Acetaminophen is effective in reducing pain and fever.
It is indicated in adults and adolescents from 12 years of age for symptomatic relief of mild or moderate occasional pain, such as headache, dental, muscle (contractures) or back (lumbago), as well as in febrile states.
You should see a doctor if it gets worse or if fever persists after 3 days of treatment or pain for 5 days.