Dentists are wonderful. If you have bad teeth like I do and need an occasional root canal, they issue you antibiotics before they do surgery. Sometimes, your dentist does it and then the root-canal specialist does it also. This means you have extras! I have kept several regiments of these 'extra' antibiotics in the freezer in a freezer Ziploc.
Two weeks ago, I have the start of a tooth ache in my jaw - about a 2 out of 10 on the pain scale. I can't get to the dentist due to my travel schedule. When the pain later on hits 5-7 out of ten, I take a regiment out of the freezer that is THREE YEARS BEYOND IT'S EXPIRATION DATE and take it. In 24 hours, pain is down to a 2 again, and by the time I finish a week later, pain is about a 1. It works like it was supposed to. Today it's down to about 0.1 on the 10 scale of pain.
Then, I go to the specialist yesterday and he prescribes me some more antibiotics!
The new prescription is in the freezer, replacing the one I used. And, the tooth gets fixed on Monday.
The freezer is our friend for extending medicine life!