How long after the expiration date on the heartworm package is the drug good for?
answer As with all drugs or pharmaceutical products, heartworm preventives should be used before the expiration date on the package. The expiration date is established by a series of tests mandated by the U.S. Food and Drug Administration (or relevant international agency) to provide assurance that the potency and effectiveness of the product justifies the claims and uses on the label and that no significant deterioration of the product has taken place. It is unwise to use expired product, as it is impossible to predict if it will be effective or safe.
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