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The act of introducing a needle breaks the sterility barrier, and while the preservative system (typically benzyl alcohol) helps maintain sterility after puncture, it cannot do so indefinitely

GLP-1 drugs may also cause other side effects, among them nausea, gastrointestinal issues and fatigue

Stored properly in the refrigerator and away from light, a reconstituted vial generally stays usable for several weeks thanks to the benzyl alcohol preservative in bacteriostatic water

Mistake 4: not cleaning the vial stoppers Every time you insert a needle through the rubber stopper, it can push surface bacteria into the solution