A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.
The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.
Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.
Neulasta is used to treat neutropenia, a lack of certain white blood cells caused by receiving cancer chemotherapy. Neulasta is used in people with cancers other than bone marrow cancer.
You should not use Neulasta if you are allergic to pegfilgrastim, filgrastim (Neupogen), or to other medicines made with the E. coli bacteria. Before using Neulasta, tell your doctor if you are allergic to any drugs, or if you have sickle cell disorder. You may need a dose adjustment or special tests to safely use Neulasta.