Pinworms: Pregnancy category C. The safety of drugs used to treat pinworms have not been studied for pregnant women. If the infection is compromising the pregnancy (i.e. weight loss, sleeplessness) then treatment can be considered, but should be withheld until the 3rd trimester when the risk, if any, to the fetus is likely to be reduced. Hope this clears things up. DrG
Answered 4/9/2018
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