Emergency Contraception (EC)

Preferred: Levonorgestrel (Plan B®) 1.5 mg PO as a single dose.


Alternative: Levonorgestrel 0.75 mg PO bid x 2 doses if a single 1.5 mg dose is not likely to be tolerated. Dimenhydrinate 50 mg PO given 30 minutes before the second dose of levonorgestrel may prevent vomiting.



  • EC should be taken as soon as possible within 72 hours after exposure (efficacy declines after this, but some benefit may be achieved up to 120 hours after exposure).
  • EC is contraindicated if there is evidence of an established pregnancy as confirmed by a positive pregnancy test.