Several painkillers have been banned or are subject to bans in various countries, depending on factors like safety concerns, potential for abuse, and adverse effects. There is no single universally banned painkiller.
Examples of Banned or Restricted Painkillers:
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Tramadol: Tramadol, an opioid-based painkiller, has been banned in specific contexts. For example, the government banned a combination of Paracetamol, Tramadol, Taurine, and Caffeine. Additionally, Tramadol is on the World Anti-Doping Agency's (WADA) banned list due to evidence of abuse among athletes. [Source: Government ban on Paracetamol, Tramadol, Taurine and Caffeine combination; WADA's ban on Tramadol].
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Metamizole (Nolotil): This painkiller is banned in several countries, including the UK, due to its link to agranulocytosis, a potentially life-threatening condition affecting white blood cell production. [Source: The Guardian article linking Metamizole to deaths].
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Percocet and Vicodin: A federal advisory panel recommended a ban on these opioid painkillers in 2009 due to concerns about liver damage. [Source: The New York Times article on the recommended ban].
Important Note: The legality and availability of specific painkillers vary significantly depending on the country and its regulations. Many common over-the-counter medications in one country might be illegal in another. [Source: US Embassy Japan page on importing medication]. The information above highlights examples of painkillers with restrictions, not an exhaustive list of every banned painkiller worldwide.