Amoxicillin 500 mg capsules is a beta-lactam medication that is prescribed to treat various types of infections caused by gram-positive bacteria. It is part of the group of drugs known as antibiotics. Amoxicillin belongs to a class of medication known as penicillin. The chemical name of amoxicillin trihydrate is amino benzylpenicillin. This broad-spectrum antibiotic occurs as a white crystalline powder. The chemical formula of this antibiotic is C16H19N3O5S. It treats only bacterial infections. This doesn’t work for viral infections (such as the common cold, cough, or flu). This medication is available in generic and brand forms.