T.F.
You need to know how high the fever is before you give over the counter medicine. Even though the site below is the mayoclinic's website you should ask your pediatrician for advice for this instance and the future. Also research Tylenol and liver damage. It definitely has it's place but should be used when you need it, not when you don't. He may also get a fever for a short period of time and recover. That is how his body fights off illness. Again, check with your doctor on this.
http://www.mayoclinic.com/health/fever/ID00052