does frontline flea medicine expire?
on Jun 27th 2012
in Pet Products
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Like all prescription drugs it does, indeed, expire. The date will be on the crimp of the tube, in addition to appearing on the package itself.
Any mix of drugs such as this can breakdown and either lose effectiveness OR become more toxic with the passage of time.
Obviously, a few months should not make a huge difference if they have been properly stored in a cool, dark, dry place but much over that should be discarded as you would ANY outdated prescription drug for yourself or your family.