St. john's wort Side Effects

Applies to st. john's wort: oral capsule, oral tablet.

Many drugs can interact with St. John's wort, and serious drug interactions can occur when certain medicines are used at the same time. Do not take St. John's wort without medical advice if you regularly use other medicines.

Avoid exposure to sunlight while taking St. John's wort. This product can make you sunburn more easily.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Although not all side effects are known, St. John's wort is thought to be likely safe when taken by an adult for up to 12 weeks, or by a child age 6-17 for up to 8 weeks. St. John's wort may be unsafe when taken in large doses.

Stop using St. John's wort and call your healthcare provider at once if you have:

severe skin rash or irritation;
severe sunburn (redness, burning, blistering) after being outdoors; or
(if you are also taking an antidepressant or narcotic pain medicine) -- agitation, hallucinations, fever, fast heart rate, overactive reflexes, nausea, vomiting, diarrhea, loss of coordination, fainting.

Common side effects may include: