If the sections of the Antimicrobial App. or the microbiology report don't help then, in hours, or if urgent/an emergency, phone for advice.
You do not need to phone about alert/restricted/reserve antibiotics if the antibiotic is recommended in an approved guideline for the indication for which you are using it.
If you think you need to use a reserve antibiotic (see the NHS Lothian Antimicrobial Management Team intranet page for definitions and a list) and it is not recommended as part of a guideline then discuss with microbiology within 24 hours of starting the antibiotic.