Buy some certainly, but don’t stockpile cases of something that may kill one of you.
The other problem, most of these items have a fairly definite shelf life, after time some can become either very weak or potentially dangerous.
If memory serves, tetracycline after a couple of years can become dangerous. Will have to look that up.
Perhaps we can get our host to jump in on this one.
And I hate to say it, but sometimes the bush hippies are right and there are some good natural cures available. Time to do the research while we can.