Another thing to think of re:Rx meds-If they are in Pill or tablet form & are Buffered(Hardened) the potency will last quite a bit longer than Non-buffered,this really applies to Pain meds for the most parts,they are Buffered so breaking them down for Intreveinious use is difficult & for longer preservation of potency in stocks.
Sorry to have to disagree:
Buffering has nothing to do with hardness (hardening) of the pill or tablet. Buffering is the addition of buffering agents/chemicals that resist changes in pH. For example in bufferd asprin, the name brand Bufferin uses MgO. Other preparations use CaCO3.
Pete
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