A crackdown on corruption and pricing in China’s fast-growing pharmaceutical market has squeezed profits and margins, raising a red flag to global Big Pharma that the days of easy growth in the country may be over. A Reuters’ analysis of more than 60 listed Chinese healthcare firms shows average profit margins declined to around 10 percent last year from 15 percent in 2012. China has been a magnet for the big global pharmaceutical companies and other healthcare firms as growth slows in Europe and the United States.