Amoxicillin is a popular antibiotic (penicillin), that cures bacterial infections like ulcers, chest pain, ear infections, etc. Amoxicillin 500 mg is recommended for patients weighing more than 40kg. This medication is prescribed for patients with unbearable stomach pain and it is taken at an interval of 12 hours a day i.e. twice. Before using this drug always consult with the doctor.