Rotundine Caseanine: Natural Isoquinoline Alkaloid from Sinomenium and Corydalis with Analgesic and Neuroprotective Benefits

1. Description

Rotundine, also known as Cranial Pain Reliever or Levotetraspam, has the chemical name 2,3,9,10-tetramethoxy-5,8,13,13a-tetrahydro-6H-dibenz [a,g]quinoline. It is the levorotatory isomer of Corydaline (dl-THP) and acts as a dopamine receptor antagonist in the brain. It preferentially blocks dopamine receptors in brain regions rich in these receptors, such as the cortex and striatum, and exerts its analgesic effect by enhancing the function of the endogenous pain-inhibitory system and suppressing the transmission of pain signals to the central nervous system. Its analgesic effect is weaker than that of pethidine but stronger than that of general analgesics. At therapeutic doses, it does not cause respiratory depression or gastrointestinal smooth muscle spasm, and is effective for acute and chronic persistent pain as well as visceral dull pain. First launched in China in 1985, it is indicated for patients with insomnia caused by pain, as well as for pain associated with gastric and duodenal ulcers, dysmenorrhea, postpartum uterine contractions, tension-type insomnia, and spasmodic cough.

2. Application

(1) Clinical analgesic studies: Used to treat visceral pain caused by gastrointestinal disorders, such as pain from gastric and duodenal ulcers; also used for general headaches, menstrual cramps, and postpartum uterine contractions.

(2) Sedative and hypnotic studies: Used in studies on sedation and hypnotic effects in patients with tension-type pain or insomnia caused by pain.

(3) Research Applications: Used as an analytical standard for research purposes such as quantitative analysis, pharmacological experiments, and bioactivity screening.

3. Main Efficacy

(1) Analgesic effects: It possesses analgesic activity and is particularly effective for chronic persistent pain and visceral dull pain. Its mechanism of action may be related to the inhibition of the ascending reticular activating system in the brainstem and the blockade of dopamine receptors in the brain.

(2) Sedative and Hypnotic Effects: While providing analgesia, it also induces sedation and sleep, making it particularly suitable for cases of insomnia caused by pain. At therapeutic doses, it does not cause respiratory depression.

(3) Non-Addictive: At therapeutic doses, it is non-addictive and does not cause gastrointestinal smooth muscle spasm.