Amoxicillin, and the branded version Amoxil, are oral antibiotic medications similar to penicillin. Amoxicillin is a semisynthetic antibiotic with a bactericidal effect against both gram-negative and gram-positive organisms. Amoxil may be used to treat specific types of infections of the ear, nose and throat, genitourinary tract, skin and lower respiratory tract. Amoxicillin is absorbed quickly after being ingested orally and is mostly excreted in the urine unchanged. Amoxicillin has a half-life of 61 minutes and roughly 20% of it is bound by proteins in the blood. Peak amoxicillin levels occur between 1 and 2 hours after administration. Amoxil capsules contain amoxicillin 500 mg and are royal blue and pink in color. Amoxil tablets contain amoxicillin 500 mg or amoxicillin 875 mg. Amoxil is also available as chewable tablets and powdered oral suspensions. Amoxicillin is also combined with another drug and used as Augmentin.