What aspect defines a generic drug?

A generic drug is defined by its formulation being essentially identical to that of a brand-name drug but without the trademark protection. This means that the generic version contains the same active ingredients, dosage form, strength, and route of administration as the original brand-name medication. This equivalence allows generic drugs to be substituted for brand-name drugs, usually at a lower cost, while still providing the same therapeutic effects.

Generic drugs are created after the patent of the original brand-name drug expires, enabling multiple manufacturers to produce and sell the medication without infringing on the original manufacturer's intellectual property. Consequently, the pricing can become more competitive, increasing accessibility for patients.

The other options do not accurately represent the nature of generic drugs. They may describe aspects associated with brand-name medications or characteristics not applicable to generics.