Four brands of drugs made in China that are supposed to lower blood pressure were removed from shelves in Taiwan recently because they were suspected of containing cancer-causing ingredients.

This observation came into light few weeks ago when types of valsartan produced in China by Huahai Pharmaceutical, based in the province of Zhejiang, were questioned.

According to the FDA, the recall of these drugs might take up to a month to complete. Users of the blood pressure drugs were asked not just to stop taking them, but to also head back to consult their doctors on how to replace the potentially problematic pills.