Plan B
A type of emergency contraception that contains levonorgestrel, a synthetic progestin hormone, which works primarily by preventing ovulation and fertilization. Plan B is not intended for routine use as a regular contraceptive method and does not terminate an existing pregnancy.
Key Features:
- Active Ingredient: Levonorgestrel, a synthetic progestin hormone that is similar to the hormone progesterone, found naturally in the body.
- Mechanism of Action:
- Preventing Ovulation: By inhibiting the release of an egg from the ovary.
- Thickening Cervical Mucus: Making it more difficult for sperm to reach the egg.
- Altering the Endometrium: Making it less receptive to implantation by a fertilized egg, if fertilization occurs.
- Side Effects: Common side effects may include nausea, abdominal pain, fatigue, headache, and changes in menstrual bleeding patterns. Serious side effects are rare.
Online References:
- Centers for Disease Control and Prevention (CDC): Provides information on emergency contraception, including Plan B, its effectiveness, how it works, and how to use it.
- Mayo Clinic: Offers an overview of emergency contraception, including Plan B, its indications, effectiveness, side effects, and considerations.
- Charlotte Lozier – Provides information on Plan B side effects and considerations.