My son is on day 4 of amoxicillin for strep. fever is gone but he can hardly swollen without crying in pain. is it typical?

No: His throat pain should be gone. Have his throat looked at again to make sure it is resolving. All the best.

Maybe: Strep verified by testing ? If so, Amoxicillin is an effective treatment when given in proper amounts. The response varies with the patient and co-factors. Kids can have a throat infection virus and carry strep at the same time. This slows improvement.Time delay before treatment also means there will be a slower response. The lack of fever is a good sign.I'd call your docs office for guidance