In May 2015, we looked at pharmaceutical websites for a range of oral painkillers [for oral administration] that are available in the UK www.rxonpharm.com without a doctor's prescription. We also viewed websites in Australia, Canada and the USA. We then conducted a search for Cochrane reviews reporting how well these pain killers work and any side effects. We used high-quality evidence from 10 Cochrane reviews with the addition of information from one non-Cochrane analysis.