Amoxicillin
"Starts to work after the first dose. I have taken this for ear infections as well as sinus and chest infections and it is always very effective. Symptoms start to ease in around 12 hrs and are almost completely gone with 48 to 72 hrs. Always finish your entire prescription though to help avoid antibiotic resistant bacteria and to stop the infection from returning. Only downfall is that it can upset your stomach so always take it with food. Depending on your condition, you might need to use other medications or remedies along with amoxicillin to ease other symptoms. Some pharmacies offer this on their $4 prescription plans."