Antibiotic shelf life?

William C. (Bill) Johnson ez003195 at
Fri Mar 10 00:04:44 EST 1995

General question - how long do most antibiotics retain their effectiveness?

Specifically - how useful is, say, the four year old tube of ampicillin I 
found in the -20 freezer?  I've been told that most antibiotics in an 
agar plate are only good for a few weeks, and now I wonder about our stocks.


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