How much Benadryl can you take in pregnancy? Doctors usually recommend taking a 25mg to 50mg oral dose once every six hours [11] in the first trimester, while the dosage should not generally exceed 25mg in six hours during the last two trimesters [6, 7]. Use of topical Benadryl is considered safe in pregnancy as there is little evidence of harm to the fetus. However, there is inadequate data regarding whether the diphenhydramine in the ointment form crosses the placenta [5].
Best Answer: Mutagen: a substance that causes mutation, i.e. that causes changes in genes. Teratogen: Substance that deforms the fetus in the womb and so induces birth defects. Carcinogen: a substance that causes cancer. All of them give undesirable defects in human beings, the difference is obvious from the definitions.
While birth defects can be caused by genetic factors, environmental hazardsâsuch as drugs and toxinsâcan also have a teratogenic effect. A teratogen is any substance to which a pregnant female is exposed that may cause physical defects in the developing embryo or fetus and result in a birth defect. If a woman is exposed to teratogens during pregnancy due to the negligence or wrongdoing of another party, that party can be held liable for the losses and suffering that ensues for both the mother and the child.