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Written by a veterinarian;
Quote: The rate of decomposition is halved for every 20 degrees farenheight the temperature is lowered. It works this way: Tetracycline, with shelf life of 5 years at 60 F, lasts 10 years at 40F, 20 years at 20F, 40 years at 0f, or in a home freezer.
Pennicillin in 100cc bottles or less can be laid on their side and frozen without bursting the bottle, and will also last 40 years in a freezer. mix well when thawed and all is well. Liquids can be frozen in small bottles with more than 10 % air space in them. (Ice expands 10%, and in bottles more than about an inch and half diameter the walls can't stand the pressure ice exerts before it melts from pressure, to relive its expansion through this melting, so they crack as they freeze. Still good, but a mess when they thaw. You can still freeze larger bottles but you have to nurse them as they freeze by shaking them up to put air foam into the ice, to relieve the pressure. Best to keep at least a quarter of the bottle volume as air, in those you want to try this on.
Note that this formula is for chemicals, not biologicals. Biologicals are things like live vaccines, and seeds etc which are expected to be alive when thawed. Biologicals have very varied life extensions from cooling them down, but in all cases known to me, they double life in much less than the 20F required to half the chemical thermal deterioration rate mentioned above.
As for powdered medicines, no problem, store them in the freezer, in moisture proof containers, and they will last about as long as you will.