Cadence OTC Morning After Pill Emergency Contraceptive | Compare to Plan B One-Step | 1.5mg Levonorgestrel | Effective Backup SoMorning After Pill by Cadence OTC is an emergency contraceptive. Its a form of birth control that is meant to be used if your regular birth control failed or if you forgot to use birth control. Morning After Pill should be taken within 72 hours of unprotected sex or birth control failure. The sooner you take it, the better it works. Use as directed.