Millions use Tylenol on a daily basis without concern, but it has a wide range of toxic side effects you should be aware of, especially if you are pregnant or use it with your children. A number of non-peer-reviewed articles have been written and published on the web claiming that there is literally nothing to fear from acetaminophen during pregnancy. There are two types of articles that fall into this category. First, reputable watchdog organizations have weighed in on the issue, declaring acetaminophen use during pregnancy and during childhood to be proven safe. In particular, the National Health Service of the UK and the Center for Accountability in Science have both strongly criticized the Spanish study from 2016 showing a link between acetaminophen use during pregnancy and ADHD/autism.