... sales since its initial introduction into the market in 1987. Sales for 1987 were $24.8 million and in three years rose to a little over 10x as much to $255.1 million. Retrovir sales for 1990 are forecasted to be 53% higher than the 1989 sales. This substantial large percentage of growth in Retrovir sales for Burroughs Wellcome is largely due to the fact it is currently the only FDA approved drug for the use in the preventment of preproduction of HIV in blood cells, to reduce the symptoms of HIV, and to slow down the damage it causes. Market Profitability: - Barriers to Entry One barrier to entry for the pharmaceutical drug industry is the extreme amount of government regulation controlling what and how drugs can be tested, sold, and distributed. Another barrier is patent and proprietary knowledge held by other companies in the industry, which prevent other companies from using that ...

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