1. What restrictions may apply to brand-name drugs in a therapeutic class?
Other formulary restrictions such as prior authorization and step therapy requirements also may apply to brand-name drugs in a therapeutic class.
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2. Why is it allowed to enter the market during the 180-day exclusivity period?
Because it is not approved through an Abbreviated New Drug Application, it is allowed to enter the market during the 180-day exclusivity period.
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3. What was the data set used in the analysis?
The data set used in the analysis contained information about all 332 drugs experiencing first generic entry in this period, including 200 completely new products and 132 new formulations of older drugs.
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4. How many years after first generic entry did new drugs retain a brand-name share?
On average, new drugs experiencing first generic entry in 1999–2000 maintained a share of 68 percent in the first full month of generic entry, declining to 44 percent at one year following first generic entry.
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