Primary Care unit revenues decreased 28% operationally in comparison with fourth-quarter 2011, primarily due to the losses of exclusivity of Lipitor in most major markets, as well as the resulting shift in the reporting of U.S. and Japan Lipitor revenues to the Established Products unit beginning January 1, 2012. This decline in revenues for Lipitor and for certain other Primary Care unit products that lost exclusivity in various markets in 2012 and 2011 reduced Primary Care unit revenues by approximately $1.8 billion, or 33%. The impact of this decline was slightly offset by the continued strong operational growth of Lyrica in developed markets as well as Celebrex and Viagra in the U.S.
Specialty Care unit revenues declined 2% operationally in comparison with fourth-quarter 2011. Revenues were positively impacted by growth of the Prevnar/Prevenar franchise, primarily due to the timing of U.S. government purchases, as well as growth of Enbrel and Rebif, mostly in the U.S., in addition to Benefix, ReFacto/Xyntha and Zyvox. This increase was more than offset by approximately $360 million, or 9%, due to product losses of exclusivity.
Emerging Markets unit revenues grew 20% operationally in comparison with fourth-quarter 2011. This growth was primarily driven by strong volume growth in China as a result of more targeted promotional efforts for key innovative and established products, including Lipitor, Norvasc and Sulperazon, and overall market growth, as well as the timing of government purchases of Enbrel in Brazil and Prevenar 13 in Turkey in comparison with the year-ago period.Established Products unit revenues increased 5% operationally in comparison with the prior-year period, primarily reflecting the inclusion of $200 million of U.S. and Japan branded Lipitor revenues in fourth-quarter 2012. This increase was partially offset by the decline of revenues of certain products that recently lost exclusivity and the impact of ongoing pricing pressures, primarily in developed Europe and South Korea. Total revenues from established products in both the Established Products and Emerging Markets units were $3.5 billion, with $1.1 billion generated in emerging markets.