Levonorgestrel

Definition

Levonorgestrel is a synthetic progestin used in various hormonal contraceptives. It is commonly found in emergency contraceptive pills and intrauterine devices (IUDs).

5 Must Know Facts For Your Next Test

1. Levonorgestrel can prevent ovulation, fertilization, or implantation depending on when it is taken during the menstrual cycle.
2. It is most effective when taken within 72 hours after unprotected sex for emergency contraception.
3. Levonorgestrel-containing IUDs can provide long-term contraception for up to five years.
4. Common side effects include nausea, abdominal pain, and changes in menstrual bleeding patterns.
5. It does not protect against sexually transmitted infections (STIs).

Review Questions

• What are the primary mechanisms of action for levonorgestrel in preventing pregnancy?
• Within how many hours should levonorgestrel be taken to be most effective as an emergency contraceptive?
• What are some common side effects associated with levonorgestrel use?

Related terms

Progestin: A synthetic form of progesterone used in hormonal contraceptives.

Emergency Contraception: A method used to prevent pregnancy after unprotected sex or contraceptive failure.

Intrauterine Device (IUD): A small T-shaped device inserted into the uterus to prevent pregnancy for an extended period.