The hepatotoxicity of halothane is now well known, but only became apparent after several years of use. The nephrotoxicity of methoxyflurane was not realized immediately, but once identified, led to its withdrawal from use. Therefore, when new agents that appear to offer significant advantages over established drugs become available, exhaustive testing and monitoring is necessary to ensure their safety. Sevoflurane, recently available in the UK and the USA but used for some time in Japan, has been subjected to considerable scrutiny.
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