If you have allergies, pregnancy can make your symptoms worse. But you're right to worry about taking allergy medicine during pregnancy. Pregnant women shouldn't take some allergy drugs. Certain antihistamines, however, are safe.
free radical. (chemistry). An atom or a diatomic or polyatomic molecule which possesses one unpaired electron. Also known as a radical.ree radical. in chemistry, a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable.
The research in radical behaviorism is called the experimental analysis of behavior and the application of this field is called applied behavior analysis (ABA).adical behaviorism as a natural science [edit]. The most precise way to describe radical behaviorism as radical is to understand that instances such as evolution and cell division are occurrences that just happen.