The FDA has just approved a new contraceptive. This so-called morning-after pill called Ella is effective for five days after intercourse. Unlike Plan B, the first emergency contraceptive marketed in the U. S., Ella does not contain hormones. Instead, it prevents pregnancy by blocking the effects of progesterone. Ella will be available only by prescription. Side effects may include abdominal pain, headache, fatigue, menstrual discomfort, nausea or dizziness. It has been used in Europe for more than a year.