What is Sinomenine Hydrochloride?

Sinomenine Hydrochloride or Cocculine is an alkaloid found in the root of the climbing plant Sinomenium acutum which is native to Japan and China. It is traditionally used in herbal medicine in these countries, as a treatment for rheumatism and arthritis.However its analgesic action against other kinds of pain is limited. Sinomenine is a morphinan derivative, related to opioids such as levorphanol and the non-opioid cough suppressant dextromethorphan. Its anti-rheumatic effects are thought to be primarily mediated via release of histamine,but other effects such as inhibition of prostaglandin, leukotriene and nitric oxide synthesis may also be involved.

Physical and chemical properties

Needle crystals (benzene), melting point 161°C. After melting, the melting point rose to 182°C. [α]26D-71°(c=2.1, ethanol), soluble in ethanol, acetone, chloroform and dilute alkali, slightly soluble in water, ether and benzene.

Function and application of Sinomenine Hydrochloride

Analgesic effect

Sedation