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Strictosidinic acid, an orally active glycoside indole monoterpene alkaloid isolated from Psychotria myriantha leaves, inhibits precursor enzymes of 5-HT biosynthesis and reduces the 5-HT levels. Strictosidinic acid has peripheral analgesic and antipyretic activities in mice[1][2].

Strictosidinic acid (20 μg/μl; intra-hippocampal injection) causes a significance of 83.5% reduction in 5-HT levels. Strictosidinic acid (10 mg/kg; i.p.) causes a 63.4% reduction in 5-HT levels and a 67.4% reduction in DOPAC values in male Wistar rats, weighing 200-250 g[1].

[1]. F M Farias, et al. Strictosidinic Acid, Isolated From Psychotria Myriantha Mull. Arg. (Rubiaceae), Decreases Serotonin Levels in Rat Hippocampus. Fitoterapia. 2012 Sep;83(6):1138-43. [2]. F M Farias, et al. Monoamine Levels in Rat Striatum After Acute Intraperitoneal Injection of Strictosidinic Acid Isolated From Psychotria Myriantha Mull. Arg. (Rubiaceae). Phytomedicine. 2010 Mar;17(3-4):289-91.

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