As per a paper by the University of Michigan, the following medicines are not considered safe for pregnancy-
● Bismuth subsalicylate (such as Pepto-Bismol).
● Phenylephrine or pseudoephedrine
● Cough and cold medicines that contain guaifenesin
● Pain medicines like aspirin and ibuprofen (such as Advil and Motrin) and naproxen (such as Aleve).