Medical abortions are considered safe and effective. Complications are rare. But it’s important to take all medications as prescribed. Skipping a dose or not following instructions can pose health risks. Risks of a medical abortion include: Failure to end the pregnancy or retained pregnancy tissue. Heavy bleeding that won’t stop. (This could lead to a need for a D&C.) Diarrhea and digestive pain. Allergic reaction to the medications. Infection (signs to look out for include an unpleasant vaginal odor and fever that lasts more than 24 to 48 hours). There are no long-term health risks associated with medical abortion.