"If you do not want to get pregnant, there are many birth control options to choose from. No one product is best for everyone. The only sure way to avoid pregnancy and sexually transmitted infections (STIs or STDs) is not to have any sexual"...
Plan B Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Plan B (levonorgestrel) is an emergency contraceptive that is used to prevent pregnancy after unprotected sex or failure of other forms of birth control (such as condom breakage, or missing 2 or more birth control pills). It is a female hormone that prevents ovulation. This medication is available in generic form. Common side effects include nausea/vomiting, abdominal pain, tiredness, dizziness, changes in vaginal bleeding, breast tenderness, diarrhea, or headache.
One tablet of Plan B should be taken orally as soon as possible within 72 hours after unprotected intercourse. The second tablet should be taken 12 hours after the first dose. Plan B may interact with rifampin, barbiturates, or seizure medicines. Other drugs may affect Plan B emergency contraceptive. Tell your doctor all prescription and over-the-counter medications you use. Plan B should not be used during pregnancy. If you become pregnant or think you may be pregnant, inform your doctor immediately. This medication passes into breast milk. Though there have been no reports of harm to nursing infants, consult your doctor before breast-feeding.
Our Plan B (levonorgestrel) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Plan B in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have severe pain in your lower stomach or side. This could be a sign of a tubal pregnancy (a pregnancy that implants in the fallopian tube instead of the uterus). A tubal pregnancy is a medical emergency.
Less serious side effects may include:
- nausea, diarrhea, or stomach pain;
- dizziness, tired feeling;
- breast pain or tenderness;
- changes in your menstrual periods; or
Read the entire detailed patient monograph for Plan B (Levonorgestrel) »
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Plan B Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these rare but very serious side effects occur: lower abdominal pain.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Plan B (Levonorgestrel)»
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Plan B FDA Prescribing Information: Side Effects
The most common adverse events in the clinical trial for women receiving Plan B® (levonorgestrel) included nausea (23%), abdominal pain (18%), fatigue (17%), headache (17%), and menstrual changes. The table below shows those adverse events that occurred in ≥5% of Plan B® (levonorgestrel) users.
Adverse Events in ≥ to 5% of Women, by % Frequency
|Plan B® |
N = 977 (%)
|Heavier Menstrual Bleeding||13.8|
|Lighter Menstrual Bleeding||12.5|
Plan B® (levonorgestrel) demonstrated a superior safety profile over the Yuzpe regimen for the following adverse events:
- Nausea: Occurred in 23% of women taking Plan B® (levonorgestrel) (compared to 50% with Yuzpe)
- Vomiting: Occurred in 6% of women taking Plan B® (levonorgestrel) (compared to 19% with Yuzpe)
DRUG ABUSE AND DEPENDENCE
There is no information about dependence associated with the use of Plan B® (levonorgestrel) .
Read the entire FDA prescribing information for Plan B (Levonorgestrel) »
Additional Plan B Information
Plan B - User Reviews
Plan B User Reviews
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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