Words to Know

Pregnancy Categories

• Category B

  Animal studies suggest no fetal risks but studies in pregnant women are limited/unavailable OR animal studies suggest fetal risks but studies in pregnant women do not (Murase, Heller, & Butler, 2014).

• Category C

  Studies in pregnant women and animals are unavailable OR studies in pregnant women are unavailable but animal studies suggest fetal risks (Murase, Heller, & Butler, 2014).

• Category D

  Studies in pregnant women suggest fetal risks (Murase, Heller, & Butler, 2014).

• Category X

  Animal studies or studies in pregnant women suggest its contraindication (Murase, Heller, & Butler, 2014).

Certainty of Evidence

Certainty of evidence for treatments according to British Journal of Dermatology guidelines (ranging from very low certainty to high certainty)