How long does it take tylenol to start working?

Also known as acetaminophen, Tylenol will start to work 30 minutes after it is taken. This drug can start reducing fever within 2 hours of taking it, as stated by Children's Health Network.

Tylenol is recommended for children above the age of 3. The medication should be used as directed by a doctor. An overdose of Tylenol can cause liver damage or even lead to death. Dosage is given according to the weight of a child after every 4 to 6 hours. The drug should treat fever after three days, as stated on the Drugs website. If not, one should seek medical attention.