I was diagnosed with a sinus and ear infection Friday. I started taking antibiotics on Friday morning but today, Saturday night, I am not feeling any better. My right ear is hurting a lot. I feel sharp pain and throbbing in my ear.How long does it take for antibiotics to start working?

It will take a few days (2-3 days) and it's best to continue the whole course of antibiotics! You may have a severe infection so it may take longer to clear up!! Just make sure you continue taking your antibiotics at the correct time and if in 2-3 days from today you still don't feel better go see your doctor or pharmacist!!