Plan B, however, lacks estrogen and does not pose a threat to already existing problems, and the chances of minor side effects are reduced. Because of the risks associated with Preven, many doctors including Neinstein and Mishelle prefer Plan B over Preven. However, when women take these hormones frequently or as an alternative form of birth control, they can experience side effects from the heavy hormone dosages. The most common ones are vomiting, nausea and fatigue, and in very extreme cases, a small percentage of women experience blood clots. According to the Preven Emergency Contraception Center, serious side effects such as blood clots, heart attacks, and strokes can occur.
Smoking increases the chance of serious side effects.
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