideas, do not turn toward stay simple but make all much more complicated.
Feeling not well, act in doubt, is always already a fault, so pretty good to go after doubtlessness.
For someone with Sila, metta, a go through the factors (in regard of precepts) or even look at the mind (to cover the whole range of kamma), are of releasing help.
