A generic drug is exactly the same dosage, safety, strength and quality as a brand named drug. Generic drugs also do not take longer to work in the body, again, its the same ingredients as the name you are more familiar.
The reason generic drugs are cheaper is because the makers of these drugs don't have the costs of the original developer of the drug. When the patent on the developer expires, 20 years, other manufactures can introduce competitive generic versions to the FDA for approval. This also creates greater competition in the industry once generic drugs are approved and keeps costs lower.
A great place to go is here for more information on your generic drugs.
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Posted at 1:37PM on Jul 14th 2007 by crak