Antibiotics start working immediately. There job is to kill the bacteria, not take away your symptoms. When the bacteria is gone your symptoms will ease up, but your throat is sore and that's going to take a few days to heal. Your dr should give you something for your throat.
Sometimes one certain antibiotic won't work for some people. I've had a strep throat got worse while on antibiotic. Call the doctor, he may want to try something else that works better for you. That's what my doctor did.
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