New research has found that teens from around the world are twice as likely to have asthma if they take acetaminophen, best known as Tylenol on a regular basis. Taking acetaminophen has also been linked to eczema and allergic nasal congestion in adolescents. The research was carried out by asking teens after the fact how often they took acetaminophen and if they suffered from asthma or eczema. Therefore the researchers could not claim that acetaminophen caused asthma or eczema.