<unk> , sold under the brand name Penthrox among others, is an inhaled medication primarily used to reduce pain following trauma. It may also be used for short episodes of pain as a result of medical procedures. Onset of pain relief is rapid and of a short duration. Use is only recommended with direct medical supervision. Common side effects include anxiety, headache, sleepiness, cough, and nausea. Serious side effects may include kidney problems, liver problems, low blood pressure, and malignant hyperthermia. It is unclear if it is safe in either pregnancy or breastfeeding. It is only recommended in those who have a normal level of consciousness and stable blood pressure and heart rate. It is classified as a volatile anaesthetic. It was first made in 1948 by William T. Miller and came into medical use in the 1960s. It was used as a general anesthetic from its introduction in 1960 until the late 1970s. In 1999, the manufacturer discontinued<unk>  in the United States, and in 2005 the Food and Drug Administration withdrew it from the market. It is still used in New Zealand, Australia, Ireland, and the United Kingdom for pain.
Methoxyflurane
Isoflurane
Desflurane
Halothane
Sevoflurane
Etomidate
Methitural
Methacholine