| vinca alkaloids | <chemical> A class of alkaloids from the genus of apocyanaceous woody herbs including periwinkles. They are some of the most useful antineoplastic agent. Pharmacological action: antineoplastic agent, phytogenic, vasodilator agents. (12 Dec 1998) |
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| cinchona alkaloids | Alkaloids extracted from various species of cinchona. (12 Dec 1998) |
| salsoline alkaloids | Tetrahydroisoquinolinol alkaloids in both dextro and levo forms, originally from salsola richteri; may be hypotensive due to inhibition of certain brain enzymes; may be formed de novo in brain from dopamine during alcoholism. (12 Dec 1998) |
| xanthine alkaloids | Alkaloids, which contain xanthine as their nitrogenous base. (12 Dec 1998) |
| pyrrolizidine alkaloids | <chemical> Alkaloids found in various species of senecio and other plants. There are at least ten different chemicals, many of them hepatotoxic, teratogenic, and carcinogenic. The plants may cause damage in grazing herds, but no longer have medical use. Pharmacological action: carcinogens. (12 Dec 1998) |
| solanaceous alkaloids | Alkaloids, mainly tropanes, elaborated by plants of the family solanaceae, including atropa, hyoscyamus, mandragora, nicotiana, solanum, etc. Some act as cholinergic antagonists; most are very toxic; many are used medicinally. (12 Dec 1998) |
| ergot alkaloids | Alkaloids isolated from the ergot fungus claviceps purpurea (hypocreaceae). The ergot alkaloids were the first alpha-adrenergic antagonists discovered, but side effects generally prevent their administration in doses that would produce more than a minimal blockade in humans. Their smooth muscle-stimulating activities may be attributed to alpha-agonistic properties, thus characterizing these alkaloids as a series of partial agonists. They have many clinical applications, notably in obstetrics and the treatment of migraine. (12 Dec 1998) |