Mitragyna alkaloids

Mitragynine is an indole-based alkaloid and is one of the main psychoactive constituents in the Southeast Asian plant Mitragyna speciosa, commonly known as kratom. It has also been researched for its use to potentially manage symptoms of opioid withdrawal. It is a partial agonist of the mu-opioid receptors; and as such can produce effects similar to those of classical opioids such as morphine.

Ajmalicine, also known as δ-yohimbine or raubasine, is an antihypertensive drug used in the treatment of high blood pressure. It has been marketed under numerous brand names including Card-Lamuran, Circolene, Cristanyl, Duxil, Duxor, Hydroxysarpon, Iskedyl, Isosarpan, Isquebral, Lamuran, Melanex, Raunatin, Saltucin Co, Salvalion, and Sarpan. It is an alkaloid found naturally in various plants such as Rauvolfia spp., Catharanthus roseus, and Mitragyna speciosa.

7-Hydroxymitragynine (7-OH-MIT, often simply referred to as 7-OH) is a terpenoid indole alkaloid present in the plant Mitragyna speciosa (the leaves of which are commonly known as kratom). It was first described in 1994. In humans, it is produced as an active metabolite of mitragynine via hepatic oxidation.

Rhynchophylline is an alkaloid found in certain Uncaria species (Rubiaceae), notably Uncaria rhynchophylla and Uncaria tomentosa. It also occurs in the leaves of Mitragyna speciosa (kratom) and Mitragyna tubulosa, a tree native to Thailand. Chemically, it is related to the alkaloid mitragynine.

Mitraphylline, an oxindole derivative, is an active alkaloid in the leaves of the tree Mitragyna speciosa, commonly known as kratom. As a non-narcotic constituent, it also occurs in the bark of Uncaria tomentosa (cat's claw) along with isomeric alkaloids.