Final answer:
Individuals who are 17 years old and older can purchase Plan B, an emergency contraceptive, without a prescription in the United States. It should be taken within 72 hours after unprotected sex to prevent pregnancy.
Step-by-step explanation:
Age Requirement for Plan B Without Prescription
In the United States, Plan B (levonorgestrel), which is an emergency contraceptive, is available over-the-counter (OTC) without a prescription for individuals who are 17 years old and older. This medication is intended for use after unprotected intercourse or a known or suspected contraceptive failure, such as a broken condom. Plan B One-Step or Next Choice typically consists of a single pill dose and should be taken within 72 hours following unprotected sex for optimal effectiveness. It is important to note that while Plan B can prevent ovulation or fertilization, it is not designed to be a regular method of birth control and should not replace consistent contraceptive use.
Emergency contraception, including Plan B, operates by halting ovulation or preventing the sperm from joining with an egg, thus avoiding unwanted pregnancy. The availability and regulations for obtaining emergency contraception without a prescription may vary internationally, and some countries in Europe require a prescription or only offer it over-the-counter in specific circumstances.