What country are opioid painkillers legal to buy?

Opioid painkillers are legal to buy in many countries, including the United States, Canada, Australia, and several European nations, but they are regulated substances. In these countries, prescriptions from licensed healthcare providers are typically required to obtain opioids legally. However, the regulations can vary significantly, with some countries implementing stricter controls to combat opioid misuse and addiction. Always check local laws and regulations for specific guidelines regarding opioid prescriptions and purchases.