Women Home > Plan B Drug Interactions

Certain barbiturates, seizure medications, and antibiotics may interfere with Plan B. Drug interactions such as these could decrease the level of Plan B in your blood, possibly increasing the risk of pregnancy. However, it is not known for certain if these medications truly have an effect on Plan B. If you have any concerns about possible drug interactions with Plan B, you should contact your healthcare provider.

An Introduction to Plan B Drug Interactions

Plan B One-Step™ (levonorgestrel) can potentially interact with several other medicines. Some of the medicines that may lead to Plan B drug interactions include:
  • Aminoglutethimide (Cytadren®)
  • Aprepitant (Emend®)
  • Barbiturate medications, such as:
    • Amobarbital (Amytal®)
    • Butalbital (Fioricet®, Fiorinal®)
    • Pentobarbital (Nembutal®)
    • Phenobarbital (Luminal®)
    • Primidone (Mysoline®)
    • Secobarbital (Seconal®)
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
List of references (click here):
Other Articles in This eMedTV Presentation




Related Channels

eMedTV Links
Copyright © 2006-2020 Clinaero, Inc.

eMedTV serves only as an informational resource. This site does not dispense medical advice or advice of any kind. Site users seeking medical advice about their specific situation should consult with their own physician. Click Terms of Use for more information.

This site complies with the HONcode standard for trustworthy health information:
verify here.