All new potential medicines needs to do a hERG-test. hERG stands for "human-ether-a-go-go-related gene" (the one who named it was most likely high) and it is a K-channel in heart cells, if something messes up with this channel your heart could stop, which leads to bad publicity, hence the test.

All new potential medicines needs to do a hERG-test. hERG stands for "human-ether-a-go-go-related gene" (the one who named it was most likely high) and it is a K-channel in heart cells, if something messes up with this channel your heart could stop, which leads to bad publicity, hence the test.