I know! Even down to panadol vs panamax. I feel for people like my IL's who don't speak ENglish and always just get what the Dr says.
And old people my pharmacist was telling me when I was pregnant (and getting some vitamin d supps) that he sees the dame scripts come in all the time, for a really expensive vit d, and all the old people refuse to get anything other than what their doctor wrote down, so they end up spending half their pension on brand name medications.