The safety of taking Panadol, which is a brand name of acetaminophen, in the oral or rectal forms while pregnant hasn't been established by the U.S. Food and Drug Administration, according to Drugs.com. The intravenous form of acetaminophen is classified by the FDA as a Category C drug for pregnant women, which means that while studies haven't proven the safety in humans, the benefits of the drug sometimes outweigh the potential risks.
While acetaminophen is the most common pain reliever used by pregnant women, WebMD notes that studies suggest the drug might contribute to the development of attention deficit hyperactivity disorder as the child grows. Epidemiological data suggests that there isn't an increased risk of significant congenital malformation. Despite this suggestion, pregnant women should only take Panadol with the consent of their doctor or midwife.