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.
An agent known to cause cancer; a cancer-producing substance. carcinogenic-a carcinogen is a chemical known or believed to cause cancer in mammals.Some chemicals are proven carcinogens, but many more are suspected to be carcinogenic. carcinogenic-a substance that has the capability of causing cancer. carcinogen is any chemical known to cause cancer, there are a great many number of items known to have carcinogens present in them. Examples include paint, cigaretes, and mo â¦ re.