Azithromycin
Azithromycin was discovered by a team of scientists working in the Research Institute of the pharmaceutical company PLIVA in Croatia in the late 70s. The drug was patented in 1981. The agreenment was signed between Pliva and Pfizer which allowed the use of azithromycin worldwide. Pliva sold it on the territory of Central and Eastern Europe under the name Sumamed becoming one of the biggest pharmaceutical companies in Central and Eastern Europe. Pfizer which sold the drug under the name Zithromax also saw great commercial success receiving  $2 billion in sales in the peak year.