Very few drugs have been studied in pregnancy so it is always best to check with a doctor or pharmacist. This website, MotherToBaby, from The United States, has factsheets for parents that answer frequently asked questions about exposures during pregnancy and breastfeeding.

As a general rule it is okay to take the occasional Tylenol (acetaminophen) but use Advil (ibuprofen) with caution and not after 30 weeks.