A pharmaceutical product usually intended to be interchangeable with the originator brand product, manufactured without a licence from the originator manufacturer and marketed after the expiry of patent or other exclusivity rights.
Generic medicines are marketed either under a nonproprietary name (INN) (e.g., diazepam) or, occasionally, another approved name rather than under a proprietary or brand name.

However, they are also quite frequently marketed under brand names, often called “branded generics.”
Many different branded generic products of the same medicine can be on the market in a country along with the originator brand product.

World Health Organization. Measuring medicine prices, availability, affordability and price components. Internet. Accessed on January 24, 2016.