antibiotics at room temperature - antibiotic storage (Mar/13/2009 )

If contamination is a suspected issue, push the solution through a 0.22 um syringe top filter.

I personally would toss the antibiotic and make a fresh stock because most of the time, the antibiotic comes into play after I've performed many laborious steps leading up to selection, and I'd rather waste some antibiotic then all that labor.