The researchers analyzed four drugs: Allegra, Arava, Amaryl and Zithromax. In the second half of 2005, each of these drugs run out of patent protection. Their generic equivalents were bought instead at an average factor of 87 percent within 30 days of the equivalents delivery at pharmacies.
The research was organized by Medco Health Solutions Inc. based in Frankin Lakes, which is the biggest drug benefit management company in U.S. The company bargains for low prices of prescription drug on behalf of its customers.
According to the study, Zithromax, the blockbuster of Pfizer Inc. with its annual sales of $1.85 billion was rapidly substituted at pharmacies by generic equivalent at a 90 percent rate just after it lost its patent protection in November.
The study authors mentioned the substitution of Zithromax, an antibiotic for respiratory infections, as evidence that more and more doctors prescribe generic versions of brand name drugs more easily, even if it is about so-called acute care drugs, such as Zithromax.
The really good news is that these four generic medications are just the start. With a number of popular medications expected to move off...
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