Amoxicillin is a prescription drug for short-term treatment of certain bacterial infections. Learn about side effects, interactions, warnings, dosage, and more. Amoxicillin is used to treat bacterial infections in many different parts of the body (ear, lungs, nose, sinus, skin, urinary tract). It is also used with other medicines (eg, clarithromycin, lansoprazole) to treat H. pylori infection and duodenal ulcers. Learn about side effects, dosage, uses, and more for amoxicillin, a prescription drug that treats bacterial infections in adults and children. Amoxicillin is a penicillin antibiotic used to treat bacterial infections such as tonsillitis, bronchitis, sinusitis, pneumonia, and infections of the ear, nose, throat, skin, or urinary tract. Find patient medical information for Amoxicillin (Amoxil and others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Detailed Amoxicillin dosage information for adults and children. Includes dosages for Urinary Tract Infection, Sinusitis, Bronchitis and more; plus renal, liver and dialysis adjustments. Amoxicillin is an antibiotic medication belonging to the aminopenicillin class of the penicillin family. The drug is used to treat bacterial infections [9] such as middle ear infection, strep throat, pneumonia, skin infections, odontogenic infections, and urinary tract infections. [9].