University Health Services

Emergency Contraception


The Morning After Pill 


How it Works
How effective is it?
Risks and Side Effects
Who can’t take Emergency Contraception?
Emergency Contraception Options
How Emergency Contraception is prescribed
How to take Emergency Contraception
Important Notes
Emergency Contraception Hotline

Emergency contraception (EC) is the use of Plan B to prevent pregnancy after a contraceptive method has failed or because none was used.

How it Works:
If used within the first 72 hours after unprotected intercourse, EC probably works in one or more of the following reasons:

How Effective is it?:
If used within the first 72 hours after unprotected intercourse, EC is greater than 90% effective.



Side Effects:

Who can’t take Emergency Contraception?:

Emergency Contraception Options:

How Emergency Contraception is prescribed:

How to take Emergency Contraception:

  1. Take one dose within 72 hours of unprotected intercourse (take about 20 minutes after eating)
  2. Take the next dose 12 hours after the first dose (again, about 20 minutes after eating). If you vomit within an hour after taking the emergency contraception, call your health care provider 
    (you will probably need to repeat the dose or the whole procedure)

Important Notes:

Emergency Contraception Hotline
1-800-584-9911, 1-888-NOT-2-LATE

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