Each medicine has an approved name called the generic name. A group of medicines that have similar actions often have similar-sounding generic names. For example, phenoxymethylpenicillin, ampicillin, amoxicillin and flucloxacillin are in one group of antibiotics.
This is a companion discussion topic for the original article at https://patient.info/treatment-medication/medicines-to-keep-at-home/generic-vs-brand-name-medicines