- A prior review of this topic found
that the levonorgestrel only pills were more effective.
- Each year almost 1 million teenagers become pregnant, and between
74-82% of these pregnancies are unintentional.4
- Emergency contraception is indicated for the prevention of pregnancy
in women after a known/possible contraceptive failure, unprotected sex,
or sexual assault.5
- The most common indication for emergency contraception is thought
to be condom failure.2
- Pregnancy rates are lowest with emergency contraception if taken within
- Emergency contraception is thought to act primarily by inhibiting
or disrupting ovulation. In addition they may interfere with tubal transport
of the ova and/or sperm, inhibiting fertilization or by inhibiting implantation
through alteration of the endometrium.5
- The only contraindication to emergency contraception is known pregnancy,
and, with the Yuzpe method, those with close family history of thromboembolic
- 13% of adolescents reported withdrawal and 15% reported nothing as
their form of contraception at last intercourse.4
- In one study, 44% of adolescents reported use of contraceptives, but
only 17% reported use at last intercourse.4
- At the time of emergency contraception visit, it is imperative that
the initiation of long-term contraception is discussed and/or recommended.3
- Levonorgestrel only (Plan B) is less expensive ($30.99) than the Yuzpe
regimen (Preven), $114.00.
- Ho PC, Kwan MS. A prospective randomized comparison of levonorgestrel
with the Yuzpe regimen in post-coital contraception. Human Reproduction.
S, Rosenfeld WD. Contraception. Medical Clinics of North America.
PF, Daley AM. Oral contraceptive pills: Considerations for the adolescent
patient. Journal of Pediatric Health Care. 2000; 14:228-234.
SA, et al. Use of birth control pills, condoms, and withdrawal among
U.S. high school students. Journal of Adolescent Health. 2000;
MN. Emergency contraception: a review of current oral options. Western
Journal of Medicine 2002; 176:188-191.