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There are insufficient data available at this time to recommend use of St. John’s wort by
children or during pregnancy or breast-feeding.
The list of all of the many observed side effects of St. John’s wort includes:
sensitivity to sunlight (danger of severe sunburn), rare, under 1% risk, and generally
in light-skinned people or with use of antibiotics or birth control pills. Nonetheless,
persons using St. John’s wort should use sunscreen and other protection outdoors.
gastrointestinal symptoms including nausea, loose stools, constipation and
heartburn/gastric upset. Persons using St. John’s wort should take it with food.
anxiety
dry mouth
dizziness
fatigue/sedation
headache
sexual dysfunction/disinterest (including impotence)
confusion
insomnia
bruxism (teeth clenching)
vivid dreams
restless legs
tingling
suicidal and homicidal thoughts. Mischoulon and Rosenbaum report 17 cases of
psychosis, but lesser disturbance is difficult to quantify. If these thoughts persist,
get help.
- DOSAGE: The typical dose for mild to moderate depression is 900 mg per day standardized
to contain 0.3% hypericin or hyperforin and split in three dosages. Brown et al. note that
treating severe depression may require doses of up to 1,800 mg. per day for 6-12 weeks.
At these higher doses, Saint John’s wort causes more side effects, similar to Zoloft and
increases the risk of interactions with medications. This is twice the dosage used in most