Plan B One-Step

Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 5/31/2022
Drug Description

What is Plan B One-Step and how is it used?

Plan B One-Step is an over the counter and a prescription medicine used to as an emergency contraceptive for prevention of pregnancy after unprotected sex of failure of other forms of birth control. Plan B One-Step may be used alone or with other medications.

Plan B One-Step belongs to a class of drugs called Progestins; Contraceptives, Oral.

What are the possible side effects of Plan B One-Step?

Plan B One-Step may cause serious side effects including:

  • severe pain in your lower stomach or side,
  • hives,
  • difficulty breathing, and
  • swelling of your face, lips, tongue or throat

Get medical help right away, if you have any of the symptoms listed above.

The most common side effects of Plan B One-Step include:

  • mild stomach pain,
  • breast pain or tenderness,
  • nausea,
  • vomiting,
  • diarrhea,
  • headache,
  • dizziness,
  • feeling tired, and
  • changes in your menstrual periods

Tell the doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of Plan B One-Step. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Drug Facts

Active ingredient

Levonorgestrel 1.5mg Tablet

Side Effects & Drug Interactions


No information provided. Please refer to the WARNINGS section.


No information provided.

Warnings & Precautions


Allergy alert: Do not use if you have ever had an allergic reaction to Levonorgestrel

Sexually transmitted diseases (STDs ) alert: This product does not protect against HIV/AIDS or other STDs

Do not use

  • if you are already pregnant (because it will not work)
  • for regular birth control

When using this product you may have

  • menstrual changes
  • nausea
  • lower stomach (abdominal) pain
  • tiredness
  • headache
  • dizziness
  • breast pain
  • vomiting


No information provided.

Overdosage & Contraindications


In case of overdose, get medical help or contact a Poison Control center right away.


No information provided

Clinical Pharmacology


No information provided.

Medication Guide


No information provided. Please refer to the WARNINGS section.

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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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