Dihydrocodeine
Dihydrocodeine (4,5-alpha-epoxy-3-methoxy-17-morphinan-6-ol, C18H23NO3), also called DHC or DF-118, is a synthetic opioid analgesic prescribed for postoperative pain, severe dyspnea, or as an antitussive. It is similar in chemical structure and effects to codeine, and is approximately twice as potent. As with other opioids, tolerance and physical and psychological dependence develop with repeated use.
In the USA, it is a DEA Schedule II substance, although preparations containing small amounts of dihydrocodeine are classified as Schedule III or Schedule V, depending on the concentration of dihydrocodeine relative to other active constituents, such as acetaminophen.
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