This is a rather general question. Please consider the following to refine your question:

In microbiology, we talk about a minimum inhibitory concentration (MIC), required to inhibit growth of bacteria. For bactericidal antibiotics, i.e. those killing bacteria, we use the term minimum bactericidal concentration (MBC). For practical reasons, in a laboratory MIC's are determined, independent of whether bacteriostatic (inhibiting) or bacteriocidal (killing) antibiotics are monitored.

A maximum concentration of both, inhibitory or bactericidal antibiotic, makes no sense. However, there is a maximum dose for treatment, which should not be exceeded.

Further to that, we would need to know, which bacteria you are about to target, and which antibiotics you want to use.

Anyway, you may check the EUCAST website, which provides breakpoints for a broad spectrum of bacteria and antibiotics (http://www.eucast.org/clinical_breakpoints/). Maybe it is that what you are looking for?

Hi Rajesh

You can use more method  e.g. Minimum Bactericidal Concentration (MBC) or Minimum Inhibitory Concentration (MIC)

Please  look in attach file 

Thanking you sir's Oliver Nolte ·and Alaa Kareem Niamah.