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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for his symptoms.Antibiotic can take sometime to act.It can take 2-3 days to have full effect.You can wait for a day.If the fever still runs high, I would advise to take a review by doctor.Antibiotic may not be working or there is resistance to it.You can give ibuprofen & acetaminophen. Ibuprofen can be repeated 3 -4 times, it can be given 6-8 hourly.Acetaminophen can be given 4-6 hourly but not to exceed 5 doses.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish his healthy life.Regards.