ECPs can cause temporary side effects. ECPs sometimes cause nausea, which may occasionally result in vomiting. These can usually be avoided by taking them with food and water. If necessary, they can be controlled with additional medication. Sometimes they can cause headaches, dizziness, cramping, or breast tenderness.
Most women have no side effects after taking ECPs.
ECPs can cause your period to come a few days early or a few days late. A pregnancy test is advised if your period is more than one week later than expected. ECPs do not protect against AIDS and other sexually transmitted diseases like syphilis, gonorrhea, chlamydia and herpes. If you are worried about whether you may have been infected with AIDS or other sexually transmitted diseases, talk to your healthcare provider for advice. Available information suggests that there is no risk to the fetus if the treatment fails or is taken during an already established pregnancy.