Abstract
Within the pharmaceutical prescription sector, just like many other markets, maintaining competitive advantage has become increasingly difficult. In the healthcare arena, the period of time that a new chemical entity has on the market before a key competitor emerges has been significantly reduced. If a company has already developed an important market franchise in a given sector or disease area, it is essential that that company understands the potential threats it is likely to face in the future from new product entries and also to appreciate what, if anything, could be done to protect or enhance the product franchise in the light of market developments.
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