Emergency Contraception

Emergency contraception -- also called postcoital contraception -- is a form of birth control that may be used by women who have had unprotected sex or used a birth control method that failed. The treatment generally is reserved for specific situations and is not a regular method of birth control. Emergencies include being raped, having a condom break or slip off during sex, or missing two or more birth control pills during a monthly cycle. Emergency oral contraception is used to prevent a pregnancy, not end one. They work primarily by delaying ovulation. Emergency contraception does not protect against sexually transmitted diseases. It is not RU-466, the medication used to induce abortions.

Plan B One-Step is a specifically packaged emergency contraception. It is available to anyone over the counter without a prescription or age restrictions.

Ella is a non-hormonal pill. It contains ulipristal, a non-hormonal drug that blocks the effects of key hormones necessary for conception. It is available only by prescription.

How Does It Work?

Plan B One-Step emergency contraception may prevent pregnancy by temporarily blocking eggs from being released, by stopping fertilization, or by keeping a fertilized egg from becoming implanted in the uterus. Plan B One-Step is taken in one dose with one pill. Its effectiveness depends on how soon you take the pill. It should be taken as soon as possible -- within 72 hours of unprotected intercourse. When Plan B One-Step is taken as directed, it can reduce the chance of pregnancy by close to 90%.

Ella can be taken up to 120 hours after sex. It is taken as one tablet in one dose.

An IUD can be inserted to prevent pregnancy. The device works by stopping implantation of a fertilized egg in the uterus within 5 to 7 days after unprotected intercourse.

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How Effective Is Emergency Contraception?

If Plan B One-Step is taken as directed after unprotected sex, it will decrease the chances of a pregnancy occurring. About 7 out of every 8 women who would have gotten pregnant do not become pregnant. However, research shows that Plan B One-Step starts to lose its effectiveness in women heavier than 165 pounds and is not recommend for anyone over this weight. Instead, an IUD is the suggested option in this group.

In two reported studies, Ella significantly reduced the pregnancy rate from an expected rate of 5.5% and 5.6% to 2.2% and 1.9%, respectively. In a pooled analysis of the data, the effectiveness did not fade for 120 hours after unprotected sex.

An IUD can be up to 99% effective when inserted within 5 to 7 days after unprotected intercourse.

Where Can I Get Emergency Contraception?

Emergency contraceptive pills (ECPs) are available at Planned Parenthood; college, public, and women's health centers; private doctors; and some hospital emergency rooms.

Some doctors will prescribe ECPs over the phone and call the prescription in to a pharmacy. As mentioned above, Plan B One-Step is available at pharmacies without a prescription.

Who Should Not Use ECPs?

Plan B One-Step will not affect an implanted pregnancy. Ella should not be used by women who are already pregnant or may be pregnant. The risk to a human fetus is unknown. Animal studies have demonstrated risk of fetal loss. Also, women who have had clotting disorders or deep venous thrombosis (DVT) should not use Plan B One-Step.

Are There Any Side Effects Associated With Emergency Contraception Pills?

The most common side effects associated with emergency contraception pills include:

Ask your doctor or pharmacist about ways to reduce nausea. They may prescribe some anti-nausea medicine for you to take before you take an ECP.

Does It Protect Against Sexually Transmitted Diseases (STDs)?

No. Emergency contraception will not protect you from contracting an STD, such as HIV, the virus that causes AIDS. The best way to avoid getting STDs is to limit sexual contact to one uninfected partner. If that is not an option, use a latex condom correctly every time you have sex.

WebMD Medical Reference Reviewed by Brunilda Nazario, MD on August 30, 2016

Sources

SOURCES: 

The National Women's Health Information Center: "Plan B."

News release, FDA.

FDA.

Duramed Pharmaceuticals, Inc.

Teva Women's Health, Inc. 

Healthy Canadians web site.

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