Two to six percent of all pregnant women develop preeclampsia. In the worst case its complications threaten the life of both the fetus and the mother. It seems that especially an early and severe preeclampsia diagnosed before 34 weeks of pregnancy can be prevented by using low-dose acetylsalicylic acid medication, which shall be started sufficiently early, not later than pregnancy week 16. Acetylsalicylic acid is safe during pregnancy at a daily dose of 100 mg. For the prevention of preeclampsia, it is worth considering for women who are at high risk of developing the disease.