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].
In genetics, a mutagen is a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level. As many mutations can cause cancer, mutagens are therefore also likely to be carcinogens, although not always necessarily so. Some chemicals only become mutagenic through cellular processes. Not all mutations are caused by mutagens: so-called spontaneous mutations occur due to spontaneous hydrolys
carcinogen noun [C]. âº a âsubstance that âcauses âcancer: The American âgovernment âclassifies both âasbestos and âenvironmental âtobacco âsmoke as âclass one carcinogens. (Definition of carcinogen from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press).