The availability of prescription-only analgesics purchased from the internet in the UK.

What Is Already Known About This Subject: Increasing numbers of people are accessing medicines from the internet. This online market is poorly regulated and represents a potential threat to the health of patients and members of the public.

What This Study Adds: Prescription-only analgesics, including controlled opioids, are readily available to the UK public through internet pharmacies that are easily identified by popular search engines.