Hi<br/><br/>Would you say that it's AmE VS BrE? If yes, how would a native speaker of BrE find the second sentence? Odd? OK?<br/><br/>Antibiotics are only available <b>on prescription.</b> (BrE)<br/>Antibiotics are only available <b>by prescription</b>. (AmE)<br/><br/><br/>Thanks,<br/><br/><br/>Tom