St Johns wort Hypericum perforatum Jennifer Anderson Usdanrcs Plants Database

side effects. The active constituents in the plant (there are over fifty) include antraquinones (hypericin and pseudohypericin), prenylated phloroglucinol derivatives (hyperforin), and flavonoids.

However, the side effects of St. John's wort include stomach complaints, fatigue, and especially allergic reactions (photodermatitis). Most authorities warn strongly that Hypericum extracts should not be taken alongside other anti-depressants; doing so can result in a syndrome called serotonin syndrome.

See: Ornamentals, p. 282

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