Codeine-containing painkillers may soon no longer be available over the counter in Australian pharmacies. Philippa Willitts/Flickr April 30, 2015 Why making codeine products prescription‑only is a good idea Jennifer Pilgrim, Monash University Australia’s drug regulator is looking into reclassifying codeine-based drugs as prescription-only. This is a good idea because the easy availability of these pinkillers is causing substantial harm.