Hi thanks for your question
Myalgia,fever with chills and sore throat
are all symptoms of upper respiratory tract
infection most probably pharyngitis
.This could be a part of flu.
Tylenol which is acetaminophen
and ibuprofen are ok for control of fever,chills and myalgia,but he may need a consultation with a physicion who may have a look into his throat to acess the degree of pharyngitis he is having,.accordingly he/she may also prescribe him antibiotic along with other drugs needed.
Hope this answers your question.