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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.
Differin is effective at clearing up pimples, whiteheads, and blackheads by clearing the pores of oil-blocking skin cells. It works to help skin cells shed normally rather than allowing them to accumulate in pores. Yet Differin is gentle. Its a light gel that feels nice on your skin. It doesnt contain alcohol which can overly dry your skin and it isnt oily so it wont leave any greasy residue behind.