Is entecavir an expensive patented drug or an imported drug?

Entecavir was introduced into China market by Squibb Company in 2005 under the trade name "Boludine", which is the so-called imported medicine. This is a patented drug. The patent has expired, and there are generic drugs at home and abroad. At present, China CFDA has approved Hainan Zhonghe Pharmaceutical, Jiangsu Zheng Da Tianqing Pharmaceutical, Suzhou Dong Rui Pharmaceutical, Jiangxi Qingfeng Pharmaceutical and Fujian Guangshengtang Pharmaceutical to produce entecavir preparations. The main dosage forms are orally dispersible tablets and capsules.