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.
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Reyataz is used with other medications to treat human immunodeficiency virus (HIV) infection. HIV causes the immune system to break down so that it can no longer fight off other infections. This leads to acquired immune deficiency syndrome (AIDS). HIV thrives by taking over the immune system's vital CD4 cells (white blood cells) and using their inner workings to make additional copies of itself. Reyataz belongs to a class of HIV drugs called protease inhibitors, which work by interfering with an important step in the virus's reproductive cycle. Reyataz is approved for used only in combination with other anti-HIV medications.