Sevoflurane (2, 2, 2-trifluoro-1-(trifluoromethyl) ethyl ether), also called fluoromethyl, is a halogenated ether used for induction and maintenance of general anesthesia. Together with desflurane, it is replacing isoflurane and halothane in modern anesthesiology. It is often administered in nitrous oxide and pure oxygen. After desflurane it is the volatile anesthetic with the fastest onset and offset.