Zhuānlì dàoqī hòu, xǔduō yàochǎng huì tuīchū duìyìng de xuémíngyào.
Once a patent expires, many drug makers release corresponding generic versions.
Tips
usage
The mainland equivalent is 仿制药 (fǎngzhìyào). 学名药 is more common in Taiwan and Hong Kong, where '学名' literally refers to the scientific (non-brand) name of the active ingredient.