The US FDA has assigned the pregnancy category B status to Benadryl, which means that it is considered safe to use, as there are no known side effects. However, your doctor will be the best person to judge whether or not you should take Benadryl while you are pregnant. He will also decide on the quantity of intake.
Human carcinogen -- Benzene: Benzene is a chemical deemed to be carcinogenic to humans. The carcinogenicity of the substance may be influenced by the nature (e.g. inhalation, ingestion, skin contact), duration and level of exposure. Benzene exposure is associated mainly with an increased risk of developing leukemia or lymphoma.
Benzo[a]pyrene is a polycyclic aromatic hydrocarbon found in coal tar with the formula C 20 H 12. Its metabolites are mutagenic and highly carcinogenic, and it is listed as a Group 1 carcinogen by the IARC.The compound is one of the benzopyrenes, formed by a benzene ring fused to pyrene, and is the result of incomplete combustion at temperatures between 300 Â°C (572 Â°F) and 600 Â°C (1,112 Â°F).roperly speaking, benzo[ a ]pyrene is a procarcinogen, meaning that the mechanism of carcinogenesis of benzo[ a ]pyrene depends on enzymatic metabolism of benzo[ a ]pyrene to the ultimate mutagen, benzo[ a ]pyrene diol epoxide, pictured above at right.