My 2 yr old has bronchitis and is on an antibiotic. He is so uncomfortable. can i give him some tylenol or mo?

I am surprised that your physician did not give you instructions for handling this ... it is not unusual to give tylenol for children in the treatment of bronchitis ... call your physician for dosing ... and see if they think it is a good idea ... my physicians commonly prescribe this for pain due to persistent coughing