Which of the following describes an adulterated drug?

An adulterated drug is defined primarily by its failure to meet the established standards for purity and potency set forth by regulatory agencies like the FDA. When a drug is adulterated, it may contain harmful substances, insufficient amounts of active ingredients, or contaminants that compromise its safety and efficacy. This legal and regulatory framework ensures that medications are not only safe for consumption but are also effective in delivering the intended therapeutic benefits. Thus, the option indicating that a drug does not meet these standards for purity and potency correctly defines an adulterated drug.

The other options do not accurately describe adulteration. For instance, accurate labeling with dosage information signifies compliance with labeling regulations rather than adulteration. A drug containing no active ingredients could be deemed misbranded rather than adulterated if it fails to meet therapeutic efficacy requirements. Similarly, having an unknown manufacture date may raise concerns about a drug's legitimacy or storage conditions but does not directly relate to its adulteration status.