Hello dear I understand your concern Amoxicillin is antibiotic, it is prescription drug and should be done after confirming the infection. It could be symptoms of viral infection or some bacterial or parasitic infection which should be ruled out by complete physical examination with some relevant tests. I would suggest you to undergo routine blood counts with differential counts and blood test to rule out malaria, any other pathogen predominant in your region . Treatment will depend on the tests result Drugs like advil should be started to reduce the temperature Give him lots of fluid to drink. Other treatment will depend on the other associated symptoms after detailed examination. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar