Methoxyflurane Hydrogenated ether (ether with one or more hydrogen atoms replaced with a halogen atom). It is a powerful analgesic although is also a respiratory depressant. The use of Penthrane foreshadowed the patient controlled analgesia devices.Empty brown glass bottle with green manufacturer's label, with white writing and a white plastic lid. Green liquid measures have been printed on the side of the bottle.White sticker stuck to manufacturer's label: Expiration Date / Feb. 1, 1976 / Lot 854-1663analgesia, hydrogenated ether, self administration, methoxyflurane, abbott laboratories, penthrane