I agree that antibiotics are going to be severely in short supply, but some education as to when, how much, when not to, etc. is needed as well. I would highly suggest anyone getting their hands on antibiotics also ensure they have a doctor, nurse, or pharmacist for asking questions before using them.
I whole-heartedly agree that you get professional advice before administration of any medication.
That includes information about dosage size, intervals between dosages, etc.
Most doctors offices have a PDR (Physicians Desk Reference) which annually updates dosages, photo, identification,
any record of adverse reactions and contra-indications of most medications.
I stress ANNUALLY, and as I recall they publish around January, so many doctors will through out last years copy when they get a new one which is updated annually.
If you are familiar with a particular doctor, you could ask for the outdated copy when the replacement comes in,
and they may give you the non-current copy.