When available, information about possible serious side effects is shown with 100 faces. If 100 people were to take a treatment, the number of red frowning faces shows how many might experience a serious side effect. There will always be an explanation with the faces.

In the example here, 3 of the 100 faces are red and 97 are black. So if 100 people were to take this treatment, 3 might experience a serious side effect.