Are You Taking Plan B Correctly? 6 Mistakes Women Make With The Morning-After Pill

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You Take Certain Pills

An open capsule with its contents on a terracotta background.

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There are some medications that can reduce the effectiveness of the morning-after pill, according to Health Unit. These include:

  • Anti-HIV drugs
  • Antibiotics
  • Rifabutin (brand name Mycobutin)
  • Griseofulvin (brand name Gris-PEG)
  • John’s wort
  • Anticonvulsants (epileptic seizure medications such as Lyrica, Neurontin and Tegretol)
  • Rifampicin (brand names Rifadin and Rimactane)
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