
Birth control pills cause a small but significant increase in the risk of the most common type of stroke, according to a comprehensive report. Worldwide, more than 100 million women currently use oral contraceptives or have used them in the past. In the United States, there are about 40 brands of oral contraceptives and 21 brands of emergency contraceptive pills.
http://www.sciencedaily.com/releases/2015/09/150918132654.htm