St. Johnswort | definition of St. Johnswort by Medical dictionary
St John's wort (redirected from St. Johnswort)
Also found in: Dictionary
St John's wort Hypericum perforatum Herbal medicine A perennial herb that contains flavonoids, glycosides, mucilage, tannins, volatile oil; it is antibacterial, anti-inflammatory, antimicrobial, astringent, expectorant, sedative; as an antidepressant, it is overrated, proving ineffective in double-blinded placebo-controlled trials Toxicology SJW may interfere with OCs, anti-HIV agents, transplant drugs, anti-depressants; it causes HTN, headaches, N&V; it may also interact with amphetamines, amino acids–tryptophan, tyrosine, antiasthmatic inhalants, beer, wine, chocolate, coffee, fava beans, cold and hay fever agents, narcotics, nasal decongestants, smoked or pickled foods. See Herbal medicine.